BRUEL & KJAER/BRUEL KJAER 2238 Basic SLM Software
User Manual: BRUEL & KJAER/BRUEL & KJAER 2238 Basic SLM Software
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Technical
Documentation
2238 Mediator
Integrating Sound Level Meter
Basic SLM Software BZ 7126
English BB1119 – 11
2238 Mediator
Integrating Sound Level Meter
Basic SLM Software BZ 7126
February 1999
Brüel & Kjær
BB1119 – 11
Trademarks
2238 Mediator is a trademark of Brüel & Kjær A/S. Microsoft, Windows, and MS-DOS are trademarks of Microsoft Corporation.
Copyright © 1998, Brüel & Kjær Sound & Vibration Measurement A/S
All rights reserved. No part of this publication may be reproduced or
distributed in any form, or by any means, without prior consent in writing from Brüel & Kjær Sound & Vibration Measurement A/S, Nærum,
Denmark.
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2238 Mediator
User Manual
Brüel & Kjær
Contents
Introduction
About this manual and the 2238 Mediator.
measurement parameters, menus and navigation
Overview
of
Getting Started
Basic introduction to the Mediator: Fitting batteries, pushkey
definitions, Measurement Window and changing the language
The System Menu
The Measurement Set-up Menu
Explains how to set up parameters in the Measurement Set-up menu
Measuring
Explains how to perform simple measurements: Calibrating,
starting a new measurement, measurement control and changing
the displayed measurement parameters
Data Handling
Explains how the data file system works: Storing, recalling, printing
and deleting data
Printing and Transferring Data
Explains how to export data to a PC and post-processing programs,
how to set up a printer
Maintenance and Repair
4
5
6
7
8
Service, repair, care, cleaning and storage of the Mediator
2238 Mediator
User Manual
2
3
Explains how to set up parameters in the System menu
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1
0–5
Specifications
9
Specifications for the Mediator
10
11
12
Appendix 1: General
Information about: Exchange Rate, listing of default parameters and
interface error messages
Appendix 2: Interface
Explains the programming and operation of the serial interface for
the Mediator: Formats for interface messages, setting up the PC and
interface jobs
Index
0–6
2238 Mediator
User Manual
Brüel & Kjær
Chapter 1
Introduction
1.1
About this Manual ..............................................................
1– 2
Summary of Contents........................................................ 1 – 2
About this Volume ............................................................. 1 – 3
1.2
About the 2238 Mediator .................................................
1– 4
How the Mediator Works .................................................. 1 – 5
Application Programs........................................................ 1 – 5
1.3
Measurement Parameters ...............................................
1– 7
1.4
Menu Structure ..................................................................
1 – 10
Navigation........................................................................
System Menu ...................................................................
Measurement Set-up Menu ............................................
Calibration Menu ............................................................
File System ......................................................................
1 – 10
1 – 11
1 – 11
1 – 12
1 – 12
Backlight ...............................................................................
1 – 14
1.5
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2238 Mediator
User Manual
1–1
Chapter 1 – Introduction
About this Manual
1.1
About this Manual
1.1.1
Summary of Contents
1–2
●
Chapter 1 – Introduction: provides a general overview
of the Mediator and its functions.
●
Chapter 2 – Getting Started: provides basic information including: replacing batteries, using the pushkeys,
reading the screen, and setting the language.
●
Chapter 3 – System Menu: provides an overview of the
System menu and gives instructions for setting up the
parameters.
●
Chapter 4 – Measurements Set-up Menu: provides an
overview of the Measurement Set-up menu and gives
instructions for setting up the measurement parameters.
●
Chapter 5 – Measuring: gives instructions for calibrating the Mediator and for checking the calibration and the
calibration history. It provides information about starting
a new measurement.
●
Chapter 6 – Data Handling: contains information and
instructions about using the file managing system.
●
Chapter 7 – Printing and Transferring Data: provides information about outputting data to a printer or
a PC and setting up the output connectors.
●
Chapter 8 – Maintenance and Repair: gives information about care, cleaning and storage and contains service
and repair information.
●
Chapter 9 – Specifications: – technical specifications.
●
Appendix 1: General: – describes the exchange rate
parameter and lists the default parameters and interface
error messages.
●
Appendix 2: Interface: – gives a general description of
the terminology for the interface messages and instructions for using the interface commands and queries
●
Index
2238 Mediator
User Manual
Brüel & Kjær
Chapter 1 – Introduction
About this Manual
1.1.2
About this Volume
This volume of the User Manual deals with all the general
aspects of handling and setting up the Mediator and includes
instructions for the functionality of the Basic version (Basic
SLM Software BZ 7126). If your Mediator has been upgraded
to other version(s), you must refer to the associated User
Manual(s) for the special functions related to these software
versions.
Conventions Used in this Manual
Pushkeys
References to buttons on the 2238 Mediator are shown with
the pushkey’s pictogram as it appears on the instrument (for
example
). Refer to section 2.3 for a complete list of button
pictograms and their functions.
Soft Keys
Mediator has two “soft keys” that have different functions
depending on the current context. The soft keys functions are
denoted by chevrons (<>) and courier type face. The current
functions of the soft keys are always shown on the display.
The
soft key can have the following functions: ,
, or . The
soft key can have functions: , or . This is similar to
the functionality from the familiar Windows environment.
Parameter Text
Text which refers directly to text on the instrument’s screen
or printouts is indicated using a Courier type face.
For example: Press
System menu.
until Language is highlighted in the
Sockets
Reference to sockets is made in bold type face (for example,
Aux 1)
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Chapter 1 – Introduction
About the 2238 Mediator
1.2
About the 2238 Mediator
Standards
2238 Mediator Integrating Sound Level Meter complies with
the coming IEC 1672 Class 1 standard. This standard will
supersede the IEC 651 and IEC 804 Type 1 standards. This
implies that the Mediator also complies with current international and national standards. The Mediator is categorized
as a Group X sound level meter according to IEC 1672, i.e. a
self-contained battery-operated instrument that requires no
external connections to other apparatus to measure sound
levels.
Basic Configuration
The Mediator comprises the following:
●
2238 Mediator Integrating Sound Level Meter
●
Basic SLM Software BZ 7126
●
Microphone Preamplifier ZC 0030
●
1.2.1
Prepolarized free-field 1/2″ Condenser Microphone Type
4188
●
9-pole cable with 25-pole Adaptor AO 1386 (null-modem
cable for serial interface)
●
Shoulder Bag KE 0323
●
Protective Cover UA 1236
●
4 × Alkaline Batteries QB 0013
How Mediator Works
The Mediator can be configured to a wide range of requirements with different software packages or a combination of
these packages. You can easily upgrade the software via the
serial RS – 232 interface or it can be performed at a
Brüel & Kjær service centre. The Frequency Analysis Software option requires Type 2238 – A – F (with filter set) or a
hardware upgrade (installation of filter set 2238 MUF), that
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User Manual
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Chapter 1 – Introduction
About the 2238 Mediator
must be made at a Brüel & Kjær service centre. If the Mediator is ordered with Frequency Analysis Software BZ 7123,
the filter set is part of the instrument.
Refer to the block diagram in Fig.1.1 for an overview of how
the Mediator works. The signal from the microphone is fed
through the appropriate amplifiers, the desired filters (“A”,
“C”, “L” or octave filters (if fitted)) and correction filters
(“Sound Incidence”, “Windscreen”). The multiplexer switches
two signals (either the same signal or with different weightings) through to the RMS and the RMS/Peak detectors and
succeeding Time Weighting filters. At this point the signals
are still in the analogue domain. The signals are now converted in the D/A-converter and all subsequent signal processing is in the digital domain. Finally the signals are fed
through the D/A-converter and the buffered signals are output to the Aux 1 and Aux 2 connectors via the multiplexer.
Detectors
One of the main features of the Mediator is that it contains
two detectors with independent frequency weighting functions. In the basic package, one is an RMS detector and the
other a Peak detector. Linear and A- and C-weighting can be
selected for both detectors. F (Fast), S (Slow) and I (Impulse)
time weighting must be selected in the basic version. Both
frequency and time weightings must be selected before a
measurement is performed.
1.2.2
Application Programs
The following software modules are available for upgrading
the Mediator:
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●
Frequency Analysis Software BZ 7123 — general purpose
module for scanning 1/1- and 1/3-octave bands. BZ 7123
requires the 1/1-octave and 1/3-octave filter set (2238
MUF). If the Filter Set has already been installed, you
can order BZ 7123 alone. Refer to ordering information
in the associated Product Data sheet.
●
Logging SLM Software BZ 7124 — allows a large range
of parameters to be logged. This module allows logging
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User Manual
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Chapter 1 – Introduction
About the 2238 Mediator
External
power
supply
Microphone
Power supply
Preamplifier
Display
Amplifier
10 dB/step
(Cal. adjustment)
Keys
Batteries 6V
(4 x AA size)
Digital control
and processing
Serial
interface
Correction filter
(Sound Incidence,
Windscreen)
Time weighting1
RMS 1
RMS 23 PEAK AUX1/23
1/1- and 1/3-Octave
Filter Set
Peak/RMS2
detector
RMS
detector
Overload detector
MUX
A-filter
C-filter
Buffer
AC out
Buffer
DC out
Aux 1
Aux 2
MUX
L-filter
1
2
3
No time weighting with peak detector
Only peak detector in basic version
Not available in Basic Version
980091e
Fig.1.1 Simplified block diagram for 2238 Mediator
of all relevant parameters from Enhanced SLM Software
BZ 7125.
●
1–6
Enhanced SLM Software BZ 7125 — adds a number of
powerful features to the basic version. Including: statistics, back-erase function and the possibility of two simultaneous RMS measurements.
2238 Mediator
User Manual
Brüel & Kjær
Chapter 1 – Introduction
Measurement Parameters
Filter Set
The 1/1-octave and 1/3-octave filter set is required with the
frequency analysis module, but the filter set can be installed
and used with all modules. In this case the filter bands are
available as a frequency weighting that can be selected manually.
Changing Application
Push the
key to display the System menu from which
you can select the desired application module. Refer to section
4.1 in Chapter 3 for more details about the System menu.
1.3
Measurement Parameters
Table 1.1 lists the discrete parameters available with the
Basic package. The X and Y suffixes in the parameter names
refer respectively to frequency weightings (A, C or L) and
time weightings (S, F or I).
You can change the displayed parameters during measurement or in pause mode. Press the
key to enter set-up
mode and use the
and
keys to select (highlight) the
desired parameter in the Measurement Window. Use the
or
keys to change the parameter. When you have set up
the desired parameters, exit the set-up mode by going to the
top or the bottom of the window with the
or
keys.
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Chapter 1 – Introduction
Measurement Parameters
Detector 1 — RMS Parameters
Parameter
Default
screen
parameter
LXeq
LAeq
Equivalent continuous level
for the duration of the
measurement as defined
by IEC 1672
“A”, “C”
or “L”
–
LXYav4
LAFav4
Averaged sound level with
an Exchange Rate of 4 dB
(LDOD)
“A”, “C”
or “L”
“F” or “S”
LXYav5
LAFav5
Averaged sound level with
an Exchange Rate of 5 dB
(LOSHA)
“A”, “C”
or “L”
“F” or “S”
LXE
LAE
Frequency weighted sound
exposure level for the duration of the measurement as
defined by IEC 1672
(SEL, 1 s)
“A”
–
LXep,d
LAFep,d
Daily Personal Noise Exposure. Recommended by
EEC Directive EEC/86/188
“A”
–
EA
EA,d
Total sound exposure for
the duration of the measurement in Pa2 h
–
–
LXYp
LAFp
Sound pressure level
(SPL)
“A”, “C”
or “L”
“F”, “S” or
“I”
LXYmax
LAFmax
Max. LXYp value detected
within the elapsed time
“A”, “C”
or “L”
“F”, “S” or
“I”
LXYmin
LAFmin
Min. LXYp value detected
within the elapsed time
“A”, “C”
or “L”
“F”, “S” or
“I”
LXYinst
LAFInst
Randomly sampled instantaneous value of RMS level
“A”, “C”
or “L”
“F”, “S” or
“I”
Definition
Freq.
Weighting
Time
Weighting
Table 1.1 Parameters available with the Basic package
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Chapter 1 – Introduction
Measurement Parameters
Detector 2 — Peak Parameters
LXpk
LCpk
Instantaneous peak level
“C” or
“Lin.”
–
LXpkmax
LCpkmax
Max. Peak level detected
during the measurement
“C” or
“Lin.”
–
“C” or
“Lin.”
–
General – other parameters
Number of
Peaks
#cPeaks
Counts the number of seconds where a specified
peak level is exceeded during a measurement
Dose%X
ADose
The dose percentage
based on the LXeq (3 dB
exchange rate)
“A”
“F” or “S”
Dose%XY4
AFDose4
The dose percentage
based on the Lav and a
4 dB exchange rate
“A”
“F” or “S”
Dose%XY5
AFDose5
The dose percentage
based on the Lav and a
5 dB exchange rate
“A”
“F” or “S”
Overload%
Overload%
The percentage of time that
an overload occurred during a measurement
–
–
Underrange%
Underrange%
The percentage of time that
an underrange occurred
during a measurement
–
–
Elapsed
Time
Elapsed
Time
The amount of time that
has passed since the current measurement began
(measurement time excluding pauses)
–
–
Start Time
Start
Time
The start time for the current measurement
–
–
Table 1.1 (Cont.) Parameters available with the Basic package
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Chapter 1 – Introduction
Menu Structure
Start Date
Start
Date
The start date for the current measurement
–
–
Time
Time
The current time
–
–
Table 1.1 (Cont.) Parameters available with the Basic package
1.4
Menu Structure
Mediator has four main menu modes, each initiated by a
dedicated hard key:
●
System menu. section 1.4.2
●
Measurement Set-up menu. See section 1.4.3 below
●
Calibration menu. See section 5.1
●
Data Files. See section 1.4.5 below
The Mediator must be in pause mode before you can select
one of the these menus.
1.4.1
Navigation
Press the desired main menu hard key (see above) when the
normal Measurement Window is displayed. Use the
and
keys to step through the available Settings. The selected
Setting is indicated as inverse text. Press the soft
key
if you want to go to another menu.
Note: You must always revert to the Measurement Window
before you can change menu.
When you reach a Setting you want to change, press the
soft key
or the
cursor key. The set-up
options for that setting are displayed. The first set-up line
you can change is indicated as inverse text. If there are other
set-up lines on the screen you can select them with the
and
keys.
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Chapter 1 – Introduction
Menu Structure
Use the
and
keys to change the parameter you want
to change. Press the soft key to save the new parameter setting. If you change a parameter by mistake, press the
soft key
or the
Meas. Results key to revert
to the previous setting. The soft key
steps one
level up, the
Meas. Results key reverts to the Measurement
Window.
If you press a key that is not allowed or irrelevant in the current
set-up, the
Illegal Entry symbol will appear for a second
980310
in the upper right hand corner of the display.
1.4.2
System Menu
Pushing the
key will display the System menu. For more
information about setting up basic system parameters, see
Chapter 3.
For selecting/setting up:
1.4.3
●
Application (for selecting software module)
●
Date & Time (for setting the date and time)
●
Serial Interface (for setting up the serial interface parameters)
●
Printer Interface (for setting up the printer interface parameters)
●
Language (for selecting the user interface language)
●
Display (for setting the display contrast)
●
Standards (lists the standards that the Mediator complies
with. Also shows the installed software modules)
●
About (system information)
Measurement Set-up Menu
Pushing the
key will display the Measurement Set-up
menu. For more information about setting up the Mediator
for measurement, see Chapter 4.
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Chapter 1 – Introduction
Menu Structure
The following Settings are available:
●
General (for setting the measurement range, the Peaks
Over level and the second exchange rate)
●
Weightings (for setting the frequency weightings for
Detector 1 and 2)
●
Measurement Control (for setting up an Auto Start measurement
●
Correction Filters (for selecting correction filters for
sound incidence and windscreen)
●
Input/Output (for setting up the Aux 1 and Aux 2 sockets)
●
Auto Start (for selecting an Auto Start)
●
Occupational Health (for setting up the Occupational
Health parameters)
●
Save Setup (for saving a measurement set-up)
●
Recall Setup (for recalling a measurement set-up)
Note: You can also change the measurement range by pressing the
key.
1.4.4
Calibration Menu
Pushing the
key will display the Calibration menu. Refer
to Chapter 4 for more information.
1.4.5
●
Calibration (for calibrating the Mediator)
●
Calibration History (contains information about the initial calibration and the 20 latest calibrations)
File System
Memory
Data files, measurement settings, calibration data and calendar data (date and time) are all saved in RAM. This memory is maintained when you turn off the instrument. If the
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User Manual
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Chapter 1 – Introduction
Menu Structure
batteries are removed, the back-up battery will retain the
memory for minimum 6 months (if charged), so that data is
saved.
The serial number and some internal calibration factors are
stored in Flash RAM, which is a non-volatile memory.
Buffer
Holds all of the measurement results from the last measurement period. The buffer is updated once a second. It is cleared
each time you start a measurement with the
key. Results
in the buffer can be output to a printer or saved in a file.
0
Data Files
Measurements are saved in Mediator as files with a file
number and an extension. In addition the files can be identified by the date and time when the file was saved.
You can normally store up to 500 files for each software
package. However, the number of files may be reduced if a
large amount of data is occupied by the Logging module. A
warning is displayed if there is not sufficient memory for the
current measurement.
All files are preserved when you turn off the instrument,
except for the data in the buffer. All measurement data are
copied from the buffer. Measurements can be stored automatically (measurements with a preset measurement time) or
manually (at any time after a measurement is paused).
A basic measurement data file consists of a group of set-up
data and a group of associated measurement data. The setup data are:
BB1119 – 11
●
Serial number for the Mediator
●
Initial calibration parameters
●
Calibration set-up
●
Measurement set-up
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Chapter 1 – Introduction
Backlight
Measurement data are:
●
Set-up and Calibration data
●
Broadband RMS data
●
Broadband Peak data
For more information about Data Files, see Chapter 5.
1.5
Backlight
The backlight makes the display easier to read in low light
situations. Press
to turn it on or off. To save batteries,
the light will switch off automatically after 30 seconds.
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Chapter 2
Getting Started
2.1
Getting Started .....................................................................
2– 2
2.2
Fitting Batteries ..................................................................
2– 2
Checking the Battery Level ..............................................
Using an External Power Supply .....................................
The Back-up Battery .........................................................
Switching the Mediator On and Off .................................
Dismantling/Mounting the Microphone ...........................
2–2
2–4
2–4
2–5
2–5
2.3
Pushkey Definitions ...........................................................
2– 8
2.4
Measurement Window ....................................................
2 – 10
2.5
Changing the Language .................................................
2 – 12
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Chapter 2 – Getting Started
Getting Started
2.1
Getting Started
As supplied from the factory, the Mediator is fitted complete
with microphone and input stage. You only need to fit the
batteries before the instrument is ready for measuring
2.2
Fitting Batteries
Fitting Batteries for the First Time:
1.
The battery compartment is located in the centre of the
back of the instrument. Press the two tabs on the upper
edge of the battery compartment and remove the lid.
2.
Insert new batteries (four 1.5 V LR6/AA size alkaline
batteries) following the +/– orientation shown in the bottom of the battery compartment.
3.
Press the compartment lid back into place.
Note: If you cannot switch on the Mediator after inserting
the batteries, check that you have inserted them correctly.
The Mediator will not switch on if the batteries are inserted
incorrectly, however, it will not be damaged.
2.2.1
Checking the Battery Level
The battery symbol
in the upper right hand corner of the
Measurement Window indicates the current battery level.
When the battery is full, the battery level indicator is fully
black. As the batteries are used, the level will fall until the
indicator is completely empty. When it is time to replace the
batteries, the indicator will be empty and blinking.
The battery level indicator has five indication lines in it. Each
line represents approximately 20% of remaining battery time
(at room temperature), see Fig. 2.1. When the indicator is
empty and blinking, there is less than 15 minutes left. Under
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Chapter 2 – Getting Started
Fitting Batteries
extreme cold or hot environments, the remaining time may
be less.
Batteries full, 100% left
80% left
60% left
40% left
20% left
Replace batteries, approx 15 minutes left
980337e
Fig.2.1 Interpreting the battery level indicator
Caution
It is possible for batteries to explode or leak if they are
handled incorrectly, so:
●
For long-term storage, remove the batteries and keep the
sound level meter in a dry place.
Note: For very long-term storage (more than 6 month)
you must save the files and settings on a PC, if required.
See section 2.2.3.
●
Never mix different makes or types of battery.
●
Never mix new and old batteries.
Note: Rechargeable batteries can be used, however, the operating time may vary considerably, depending on the type
and condition of the cells. The batteries will not be charged
when using an external power supply for the Mediator, they
must be charged outside the instrument.
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Chapter 2 – Getting Started
Fitting Batteries
2.2.2
Using an External Power Supply
The sound level meter can be powered from a regulated 7 –
15 V DC supply via the External Power socket on the base
(e.g. from a mains supply adaptor, see ordering information
in Product Data). The power supply must be able to supply
minimum 400 mA in the nominal voltage range. Maximum
allowable ripple from the adaptor is 100 mVpeak-peak.
You can connect the external power supply even when the
batteries are installed. The sound level meter automatically
selects the source with the highest supply voltage. The external power supply will not damage the batteries and it will
not charge rechargeable batteries.
Note: It is recommended that batteries are always fitted
when using an external power supply. This prevents loss of
power if the external supply is accidentally disconnected.
2.2.3
The Back-up Battery
The sound level meter has a back-up battery for running the
clock and maintaining the data files, even when it is switched
off or the main batteries are removed. Other data, including
the serial number, the microphone serial number and calibration data, are stored in Flash RAM and will remain irrespective of the back-up battery. If the back-up battery is flat,
a “Preparing file system” message will appear when the instrument is switched on and files in the memory are lost.
The back-up battery is recharged automatically when there
are standard batteries in the sound level meter. It is fully
charged after about 10 hours. Fully charged, the back-up battery runs the clock and retains records and settings for about
6 months. These charge times are typical for a sound level
meter at room temperature.
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Chapter 2 – Getting Started
Fitting Batteries
2.2.4
Switching the Mediator On and Off
Switching On
Press . The Brüel & Kjær logo is displayed for a few seconds
before the Measurement Window appears. The instrument
returns to pause mode with the set-up it had when it was
last switched off.
Default Set-up
You can revert to the default set-up by recalling Default
from the Save/Recall Window in the Measurement Set-up
menu, see section 4.1.11. All results in the buffer are deleted
and the instrument returns to the default set-up in pause
mode. Refer to section 10.2 in Appendix 1 for a list of default
parameters.
Switching Off
The Mediator can only be switched off from pause mode. Press
to enter pause mode and then press
to switch off
the instrument. Even when the instrument is switched off,
the memory circuits are still energized and all settings and
saved measurement data are maintained.
2.2.5
Dismantling/Mounting the Microphone
If it is required to dismantle/mount the microphone, note the
following precautions:
BB1119 – 11
●
When screwing on the microphone, input stage, protection grid and extension cables, do it gently to avoid
damaging the threads.
●
Keep dust and foreign matter off the microphone diaphragm. Do not touch the diaphragm with anything —
it is very delicate. Small amounts of dust on the diaphragm will not affect the microphone response.
2238 Mediator
User Manual
2–5
Dismantling/Mounting the Microphone and Input Stage
The microphone supplied with the Mediator is the Prepolarized Free-field 1/2″ Microphone Type 4188 that requires no
external polarization voltage.
1.
Fig.2.2
2–6
Unscrew the threaded retaining ring (see Fig. 2.2) that
secures the input stage. The input stage can now be
removed from the input stage socket at the top of the
Mediator.
Mounting the input stage and microphone onto the sound level
meter. 5-pin DIN connectors are used
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User Manual
Brüel & Kjær
Chapter 2 – Getting Started
Fitting Batteries
2.
Unscrew the microphone from the Input Stage ZC0030.
Do not remove the protection grid from the microphone.
Fitting is the reverse of dismantling.
Connecting a Microphone Extension Cable
Two optionally available extension cables can be used with
the Mediator:
●
AO 0561
3 m long
●
AO 0560
10 m long
Note: Older cables Types AO 0408 and AO 0409 can also be
used.
Fig.2.3 Connecting a microphone extension cable to the sound level meter
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Pushkey Definitions
To Connect:
1.
Insert the microphone extension cable into the input
stage. Secure the connection by turning the threaded
retaining ring.
2.
Insert the other end of the microphone extension cable
into the input stage socket and secure by turning the
threaded retaining ring. (see Fig. 2.3).
Note: Connecting a recommended microphone extension cable has no effect on the sound level meter’s calibration. Therefore, you do not have to re-calibrate after connecting one of
the recommended microphone extension cables.
2.3
Pushkey Definitions
Each pushkey on the sound level meter’s front panel is
marked with a pictogram. This section gives a brief explanation of the buttons.
2–8
Power
Press this key to switch the instrument on or off. The instrument will
be in pause mode when started up.
Calibrate
Press this key to calibrate your instrument. See section 5.1 for calibration instructions.
System
Press this key to display the System menu for configuring the instrument
and
for
changing
application programs. See section
4.1 in Chapter 3 for system options.
Data Files
Press this key to select the Data
Files menu. The menu options in
this window allows you to save,
print and edit printout files and to
access the File Manager facility.
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Pushkey Definitions
Set-up
Press this key to access/step
through the set-up options in the
Measurement Set-up menu. See
section 4.1.2 in Chapter 3 for details about the available settings.
Up/Down Arrows
Press these keys to step up/down
in the menu items in the selected
window. Also for entering/exiting
edit mode in the Measurement
Window.
Left/Right Arrows
Press these keys to select the parameters in the selected window.
Note: For the sake of consistency
the
keys are always used
to select menu items, and the
keys are always used to select values.
Range
Reset
Meas. Results
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Press this key to access the Range
Setting menu. Use the
keys to step through the available
measurement ranges or scroll with
the
key.
0
Resets the current measurement
data and sets the buffer and timer
to zero. If a measurement is in
progress, it will continue immediately after reset. If the instrument
is paused, it will still be paused
after pressing Reset.
Note: If a measurement has been
in progress for more than a minute
a warning is displayed and you
must confirm the command before
any data is deleted.
Press this key in any of the set-up
menus to return to the Measure-
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Measurement Window
ment Window. If menu changes
have not been saved, they will be
cancelled.
2.4
Pause/Continue
Press this key to pause/continue
the current measurement. If the
sound level meter is in pause mode,
the measurement is continued
without resetting data or the timer.
Select
Softkey with functions ,
, or depending on the cursor position in
the current menu. The
function displays the File Manager
Options Window.
Cancel
Softkey with functions ,
or depending on
the cursor position in the current
menu.
Backlight
Switches the display’s backlight on
or off. To save batteries, the backlight switches off automatically after 30 seconds.
Measurement Window
During normal operation the Measurement Window is used
to view the measured data. It provides several kinds of information about your settings and measurements.
1.
Bar graph: This is a quasi-analogue display that shows
a graphical representation of the current sound pressure
level (Inst.), based on the RMS value from Detector 1. It
is updated 5 times a second.
a. The bottom end of the measurement range (in dB): All
sound below this level will register as under-range. To
change the starting point for the measurement range,
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Bargraph
Battery Indicator
Run/Pause Indicator
Illegal Entry
Parameter Fields
Value Fields
980335e
Fig.2.4 The Measurement Window
press
while measurement is paused, you can then
step up the measurement range.
b. The upper end of the measurement range (in dB) and
overload indicator: Peaks above this level will trigger
an “OVERLOAD” indication that will appear under the
bar graph, see Fig. 2.5. If an overload has occurred in
the last one second, this indication will stay for the
next second. This indication will appear both in pause
mode and in measurement mode. If an overload occurs
during a measurement in progress, a “latched overload” symbol will appear to the right of the bar graph,
see Fig. 2.5. The latched overload remains until the
measurement is reset, also if the measurement is
paused. To change the measurement range, press
.
Overload indicator
Latched overload symbol
980336e
Fig.2.5 Overload indicators
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Changing the Language
2.
Run/Pause indicator: Displays the current status of
measurement. Press
to continue
or pause
a measurement. Press
to start a “new” measurement
(resetting measurement data and the timer).
0
3.
Battery level: When the batteries are new, the
indicator is completely black. As the batteries are used, the
level falls. Replace the batteries when this indicator is
empty and blinking.
4.
Parameter fields: Specifies the measurement parameters
5.
Value fields: Indicates the measurement values for the
selected parameters.
6.
Illegal Entry: The
symbol lights up for a second if
you press a key that has no function in the current window.
980310
2.5
Changing the Language
The default user interface language for the Mediator is English.
How to Change the Language
The following languages can be selected
2 – 12
●
English
●
Français
●
Deutsch
●
Italiano
●
Español
1.
From the Measurement Window press the
to select the System menu.
2.
Select the Language menu item with the
cursor
keys and enter by pressing the
softkey.
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Changing the Language
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3.
Select the language you want to install by using the
or
keys.
4.
When the desired language is displayed, press the
softkey to enter the selection.
5.
Press the
softkey twice to return to the
Measurement Window, or press the
Meas. Results
key.
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Chapter 3
System Menu
3.1
System Menu .........................................................................
Introduction .......................................................................
Selecting the System Menu and Parameters...................
Selecting Application Module ...........................................
Setting the Date and Time................................................
Setting up the Serial Interface Parameters.....................
Setting up the Printer Interface Parameters...................
Choosing the Language .....................................................
Adjusting the Display Contrast ........................................
Displaying the International Standards ..........................
Displaying System Information........................................
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Chapter 3 – System Menu
System Menu
3.1
System Menu
3.1.1
Introduction
This chapter explains how to set up basic parameters in the
System menu, such as application program, interface and
language. Once these parameters are set up, they are not
normally changed until a measurement session is completed.
3.1.2
Selecting the System Menu and Parameters
The System menu is used for setting up and reading basic
system parameters. It contains the menu items shown in
Fig. 3.1.
Fig.3.1
The System menu. The arrows to the left indicate that there is
more than one window
1.
The System menu is accessed by pressing the
System
key when the instrument is paused. If the instrument is
measuring you must press
to pause. Select the desired menu item with the
cursor keys.
This will also cause the and soft keys
to appear.
2.
Press the
softkey or the
to enter the selection.
cursor key
This will also cause the and soft keys to
appear.
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System Menu
Alternatively you can step through the menu items by pressing the System key repeatedly. The first time you press the
key the System menu is displayed and the following key clicks
steps you directly through the menu items, starting with the
first item in the menu.
The arrows on the left-hand side of some of the screens indicate that there is more than one screen page. These pages
are cyclic, i.e., when you pass the top or the bottom line of
the menu you automatically go the bottom or top line of the
next/previous page, respectively.
Selecting Parameters
1.
Select the desired parameter from the sub-menu with the
cursor keys.
2.
Then use the
cursor keys to step through the available settings or values of that parameter until the one
you need is displayed.
The range of available settings for each parameter is
given in the following sections.
Note: If you want to change a parameter value, you may
hold the
cursor keys down to automatically increase or decrease the value.
3.
Press the soft key to confirm the selection. If you
wish to undo any of these, press the soft key
and all settings/values will revert to what they were the
last time the soft key was pressed.
4.
Repeat steps 1, 2 and 3 until you are satisfied with the
setting or value of each parameter.
5.
Press the softkey to revert to the Measurement
Window after you have pressed the or key.
Meas. Result key to
go directly from a menu to the Measurement Window.
Note: Normally you can use the
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System Menu
3.1.3
Selecting Application Module
Select the desired application module from the Application
Window. You can only select the application modules that
have been installed in the instrument. Refer to the associated
User Manuals for installation of application modules.
Fig.3.2
The Application Window. This example contains three application modules (the Basic SLM Software is always installed)
The currently possible options are:
3.1.4
●
Enhanced SLM — Enhanced SLM Software BZ 7125
●
Freq. Anal. SLM
BZ 7123
●
Logging SLM — Logging SLM Software BZ 7124
— Frequency Analysis Software
Setting the Date and Time
The Date & Time Window has the appearance as shown in
Fig. 3.3.
Fig.3.3 The Date & Time Window
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System Menu
You can set:
●
Year
●
Month
●
Date
●
Time
The clock is running while you set the date and time. Simply
step the clock settings forwards or backwards until the clock
is synchronized with the real time.
3.1.5
Setting up the Serial Interface Parameters
The Baud Rate and Handshake interface parameters can be
set up from the Serial Interface Window illustrated in
Fig. 3.4. Notice that these parameters are used only for control via the RS 232 interface.
Fig.3.4 The Serial Interface Window
You must set up the interfaces of the Mediator and the instrument connected to the serial interface socket to the same
baud rate and handshake settings to enable communication.
Setting the Baud Rate
●
4800
●
9600
●
19200
●
38400
●
115200
Select the desired baud rate in the Baud Rate field.
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Selecting Handshake
●
Hardwired
●
Modem
Select the desired type of handshake in the Handshake field.
3.1.6
Setting up the Printer Interface Parameters
You can set up separate Baud Rate and Handshake interface
parameters for a printer, in the Printer Interface Window illustrated in Fig. 3.5.
Fig. 3.5 The Printer Interface Window
Setting the Baud Rate
●
4800
●
9600
●
19200
●
38400
●
115200
Select the desired baud rate in the Baud Rate field.
Selecting Handshake
●
XON/XOFF
●
Hardwired
Select the desired type of handshake in the Handshake field.
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System Menu
3.1.7
Choosing the Language
The language used in the instrument’s display screen can be
changed in the Language Window, as illustrated in Fig. 3.6.
Fig.3.6 The Language Window
The following languages can be selected
3.1.8
●
English
●
Francais
●
Deutsch
●
Italiano
●
Espanol
Adjusting the Display Contrast
You can adjust the LCD screens contrast in the Display
Window (see Fig. 3.7), to compensate for various lighting conditions and viewing angles. The contrast adjustment is particularly useful in very high or low temperature
environments.
Fig.3.7 The Display Window
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Contrast Adjust
●
1 ¥ 5
You can adjust the contrast in five steps, where 5 indicates
the highest contrast level. The default setting is 3.
3.1.9
Displaying the International Standards
The Standards Window in Fig. 3.8 shows the international
standards that Mediator complies with.
Fig.3.8 The Standards Window
3.1.10 Displaying System Information
The About System Window is shown in Fig. 3.9 and contains
the following information:
Fig.3.9 The About System Window
3–8
●
Current application module (type)
●
Mediator serial number
●
Microphone serial number (supplied microphone)
●
Filter set
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Chapter 4
Measurement Set-up Menu
4.1
Measurement Set-up Menu ............................................
4– 2
Introduction ....................................................................... 4 – 2
Selecting the Measurement Set-up Menu
and Parameters ................................................................. 4 – 2
Setting up General Measurement Parameters................ 4 – 3
Setting Frequency Weightings ......................................... 4 – 5
Measurement Control ....................................................... 4 – 6
Selecting Correction Filters .............................................. 4 – 7
Setting up the Input/Output Function ............................. 4 – 8
Setting Mediator to Start Automatically ......................... 4 – 9
Setting the Occupational Health Parameters................ 4 – 11
Saving Measurement Set-ups ......................................... 4 – 12
Recalling Measurement Set-ups ..................................... 4 – 13
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Chapter 4 – Measurement Set-up Menu
Measurement Set-up Menu
4.1
Measurement Set-up Menu
4.1.1
Introduction
This chapter explains how to set up basic measurement parameters in the Measurement Set-up menu, such as range
and weighting.
4.1.2
Selecting the Measurement Set-up Menu and
Parameters
The Measurement Set-up menu is used for setting up basic
measurement parameters and measurement control parameters. Basic SLM Software BZ 7126 contains the menu items
shown in Fig. 4.1.
Fig.4.1 The Measurement Set-up menu (two windows)
1.
The Set-up menu is accessed by pressing the
System
key when the instrument is paused. If the instrument is
measuring you must press
to pause. Select the desired menu item with the
cursor keys.
This will also cause the and soft keys
to appear.
2.
Press the
softkey or the
to enter the selection.
cursor key
This will also cause the and soft keys to
appear.
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Measurement Set-up Menu
Alternatively you can step through the menu items by pressing the Set-up key repeatedly. The first time you press the
key the Set-up menu is displayed and the following key clicks
steps you directly through the menu items, starting with the
first item in the menu.
The arrows on the left-hand side of some of the screen indicate
that there is more than one screen page. These pages are
cyclic, i.e., when you pass the top or the bottom line of the
menu you automatically go the bottom or top line of the next/
previous page, respectively.
4.1.3
Setting up General Measurement Parameters
The General Window is used for setting up the measurement
range, the peaks over indication and the second exchange
rate, see Fig. 4.2.
Fig.4.2 The General Window
Measurement Range
In Range you can select the following default measurement
ranges:
●
0 to 80 dB
●
10 to 90 dB
●
20 to 100 dB
●
30 to 110 dB
●
40 to 120 dB
●
50 to 130 dB
●
60 to 140 dB
Note that the dynamic range is always 80 dB. However, if a
non-standard transducer is used and calibrated, the upper
and lower limits may be offset.
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Measurement Set-up Menu
The range you choose will depend on the environment in
which you are measuring. It is important to select the measurement range so that the instrument is sensitive enough to
measure all relevant sound, but not so sensitive that it overloads. Your measurement will not be accurate if an overload
occurs. See section 2.4 for more information about overloads.
To Set the Measurement Range
Check the current measurement range. It is shown at the
top of the Measurement Window.
Use the quasi-analogue display to decide if you have set the
range correctly. If the display is blank most of the time, then
sound levels are too low; select a lower measurement range.
If the display becomes full and the “Overload” warning appears under the bar graph, then sound levels are overloading
the instrument; select a higher range.
Alternatively you can access the Range Setting Window directly by using the
key.
Setting the Peaks Over Indication
Peaks Over fixes a level for counting the number of times
this level is exceeded by peak values and registered during
a measurement. Intervals of 1 s are used and only one overload per period is registered.
The Peaks Over level can be set in 1 dB steps from 0 to
180 dB. The setting is independent of the selected linear
measurement range (see above). The default level is 140 dB.
Note that the first decimal(s) and the last decimal of the
value field are set up independently. Use the
cursor
keys to select the desired decimal.
To monitor the Peaks Over value on the screen, select the
#cPeaks field in the Measurement Window.
Setting the Second Exchange Rate
The 2nd Exch. Rate is used for evaluation of hearing risk
and is described in Appendix section 10.1.
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Measurement Set-up Menu
The 3 dB Exchange Rate is always measured. You can select
an additional Exchange Rate of 4 or 5 (dB). The Second
Exchange Rate is used for measuring averaged sound levels
with 4 dB (LDOD) or 5 dB (LOSHA) Exchange Rate, respectively. The LXav parameter will change accordingly in the Measurement Window.
4.1.4
Setting Frequency and Time Weightings
The Weightings Window is used for setting up time and
frequency weightings for detector 1 and frequency weightings
for detector 2, see Fig. 4.3.
Fig.4.3 The Weightings Window
In the basic version, Detector 1 is RMS and Detector 2 is Peak.
Setting Bandwidth and Time Weighting for Detector1 (RMS)
●
Broad-band (F, S, I)
●
1/3-octave (F, S, I)
●
1/1-octave (F, S, I)
Select the desired option in the Bandwidth field.
Note: The 1/3-octave and 1/1-octave options only appears when the 1/1-octave and 1/3-octave Filter Set is installed
in Mediator.
Setting Frequency Weighting for Detector 1
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●
A, C, L (Broad-band)
●
31.5 Hz ... 8 kHz (1/1-octave)
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Measurement Set-up Menu
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20 Hz ... 12.5 kHz (1/3-octave)
Select the desired standardized frequency weighting or centre
frequency in the Freq. Wgt. field. The centre frequencies
depend on the setting in the Bandwidth field.
Setting Frequency Weighting for Detector 2 (Broad-band)
●
Peak/C
●
Peak/L
You can select the C or L frequency weighting for Detector 2
in the Weighting field.
4.1.5
Measurement Control
The Meas. Control Window is used to set up a preset measurement time and to activate/deactivate it, see Fig. 4.4.
Fig.4.4 The Measurement Control Window
In the Basic module only one measurement can be specified
in the No. of Meas. field (in the Enhanced module you
can specify up to 99 measurements).
When switched On, the Auto Start is started as a normal
measurement, using the
key. During an Auto Start you
can control the instrument in the normal way, for example,
you can pause a measurement and resume it.
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Measurement Set-up Menu
Switching the Sequence On/Off
The Sequence field is for switching the measurement sequence On or Off. The sequence parameters only appears
when sequence is set to On.
Setting the Preset Measurement Time
Preset Time is for pre-setting the measurement time.
●
Hours: Can be set from 0 to 99 in one hour steps
●
Minutes: Can be set from 0 to 59 in one minute steps
●
Seconds: Can be set from 0 to 59 in one second steps
Note: Minimum measurement time is 30 seconds
4.1.6
Selecting Correction Filters
The Correc. Filters Window in Fig. 4.5 allows you to select filters to make corrections for sound incidence and windscreen influence.
Fig.4.5 The Correction Filters Window
Selecting the Sound Incidence Filter
The Sound Incidence correction can be set to:
●
Frontal
●
Random
In general Frontal is used for sound with 0° incidence and
Random is used for diffuse sound. In practice the correction
depends on your local standard and the application. Generally
ISO requires Frontal and ANSI requires Random.
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Measurement Set-up Menu
Selecting the Windscreen Correction
The Windscreen Correction can be set to:
●
On
●
Off
The windscreen filter makes a frequency correction corresponding to the influence of Windscreen UA 0237. With the
correction on, Class 1 precision is maintained over the full
frequency range (see specifications).
4.1.7
Setting up the Input/Output Function
The Input/Output Window controls the function of the
Aux 1 and Aux 2 inputs/outputs. See Fig. 4.6.
Fig.4.6 The Input/Output Window
In the Basic module Aux 1 is always set to AC output and
Aux 2 is always set to DC output.
Selecting Frequency Weighting for Aux 1
In the Freq. Wgt. field you can select:
●
Linear
●
Det. 1
AC Output supplies the AC output signal to the Aux 1 socket.
Frequency weighting depends on the Freq. Wgt. field (see
below). Full-scale indication corresponds to 1 V RMS and the
output is attenuated according to the selected range. This
output signal can be used, for example, for recording the
measured signal on a DAT recorder.
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L frequency weighting is used when Linear is selected. When
you select Det. 1, the frequency weighting selected on the
RMS detector is used.
Aux 2
DC Out supplies a DC output signal equivalent to the AC
output signal. It is the time weighted signal (Fast, Inst.) from
detector 1. Full-scale indication corresponds to 4.0 V DC
(50 mV/dB).
4.1.8
Setting Mediator to Start Automatically
The Auto Start Window allows you to set up Mediator to
start automatically at any time and date within the next
month. The Auto Start Window is illustrated in Fig. 4.7.
Fig.4.7 The Auto Start Window
After setting up an Auto Start the Mediator must be switched
off. Then, at the set time, it will switch on, load the specified
set-up, reset and start measuring.
Once the Mediator has started measuring with Auto Start,
you can control it in the normal way. Measurements will
continue until the Mediator is switched off manually or the
batteries run out.
If the Mediator is already switched on at the time it has been
set to automatically start measuring, Auto Start is cancelled
and has no effect. Auto Start does not affect your use of the
Mediator while it is switched on or your current measurement
results.
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Measurement Set-up Menu
When the set Auto Start time has passed, Auto Start will be
switched off when you switch off the instrument. This prevents the instrument from repeating an automatic measurement every month.
Selecting an Auto Start
In the Auto Start no. field you can set up up to four different Auto Starts. You must ensure that there are no conflicts with other Auto Starts. If two Auto Starts in different
applications are set up to start within the same time span,
the Auto Start that starts first takes priority.
Application
The Application field shows the name of the application
module from which the current Auto Start was created. The
following options exist:
●
None
Disables the current Auto Start and indicates that this Auto
Start has not been set up.
●
BZ xxxx
Activates the Auto Start and shows the owner status for the
current Auto Start. If the application name is different from
the application module that you are currently using, i.e. if
the Auto Start has been set up with a different application
module, you cannot change the set-up parameters. If you
want to change the owner status for the Auto Start you can
do so by using the
cursor keys. When you have
changed the owner status to the current application name
you can change the parameters as desired.
Setting Start Time for an Auto Start
The Date and the Time fields are used for setting up month,
day and time for the current Auto Start. The Mediator will
be automatically switched on shortly (approx. 30 s) before the
set time, so that it is ready for measurement at the specified
time.
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Measurement Set-up Menu
Selecting the Set-up for an Auto Start
With the Use Setup No. field a stored measurement set-up
(1 to 4) can be attached to an Auto Start. When the Auto
Start is executed, the specified measurement set-up is automatically loaded.
4.1.9
Setting the Occupational Health Parameters
You can measure noise dose levels by setting up the parameters in the Occupational Health Window, see Fig. 4.8.
Fig.4.8 The Occupational Health Window
The Mediator can measure A-, C- or Lin.-weighted dose levels
with Exchange rates of 3 dB (Leq) and 4 or 5 dB (Lav) levels
with A- and C-weighting. Select the desired dose parameter
in the Measurement Window. The Leq value (with exchange
rate of 3) is always measured. Lav is measured simultaneously, but before measurement you must select exchange rate of
4 or 5 dB in the General Window. Note that the 4 or 5 dB
Lav parameters are measured with F or S time weighting.
The dose level represents the amount of received sound energy expressed as a percentage of the daily allowed dose
(100% level).
Setting the Exposure Time
In the Exposure Time field you can set, in hours and minutes, the actual time that you are exposed to noise during a
workday. The noise dose calculation is based on the time you
are exposed to the noise (Exposure Time) relative to a normal 8 hour workday.
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Measurement Set-up Menu
Specifying the Criterion Level
The Criterion Lev. sound level is specified in your local
standard. It is the level of a sound which, continuously applied for eight hours, results in a 100% criterion exposure.
The calculation of the noise dose level is based on the criterion
level and the exposure time.
Specifying the Threshold Level
The Threshold Lev. level may be specified in your local
standard. Any sound levels below the threshold value do not
contribute to the Dose measurement data. For example, if
you set the threshold value to 80, any sound levels below
80 dB are not taken into consideration by the instrument
when it calculates integrated values (Leq, Lav, Dose).
4.1.10 Saving Measurement Set-ups
You can save up to four measurement set-ups for each application package in the Save Setup Window, see Fig. 4.9.
Fig.4.9 The Save Setup Window
When you save a measurement set-up, you save all the parameters in the Measurement Set-up menu (see section 4.1.2).
Ensure that these parameters are set up correctly before you
proceed.
Saving the Current Measurement Set-up
●
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Measurement Set-up Menu
In the Save in no. field, select the number which you want
to save the current set-up as. The selected set-up is saved
when you press the
Softkey.
4.1.11 Recalling Measurement Set-ups
Measurement set-ups are recalled in the Recall Setup Window, see Fig. 4.10.
Fig.4.10 The Recall Setup Window
When you recall a measurement set-up, you recall all the
parameters listed under Recalling Measurement Set-ups
above.
Recalling a Measurement Set-up
●
1 – 4
●
Default
From the Recall from no. field you can recall a stored setup by entering the desired set-up number. The stored set-ups
are identified by the date they were saved. The date for a
stored set-up appears in the bottom line. You can also recall
the factory default set-up. Refer to section 10.2 in Appendix
1 for a list of default parameters. The selected set-up is
recalled when you press the
Softkey.
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Chapter 5
Measuring
5.1
Calibrating..............................................................................
5– 2
Introduction .......................................................................
Calibrating the Mediator ..................................................
Checking the Calibration ..................................................
Calibration History ...........................................................
5–2
5–3
5–7
5–7
5.2
Starting a New Measurement .......................................
5– 8
5.3
Pausing a Measurement ..................................................
5– 9
5.4
Continuing a Measurement ............................................
5– 9
5.5
Measuring in 1/1- and 1/3-octave bands ...................
5 – 10
5.6
Setting the Mediator to Start Automatically .......
5 – 10
5.7
Changing Displayed Measurement Parameters .
5 – 11
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Chapter 5 – Measuring
Calibrating
5.1
Calibrating
5.1.1
Introduction
When to Calibrate
The standards recommend that you calibrate your sound level
meter before each set of measurements (see section 5.1.2) and
check the calibration after each set (see section 5.1.3).
Connecting a recommended microphone extension cable (see
section 2.2.5) has no effect on Mediator’s calibration. Therefore, you do not have to recalibrate after connecting one of
the recommended microphone extension cables.
Principle of Calibration
Mediator uses a sensitivity value to check for drift. This is
shown in the Calibration Window. When calibrating, Mediator first checks the calibration signal against the calibration level you have specified. It shows you the new sensitivity
value required for correct calibration, the current (previous)
and the initial (factory) sensitivity values and asks if you
want to recalibrate. If you press , Mediator calibrates itself according to this new calibration level (i.e. it
adjusts the sensitivity according to the calibration level.
During this procedure, Mediator is automatically set to use
the reference measurement range and settings. To ensure
that a calibration is valid, Mediator compares the output from
both detectors during calibration. It also ensures that the
calibration level is stable during calibration. The maximum
allowed standard deviation is 0.1 dB over a 4 second period.
Calibrating for Free-field or Diffuse Field Measurements
The sound level meter is calibrated in the same way for freefield measurements (according to IEC) and diffuse field measurements (according to ANSI). However, the calibration levels
for some calibrators may be different, depending on which
measurements are to be made. See the calibrator’s user manual for more details. The correction filters are automatically
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Chapter 5 – Measuring
Calibrating
set to Frontal and Windscreen Off during calibration. After calibration they return to the previous settings.
Which Calibrators Can I Use?
Mediator is normally used with the supplied microphone Type
4188. The initial (factory) calibration is performed with the
microphone supplied with Mediator. However, an unspecified
transducer, e.g. another microphone or a hydrophone may be
used. In principle, since you specify the calibration level, any
calibration level in the range 50 to 200 dB can be used, depending on the transducer.
Microphones are usually calibrated at 94, 114 or 124 dB. The
default value for Mediator is 94.0 dB. Sound Level Calibrator
Type 4231 provides 94 or 114 dB SPL at 1 kHz. Multifunction
Acoustic Calibrator Type 4226 provides 94, 104 or 114 dB
SPL. Hydrophone Calibrator Type 4229 generates 151 to
166 dB re 1 µPa at 250 Hz.
Each calibrator is slightly different. The actual calibration
level is not necessarily equal to the nominal calibration level.
It is, therefore, important to set the calibration level to the
one given on the calibration chart for the calibrator used.
5.1.2
Calibrating the Mediator
For day to day calibration, you only need to calibrate at one
level at one frequency. In order to comply with the standards,
calibrate the sound level meter with a reference signal of
94 dB* at 1 kHz.
To calibrate with microphone Type 4188:
1.
Switch on the Mediator and press the
Calibrate key.
Select Calibration from the Calibration menu, see
Fig. 5.2.
* When using Type 4231 set the calibration level to 93.9 dB for free-field calibration according to IEC standards. For pressure calibration according to ANSI standards, set the
level to 94.0 dB.
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Chapter 5 – Measuring
Calibrating
Fig.5.1
Fitting Sound Level Calibrator Type 4231 onto the Mediator.
Multifunction Acoustic Calibrator Type 4226 is fitted in a similar way (see its manual)
The Current Calibration Window appears as shown in
Fig. 5.3.
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Chapter 5 – Measuring
Calibrating
Fig.5.2 The Calibration menu
Fig.5.3 The Current Calibration Window
BB1119 – 11
●
Microphone — shows the serial number for the Type
4188 supplied with the Mediator or if an unspecified
transducer has been used for the calibration
●
Calibration Level — the calibration level that was
specified
for
the
current
calibration.
The
Calibration Level must be within 50 to 200 dB and
can be stepped in 1 and 0.1 dB steps. The default value
is 94.0 dB
●
Sensitivity — the sensitivity value calculated by
Mediator as a result of the current calibration. You
cannot access this field
●
Date — the date for the current calibration. You cannot access this field
2.
Check that microphone Type 4188 is selected and that
the calibration Level is set to 94.0 dB (or the calibration
level specified on the calibrators calibration chart).
3.
Press Calib. and Fit the calibrator carefully onto the
sound level meter and rest the sound level meter on a
table or other flat surface. Ensure that the calibrator fits
snugly on the microphone (see Fig. 5.1).
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Chapter 5 – Measuring
Calibrating
4.
For the multifunction acoustic calibrator, set it up to
calibrate at 94dB and 1 kHz (see the calibrator’s instruction manual).
5.
Switch on the calibrator.
The calibrator emits a 1 kHz calibration signal.
6.
Press Start and wait until the calibration is finished.
If the calibration is successful the Calibration Result
Window will appear as shown in Fig. 5.4.
Fig.5.4 The Calibration Result Window
7.
5–6
●
Calibration Level — the calibration level you have
specified
●
New Sens. — the new sensitivity value calculated by
Mediator as a result of the calibration
●
Current Sens. — the current sensitivity value that
is valid until you press the Accept key. Comparing
the New Sens. and the Current Sens. values gives
you the option to evaluate the relative deviation since
the last calibration
●
Initial Sens. — the factory sensitivity value. Allows you to evaluate the absolute deviation since the
instrument was manufactured. If the New Sens. value deviates more than ±1.5 dB from the
Initial Sens. value, an error message will appear
Press Accept if the New Sens. value is within acceptable limits. The New Sens. value is implemented.
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Chapter 5 – Measuring
Calibrating
Press Cancel if you cannot accept the New Sens. value.
A new calibration must be performed. This also applies
if the Calibration Error warning appears.
5.1.3
●
Check that the microphone has been fitted properly
●
Check that the calibrator has been switched on and
is working properly
●
Check that the Calibration Level has been entered
correctly
●
External noise or vibrations may have affected the
calibration
●
Inspect the microphone to see if it has been damaged
Checking the Calibration
Follow the instructions given in section 5.1.2 until item 8. If
the New Sens. value is similar to the Current Sens. value
press the Cancel key to return to the main screen. Otherwise
a recalibration is required.
5.1.4
Calibration History
Select Calibration History from the Calibration menu.
The Calibration History Window will appear as shown
in Fig. 5.5.
Fig.5.5 The Calibration History Window
The first line in the Calibration History Window always
shows the initial (factory) calibration sensitivity and the serial number for the supplied microphone. In addition the
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Chapter 5 – Measuring
Starting a New Measurement
Calibration History Window contains information about
the 20 latest calibrations. The following information is stored:
●
Date — year, month and day for the calibration
●
Sens. — the calculated sensitivity for the calibration
●
Mic. — indicates whether the calibration was performed with the supplied 4188 microphone (serial
number) or with an unspecified transducer (Unspec.)
Press Print if you want to print out the calibration history
list.
5.2
Starting a New Measurement
1.
Switch on the Mediator.
●
5–8
If another application program has been used, select
the Basic SLM software from the System menu. Normally you do not need to change any parameters in
the System menu (see section 4.1).
2.
Calibrate the sound level meter as described in section
5.1.2.
3.
Set up the parameters in the Measurement Setting menu,
as described in section 4.1.2. Normally you will only need
to:
●
Select a suitable measurement range. This reduces
the risk of you having to change the range during a
measurement in order to avoid overloads. Overloads
reduce the validity of your results and changing the
measurement range causes a reset.
●
If you want to measure according to IEC standards
(i.e. free-field), set Sound Incidence to Frontal in
the Correction Filters Window and simply point
the sound level meter towards the sound source.
●
If you want to measure according to ANSI standards
(i.e. diffuse-field), set Sound Incidence to Random in
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Chapter 5 – Measuring
Pausing a Measurement
the Correction Filters Window. The direction of
the sound level meter is unimportant. If, however, the
sound field is free, measure with the sound level meter
at an angle of between 70 and 80° to the sound source.
●
4.
Select the desired measurement parameters in the
Measurement Window.
Press
. The sound level meter starts measuring with
the selected set-up.
Note: If you want to delete the measured data and set the
buffer and timer to zero, press
. If the measurement has
been in progress for more than one minute, a warning is
displayed and you must confirm that data is to be deleted.
0
5.3
Pausing a Measurement
The Pause mode of the Mediator allows you to store results
in its memory or transfer results across the interface to a
printer or computer.
Press
. The
Pause symbol appears in the upper lefthand corner of the display. The clock stops counting the measurement time. The display and quasi-analogue scale continue
to show the current status of the displayed parameters and
input signal level, respectively. In Pause mode, however, no
results or overload indications are added to the buffer.
5.4
Continuing a Measurement
Press
. The
Measurement symbol is shown instead of
the Pause symbol.
The clock continues counting the measurement time from the
point at which it stopped. Results are added to the buffer.
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Chapter 5 – Measuring
Measuring in 1/1- and 1/3-octave bands
5.5
Measuring in 1/1- and 1/3-octave
bands*
Follow the instructions below to perform 1/1- and 1/3-octave
band measurements.
1.
Select 1/3-octave or 1/1-octave in the Bandwidth
field as required (see section 4.1.4).
2.
Select the centre frequency of the band in which you want
to start the analysis, in the Freq. Wgt. field in the
Weightings Window.
3.
After you have completed the measurement in that frequency band, press
.
4.
Store the measurement result in a file (see section 6.3).
5.
Select the centre frequency of the band in which you want
to continue the analysis. You are now ready to measure
in the next frequency band.
6.
Repeat steps 3 to 5 for the other bands in which you
want to measure.
For automatic frequency analysis measurements Frequency
Analysis Software BZ 7123 is recommended. It is, however,
possible to make a frequency analysis as a series of measurements in various frequency bands, as explained above.
5.6
Setting the Mediator to Start
Automatically
The Mediator can be set to automatically start at any time
and date within the next month (for example from 19th May
to 18th June). To set up an Auto Start, refer to section 4.1.8.
* Only available with Mediator 2238 –A– F (version with filter set installed)
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Chapter 5 – Measuring
Changing Displayed Measurement Parameters
5.7
Changing Displayed Measurement
Parameters
The parameters available are listed in section 1.3. The selected parameters and the measurement values are shown at
the bottom of the Measurement Window.
After a
Reset, “– – –.–” is shown for all integrated values
until after the first second. Instantaneous (and SPL) values
are displayed continuously. This is because the levels are not
yet available. Some of the averaged values take even longer,
Pause
depending on the averaging times. When pressing
all values are displayed continuously. The Bar Graph always
shows the current SPL level (LXYinst), regardless of the selected parameters.
0
The parameters can be changed while a measurement is in
progress.
1.
Use the
cursor key to go to the desired parameter
line in the Measurement Window.
2.
Select the desired measurement parameter with the
cursor keys.
3.
Return to the basic Measurement Window with the
cursor keys.
or
When the time or frequency weightings or the exchange rate
are changed, the associated measurement parameters in the
Measurement Window are automatically changed and the
counter is reset.
Note: If the measurement has been in progress for more than
one minute, a warning is displayed and you must confirm
that data is to be deleted.
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Chapter 6
Data Handling
6.1
Data File System .................................................................
6– 2
Saved Data......................................................................... 6 – 3
Set-up Data ........................................................................ 6 – 3
Measurement Data............................................................ 6 – 4
6.2
Selecting the Data Files Menu ......................................
6– 4
6.3
Store Files ...............................................................................
6– 5
6.4
Print Options .........................................................................
6– 5
6.5
Print ...........................................................................................
6– 7
6.6
File Manager .........................................................................
6– 7
Recall Files......................................................................... 6 – 8
Print ................................................................................... 6 – 9
Delete ................................................................................. 6 – 9
Delete All ........................................................................... 6 – 9
Disk Summary ................................................................. 6 – 10
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Chapter 6 – Data Handling
Data File System
6.1
Data File System
A total of 2000 data files of measurement results can be
stored in memory. However, you can only store up to 500 files
for each software package. Data files are copied from the
buffer. All records are preserved when you turn off the instrument, except for the data in the buffer. Measurements
can be stored automatically (during an Auto Start sequence)
or manually (at any time after a measurement is stopped).
File Names
Measurements are saved in Mediator as files with a file name
that consists of file number and an extension. In addition the
files can be identified by the date and time when the file was
saved.
Example:
001.M26 YYMMDD TTMMSS
File name: Consists of a three digit number from 000 to 500.
Number 000 is used for back-up purposes, for example, in a
power-down situation with flat batteries, the content of the
buffer is saved in no. 000. File numbers are generated automatically as consecutive numbers.
Extension: The following extensions are used to identify the
software package in which the files were made. The two digits
in the extension correspond to the last digits in the type
number:
M26:
M25:
M23:
M24:
Basic SLM Software BZ 7126
Enhanced SLM Software BZ 7125
Frequency Analysis Software BZ 7123
Logging SLM Software BZ 7124
ID: The date and time (YYMMDD TTMMSS) information is
used to identify the files.
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Chapter 6 – Data Handling
Data File System
6.1.1
Saved Data
A basic measurement data file consists of a group of set-up
data and a group of associated measurement data. The setup data are:
●
Serial number for the Mediator
●
Measurement set-up
●
Calibration data
●
Measurement data
Measurement data are:
6.1.2
●
Overall results
●
RMS Broadband data
●
Broad-band Peak data
Set-up Data
Measurement Set-up
All measurement set-up parameters that was used for the
measurement.
Calibration Set-up (for individual measurements)
6.1.3
●
Microphone type
●
Sensitivity
●
Calibration date
Measurement Data
Overall Results
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●
Start date
●
Start time
●
Elapsed time
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Chapter 6 – Data Handling
Selecting the Data Files Menu
●
Overload
●
Under-range
Broadband Data for Detector 1
LFMax, LSMax, LIMax, LFMin, LSMin, LIMin, Leq, LIeq, LAep,d,
LAE, EA, LFav4, LSav4, Dose, FDoseX, SDoseX, AUX1, AUX2
Note: Only the parameters with the selected time weighting
are saved.
Peak Data for Detector 2
6.2
●
Number of peaks
●
LXpkMax
Selecting the Data Files Menu
The Data Files menu is used for saving and printing files
and for accessing the File Manager. It contains the menu
items shown in Fig. 6.1.
Fig.6.1 The Data Files Window
1.
The Data Files Window is accessed by pressing the
Data Files key when the instrument is paused. If the
instrument is measuring you must press
to pause.
Select the desired menu item with the
cursor
keys.
This will also cause the and soft keys
to appear.
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Chapter 6 – Data Handling
Store Files
2.
Press the
softkey to enter the selection.
This will also cause the and soft keys to
appear.
6.3
Store Files
Automatically Saved Files
Measurements that are made with at preset measurement
time are stored automatically with consecutive numbers.
If the Mediator switches off because of flat batteries, the
content of the buffer is saved in file no. 000.
How to Store the Current Measurement Manually
6.4
1.
Press the
urement.
Pause/Continue key to pause the meas-
2.
Press the
menu.
Data Files key to display the Data Files
3.
Press the
softkey or the
cursor key
to store the measurement with the displayed file name.
A “Saving File ...” message is displayed while saving
takes place.
Print Options
Before you print a file or the contents of the buffer, you should
select which measurement parameters you want to print out.
The Print Options list applies to both the Print function
for the buffer as well as the Print function in the File
Manager.
Setting the Print Options
1.
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Select Print Options from the Data Files menu.
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Chapter 6 – Data Handling
Print
2.
3.
6.5
Use the cursor keys to tag the parameters that you want
to print out. Use the
cursor keys to tag (+) or
untag a long list of parameters. Note that parameters
that are already tagged will be de-selected. If you only
want to tag or untag a few parameters, select the desired
parameter with the
cursor keys and tag or untag
with the
cursor keys. The following parameters
can be printed:
●
LMAX
●
LMIN
●
LAFTm5
●
Leq
●
LIeq
●
LAep,d
●
LAE
●
EA
●
Lav4
●
Dose
●
Dose4
●
#Peaks
●
Lpkmax
Press
when you have tagged the desired
parameters.
Print
Simply select the Print option when you have connected the
printer (refer to section 7.1) and set up the desired parameters in Print Options (see above). A “Printing ...” message is displayed while the print file is being transferred.
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Chapter 6 – Data Handling
File Manager
6.6
File Manager
The File Manager is used to give an overview of the data
files in the memory and has options for recalling, printing
and deleting these files. The Disk Summary option shows the
memory status.
File List
When you select the File Manager option from the Data
Files menu, you get at file list similar to the first screen
picture illustrated in Fig. 6.2. A file is identified by the file
Fig.6.2
The File List in the File Manager menu. The list is shown with
both dates and file sizes
name and extension and the date and time it was saved.
Pressing the
Data Files key when the File List is displayed will show the file sizes instead of the dates. A single
file in the Basic module take up approximately 1 kbyte of
memory.
Tagging Files
Use the cursor keys to tag the files that you want to select.
Use the
cursor keys to tag (+) or untag a long list of
files. Note that files that are already tagged will be de-selected. If you only want to tag or untag a few parameters,
select the desired parameter with the
cursor keys
and tag or untag with the
cursor keys.
Note: Whenever you leave the File Manager all file tags
will be deleted.
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Chapter 6 – Data Handling
File Manager
Press the
softkey to show the options in the
File Manager Options Window, see Fig. 6.3.
Fig.6.3 The File Manager Options Window
6.6.1
Recall Files
Select Recall from the File Manager Options Window to
recall all the tagged files from the File List.
Fig.6.4 The Recall Files Window
The Recall Files Window contains the same parameter
fields as the Measurement Window (except for instantaneous
values). The Bar Graph is replaced with a File Number field.
When the basic Recall Files Window is selected, you can
scroll through the recalled files by using the
cursor
keys. The option will print the currently recalled file
with the parameters from the Print Options list.
6.6.2
Print
Select Print from the File Manager Options Window to
print all the tagged files from the File List. The Print Window will appear to show which file is currently being printed.
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File Manager
Fig.6.5 The Print Window
6.6.3
Delete
Select Delete from the File Manager Options Window to
delete all the tagged files from the File List. A delete prompt
will appear to confirm that you want to delete the selected
files. The File List will appear to show the remaining files.
Fig.6.6 The Delete Window
6.6.4
Delete All
Similar to the Delete option above, except that all files
(tagged and untagged) will be deleted.
6.6.5
Disk Summary
Select Disk Summary from the File Manager Options
Window to get an overview of the disk memory.
The following parameters are displayed:
BB1119 – 11
●
Total: Shows the total disk space in kbytes
●
Used: Shows the used disk space in kbytes
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Chapter 6 – Data Handling
File Manager
Fig.6.7 The Disk Summary Window
6 – 10
●
Free: Shows the total free disk space in kbytes
●
Available: Shows the total number of files that can
still be saved for the current application module
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Chapter 7
Printing and Transferring Data
7.1
Output to a Printer .............................................................
7– 2
7.2
Transferring Data to 7815, 7820, 7821 and 7825 .
7– 2
7.3
Aux 1 and Aux 2 Output ...................................................
7– 3
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Chapter 7 – Printing and Transferring Data
Output to a Printer
7.1
Output to a Printer
7.1.1
Setting up for Portable Printer Type 2322
Mediator includes a standard serial port interface. We recommend using Portable Printer Type 2322 as the printing
format has been optimized for this printer. However, it is
possible to use an IBM Proprinter compatible printer.
Connecting Type 2322
1.
Switch off the Mediator and Type 2322 before connecting
the serial interface cable
2.
Connect the 9-pin connector on the cable to the 9-pin
Serial Interface socket on the base of Mediator.
7-15V
Serial Interface
Aux 1 Aux 2
Serial interface socket
960160e
Fig.7.1 Location of the serial interface connector
7–2
3.
Carefully tighten the cable’s connector screws to the
screw holes in the sound level meter.
4.
Connect the round connector on the cable (arrows facing
upwards) to Type 2322.
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Chapter 7 – Printing and Transferring Data
Output to a Printer
Setting up Interface Parameters
Ensure
that
the
interface
parameters
in
Printer Interface Window are set as follows:
7.1.2
✩
Baud Rate: 9600
✩
Handshake: XON/XOFF
the
To Print a Measurement
Connect the printer and set up the interface parameters as
described above. If the printer has not been connected, you
must save the measurement as a file (refer to File Manager
in section 6.6 for printing files) before switching the Mediator
off.
to pause the measurement.
1.
Press
2.
Press the
Window.
3.
Select Print from the menu list. A “Printing ...” message is displayed while data is transferred to the printer.
Data Files key to open the Data Files
Refer to Chapter 6 for details about setting up print options
and printing files.
Measurement Print Format
A Measurement print includes:
BB1119 – 11
1.
Header
2.
Settings (measurement parameters)
3.
Calibration Data (Microphone, Sensitivity and Date)
4.
Overall Results (Start Date/Time, Elapsed Time, Overload and Underrange)
5.
RMS and Peak Measurement Results (selected measurement parameters, see section 6.4)
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7.1.3
Calibration History
Connect the printer and set up the interface parameters as
described above.
to pause the measurement.
1.
Press
2.
Press the
3.
Select Calibration History from the Calibration
menu.
4.
Press the
Calibration key.
Print key to print the Calibration History.
Calibration History Print Format
A Calibration History print includes:
7.2
1.
Header
2.
Calibration History (Date, Time, Sensitivity, Microphone
and Initial Calibration)
Transferring Data to 7815, 7820,
7821 and 7825
Data export to a PC is normally made to one of the application
programs: 7815 Noise Explorer, 7820/7821 Evaluator or
7825 Protector. The procedure for setting up the interface
is identical for these programs. For installation of the application program, refer to the Installation Guide for the respective program.
1.
If the default values have been changed, switch on the
Mediator and set:
✩
Baud Rate: 38400
✩
Handshake: Hardwired
Refer to section 3.1.5.
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Chapter 7 – Printing and Transferring Data
Transferring Data to 7815, 7820, 7821 and 7825
Note: 38400 is the recommended baud rate. Depending
on your system, a higher baud rate may be possible or a
lower transfer rate may be necessary.
2.
Switch off the PC and the Mediator.
Caution: When connecting the Mediator to the PC, ensure that both instruments are switched off. Otherwise
they could be damaged.
3.
Choose a free COM port on the PC. Normally the COM 1
or COM 2 port. Connect the Mediator to the PC via the
9-pin Serial Interface socket on the base of the Mediator
using cable AO 1386. AO 1386 has 9-pin connectors at
each end. A 9-pin to 25-pin adaptor is supplied with the
cable for use with PC’s with 25-pin serial connectors.
4.
Switch on the PC and open the desired application program.
5.
Select the New Measurement option in the Insert
menu to open the Insert New Measurement Window.
6.
Select SLM Type 2238 from the pull-down menu and
click Setup. The Communication Window is displayed.
7.
Set the appropriate COM port and Baud Rate parameters
and click OK.
8.
Click Next> in the Insert New Measurement Window.
If properly connected, the Mediator is automatically
switched on and measurement file data is transferred to
the application program. Otherwise a Communication
Error prompt is displayed. You must check that the cable
is properly connected and that the interface parameters
are set up correctly.
Note: Disconnect the Mediator from the PC after completion
of data transmission. Leaving it connected risks draining the
batteries because it might power on when the PC is switched
off.
BB1119 – 11
2238 Mediator
User Manual
7–5
Chapter 7 – Printing and Transferring Data
Aux 1 and Aux 2 Output
7.3
Aux 1 and Aux 2 Output
Aux 1
The AC signal emitted from the Aux 1 Output socket is Lweighted or weighted with the frequency weighting selected
for Detector 1. It can be used for recording noise signals on
tape, transferring signals to an analyser or listening to the
input on headphones.
Aux 2
A DC level corresponding to the instantaneous RMS (Fast)
level is emitted from the Aux 2 socket at the base of the
sound level meter for recording on a plotter.
7–6
2238 Mediator
User Manual
Brüel & Kjær
Chapter 8
Maintenance and Repair
8.1
Maintenance and Repair ..................................................
8– 2
Care, Cleaning and Storage .............................................. 8 – 2
BB1119 – 11
2238 Mediator
User Manual
8–1
Chapter 8 – Maintenance and Repair
Maintenance and Repair
8.1
Maintenance and Repair
The Mediator is designed and constructed to provide many
years of reliable operation. However, if a fault occurs that
impairs the sound level meter’s correct function, then remove
the batteries to prevent risk of further damage.
For more information about preventing or identifying faults
or damage to your sound level meter, please read the other
sections of this chapter.
For repair, contact your local Brüel & Kjær dealer.
8.1.1
Care, Cleaning and Storage
The Mediator is a precision instrument. When handling, storing, or cleaning your instrument, please take note of the
following precautions:
Storing the Instrument
●
Keep the sound level meter in a dry place
●
For long-term storage, remove the batteries
●
Do not exceed storage temperature limits of –25 to +60°C
(–13 to +140°F)
Cleaning the Instrument
If the instrument casing becomes dirty, then wipe it with a
cloth lightly dampened with water. Do not use abrasive
cleansers or solvents. Do not allow moisture to enter the
microphone, connectors, or casing.
Handling the instrument
8–2
●
Do not try to remove the microphone grid, you can easily
damage the microphone in this way
●
Do not attempt to open the instrument. There are no
user-serviceable parts inside. If you think your instru-
2238 Mediator
User Manual
Brüel & Kjær
Chapter 8 – Maintenance and Repair
Maintenance and Repair
ment requires service,
Brüel & Kjær dealer
BB1119 – 11
then
please
contact
your
●
Do not allow the instrument to get wet
●
Never mix different makes or types of battery
●
Never mix new and old batteries
●
Do not allow fully discharged batteries to remain inside
the instrument
●
Protect the instrument from impact. Do not drop it.
Transport it in the supplied Shoulder Bag (KE 0323)
●
Avoid large, sudden changes in temperature and humidity. Especially when there is risk of condensation inside
the Mediator, for example, if it is very cold and you
subject it to a hot and humid environment.
2238 Mediator
User Manual
8–3
8–4
2238 Mediator
User Manual
Brüel & Kjær
Chapter 9
Specifications
BB1119 – 11
2238 Mediator
User Manual
9–1
Chapter 9 – Specifications
Linear Operating Ranges (worst Case Aweighted):
9.1 Specifications
(2238–A and 2238–A–F)
Mediator Type 2238 conforms with both the existing Sound Level Meter Standards and with the
more comprehensive and more stringent IEC 1672
(draft) standard. For the new standard some specifications are different, and some additional specifications are required
The different/additional specifications can be found
in section 9.3
For the individual level ranges, at 1kHz, the nominal upper boundary levels minus the lowest sound
pressure level measurable with a noise margin of
5 dB.
With a Microphone Type 4188 of nominal sensitivity:
Upper
limit
Lower
limit
Max. peak
level
Upper limit
(CF = 10)
140 dB
60 dB
143 dB
123 dB
Specifications apply to the 2238 Mediator fitted
with the supplied microphone and preamplifier and
running Basic SLM Software (supplied with each
2238 Mediator)
Note: All references to 1/3-octave bands or 1/1octave bands apply only to the Type 2238 – A – F.
130 dB
50 dB
133 dB
113 dB
120 dB
40 dB
123 dB
103 dB
110 dB
30 dB
113 dB
93 dB
100 dB
25 dB
103 dB
83 dB
90 dB
25 dB
93 dB
73 dB
Standards:
80 dB
25 dB
83 dB
63 dB
General Specifications:
Conforms with the following:
• EN 60651/IEC 651 (1979) Type 1 plus Amendment 1
• EN 60804/IEC 804 (1985) Type 1 plus Amendment 2
• Draft IEC 1672/EN 61672 — March 1998,
Class 1
• ANSI S1.4 (1983) Type S 1
• ANSI S1.43 – 199X Type 1 (Draft 1993)
Inherent Noise level:
Inherent noise is the combination of the electrical
noise and the thermal noise from the microphone
at 20°C. Typical values with supplied microphone
of nominal sensitivity (in dB) are given in the table
below and in Fig. 9.1 and Fig. 9.2:
Weighting
Electrical
noise
(2238)
Thermal
noise
(4188)
Combine
d Noise
"A"
14
14.5
17.4
"C"
17
13.2
18.5
Lin. 5 Hz –
20 kHz
22
14.2
23
Supplied Microphone:
Type 4188 Prepolarized Free-field 1/2″ Condenser
Microphone
Nominal Sensitivity: – 30 dB re 1 V/Pa or
31.6 mV/Pa
Capacitance: 12 pF (at 250 Hz)
Supplied Microphone
Preamplifier:
ZC 0030
Input Impedance: 10 GΩ||0.2 pF
Extension Cables: Available in lengths of 3 m and
10 m. No recalibration is required
Measuring Range:
At 1kHz, the difference between the nominal upper boundary level on the least sensitive level
range and the lowest sound pressure level measurable on the most sensitive level range.
A-weighted: 25 to 140 dB
C-weighted: 27 to 140 dB
Lin.: 33 to 140 dB
9–2
Primary Indicator Range:
The upper limit of each Primary Indicator Range
is the same as the upper limit for CF (crest factor)
= 10 of each range setting. The lower limit is either
the upper limit – 80 dB or one of the following values, whichever is highest
2238 Mediator
User Manual
Linear
C-weighted
A-weighted
38 dB
32 dB
30 dB
Brüel & Kjær
Chapter 9 – Specifications
Indicator Range:
0 to – 80 dB relative to upper limit for each range
setting
Frequency Weighting:
Fig. 9.3 shows the curves for the A, C and L frequency weightings The microphone response is
not included
Stored
Instantaneous
(display only)
LXeq
LXYp
LXYav4
LXYInst
LXYav5
LVpk
LAE
Resolution:
LAep,d
Discrete parameters: 0.1 dB
Broad-band Statistics: 0.5 dB
EA
Detectors:
LXYmax
Simultaneous detection of RMS and Peak with
independent frequency weightings
LXYmin
LXpkmax
RMS Detectors
Time Weighting: The RMS detector facilitates
three exponential time weightings (Fast, Slow, Impulse) according to IEC 651 Type 1 (factory
checked to meet Type 0).
Frequency Weightings: A, C or L (also 1/1 and
1/ -octave bands with 2238 – A – F)
3
Tone Burst Response: See Fig. 9.4
Number of Peaks
Dose%A
Dose% AY4
Dose% AY5
Peak detector:
Overload%
L-weighting: Conforms to IEC 651 and IEC 1672
C-weighing: Conforms to IEC 1672
Rise Time <100 µs (L-weighting)
Underrange%
Elapsed Time
Overload detector
Start Time
Monitors all signal paths
Start Date
Frequency Response:
The effect of the Mediator's casing on the frequency response is shown in Fig. 9.5. The frequency
and directional responses of the Mediator are
shown in Fig. 9.6, Fig. 9.7and Fig. 9.8)
Measurements:
The available measurement parameters are listed
in the table. RMS and Peak measurements run in
parallel with individual frequency weightings
Symbol Key (for measurement
parameters):
X: Frequency weighting A, C or L
V: Frequency weighting C or L
Y: Time weighting F, S or I
Measurement Control:
Manual control, or pre-set measurement time in
the range 30 s to 99 h, 59 m, 59 s with automatic
storage of measurement
BB1119 – 11
Time
Auto Start:
The Mediator supports four Auto Starts which allow set-up of measurement start times up to a
month in advance
Reference Conditions for
Acoustic Calibration:
Using Sound Level Calibrator Type 4231 or Multifunction Acoustic Calibrator Type 4226
Type of Sound Field: Free-field
Reference Direction of Sound Incidence:
Frontal, perpendicular to microphone diaphragm.
Reference Sound Pressure Level: 94 dB
Reference Frequency: 1 kHz
Reference Temperature: + 20°C (+ 68°F)
Reference Measuring Level Range: 50 – 130 dB
(automatically set during calibration sequence)
Calibration Correction with Extension Cable:
0 dB
2238 Mediator
User Manual
9–3
Chapter 9 – Specifications
Calibration History: 20 most recent calibrations.
The initial calibration value is stored for comparison with later calibrations
Serial Interface:
Handshake: Hardwired, Modem
Printer Interface:
Handshake: XON/XOFF, Hardwired
Display:
128 × 64 dot matrix display with backlight
Measurement Display: Range and quasi-analogue bar graph, plus four measurement parameters that can be freely selected from all available
parameters during measurements
Memory:
2 Mbytes. Up to 500 measurement files can be
stored, including time stamp, complete set-up and
calibration data
Serial Printer:
Measurement data can be printed on Portable
Printer Type 2322 or on an IBM Proprinter-compatible printer.
Measurement data can be output as a binary file
for post-processing on a PC
Aux 1 Output:
Connector: 2-pin LEMO
AC Output Signal: Range-adjusted AC output, Lweighted or with the frequency weighting selected
on the RMS detector. Short-circuit protected
Output: 1 V RMS corresponding to full-scale indication
Max. Load: 10 kΩ || 1 nF
Output Impedance: Typically 100 Ω
Aux 2 Output:
Connector: 2-pin LEMO
DC Output Signal: DC version of signal on RMS
detector 1 ( Fast, Inst). Delayed 0.8 s. Short-circuit
protected
Output: 0 to 4.0 V DC, (50 mV/dB)
Update Rate: 160 times per second
Max. Load: 10 kΩ || 1 nF
Output Impedance: Typically 100 Ω
Settling Time:
From Power On: < 10 s
Environmental Effects:
Storage Temperature: – 25 to + 70°C (– 13 to
+ 158°F)
Operating Temperature: – 10 to + 50°C (14 to
122°F)
Effect of Temperature: < 0.5 dB (– 10 to + 50°C)
Effect of Humidity: < 0.5 dB for 30% < RH < 90 %
(at 40°C, 1 kHz)
Batteries:
Four 1.5 V LR6/AA alkaline cells
Lifetime (at room temperature): Typically
> 10 hours. Automatic switch-off when battery voltage sinks below threshold, to avoid invalid measurements
Indicator: Warning on display when less than 15
minutes of lifetime is remaining
Internal Back-up Battery: Keeps clock and data
files operating for at least 6 months (typically) if
fully charged. The back-up battery is charged from
the main batteries. Charging time: approx. 10
hours
External DC Power Supply:
Voltage: Regulated 7 to 15 V
Voltage Ripple: < 20 mVpeak to peak
Power: Approximately 150 mA at 7 V (approx.
210 mA with filter set)
Centre Pin: Positive
Weight and Dimensions:
460 g (with batteries), 257 × 97 × 41 mm
Language:
Clock:
Each instrument is loaded with English, German,
French, Italian and Spanish text. You can select
any of these languages at any time
Real-time (calendar)
Serial Input/Output:
Conforms to EIA/TIA 574 (RS – 232), coupled as
Data Terminal Equipment (DTE). Cable (AO 1386)
is supplied with the Mediator
Connector: 9-pin D-type male
Baud Rates: 4800, 9600, 19 200, 38400 and
115 200
Word Length: 8 bits, no parity, 1 stop bit
9.2 Additional Specifications for
2238 – A – F (Version with
Filter Set Installed)
Standards:
Conforms with the following:
9–4
2238 Mediator
User Manual
Brüel & Kjær
Chapter 9 – Specifications
• EN 61260/IEC 1260 (1995) Octave and 1/3-octave Bands Class 1
• ANSI S1.11 – 1986 Octave and 1/3-octave
Bands, Order 3, Type 1-D. Optional Range
Octave and 1/3-octave Band
Filters:
Range of Integration Time:
Time Averaged Sound Levels and Sound Exposure Levels can be measured over time intervals
ranging from 1 s to > 10 months (month of 31 days)
Inherent Noise:
Conform to IEC 1260 (1995) and ANSI S1.11 –
1986.
Frequency Rating System: Base 10
Reference Attenuation: 0 dB
Linear Operating Range: As Indicator range
Nominal Octave Band Centre Frequencies:
31.5 Hz, 63 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz,
2 kHz, 4 kHz, 8 kHz
Nominal 1/3-octave Band Centre Frequencies:
20 Hz, 25 Hz, 31.5 Hz, 40 Hz, 50 Hz, 63 Hz, 80 Hz,
100 Hz, 125 Hz, 160 Hz, 200 Hz, 250 Hz, 315 Hz,
400 Hz, 500 Hz, 630 Hz, 800 Hz, 1 kHz, 1.25 kHz,
1.6 kHz, 2 kHz, 2.5 kHz, 3.15 kHz, 4 kHz, 5 kHz,
6.3 kHz, 8 kHz, 10 kHz, 12.5 kHz
Batteries:
Typical time averaged sound levels for integration
times of 1 minute are shown in Fig. 9.1 and Fig. 9.2
for a Mediator fitted with a microphone Type 4188
of nominal sensitivity and exposed to a very low
sound level.
Broad Band values for Fast and Slow time weighted measurements are:
*
Weighting
Fast
Slow
A
< 20 dB
< 20 dB
C*
21 dB
20 dB
Lin*
24 dB
23 dB
Average of 10 readings taken randomly over a
time interval of 1 minute
Lifetime (at room temperature): With filter selected: Typically > 7 hours
Test Information:
9.3 Specifications According to
IEC 1672 (2238–A and
2238–A–F)
Microphone Reference Point: 1.3 mm behind the
front of the protection grid.
During test the microphone signal can be substituted by an electrical signal input to an adapter
WA 0302 (13 pF) which replaces the microphone.
For a calibration factor of 0 dB the relationship
between applied voltage and reading in SPL follows the table below
Steady Level Linearity at 1kHz:
This is the nominal upper boundary levels minus
the lowest sound pressure level that can be measured with maximum 0.3 dB unlinearity within a
10 dB step. Unlinearity is due to inherent noise,
which must be at least 13 dB below the lower limit.
Inherent noise is the combination of the electrical
noise and the thermal noise from the microphone
at 20°C. See Fig. 9.1 and Fig. 9.2.
For any level range, the upper limit is the upper
boundary of the range. The lower limit is either
the upper limit –80 dB, or one of the following
values, whichever is highest:
Linear
C-weighted
A-weighted
41 dB
35 dB
33 dB
34 mV
6.76 V
SPL
94 dB
140 dB
Note: Due to stray capacitance an attenuation of
0.6 dB may result with WA 0302
Input Voltage Maximum: 15 Vpeak-peak
EMC
Classification Group: X
Reference Direction for Testing Radio Frequency Susceptibility: Microphone facing antenna
9.4 Effect of Accessories:
Peak-C Ranges:
For any range, the upper limit is the upper boundary of the range + 3 dB. The lower limit is either
the upper limit – 63 dB, or 60 dB (LVpk (V = frequency weighting L or C)), whichever is highest
BB1119 – 11
Applied Voltage
Fig. 9.16, Fig. 9.17 and Fig. 9.18 show the typical
effect of various accessories on the frequency response of Mediator
2238 Mediator
User Manual
9–5
Chapter 9 – Specifications
CE-mark indicates compliance with: EMC Directive.
EMC Emission
EN 50081 – 1: Generic emission standard. Part 1: Residential, commercial and light
industry.
EN 50081 – 2: Generic emission standard. Part 2: Industrial environment.
CISPR 22: Radio disturbance characteristics of information technology equipment.
Class B Limits.
FCC Rules, Part 15: Complies with the limits for a Class B digital device.
EMC Immunity
EN 50082 – 1: Generic immunity standard. Part 1: Residential, commercial and light
industry. RF immunity implies that sound level indications of 50 dB or greater will
be affected by no more than 0.5 dB.
EN 50082 – 2: Generic immunity standard. Part 2: Industrial environment. RF immunity implies that sound level indications of 65 dB or greater will be affected by
no more than 0.5 dB.
These levels of immunity are 9 dB better than required by IEC 1672.
Note: The above conformance is guaranteed only when using the included/optional accessories.
Brüel & Kjær reserves the right to change specifications and accessories without notice
Noise
Level
(dB)
,
,
,
,
,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,,,
25
Electrical Noise
Thermal Noise
Combined Noise
20
15
10
5
0
-5
-10
-15
-20
25
40
63
100
160
250
400
630
1k
Centre Frequency
Fig.9.1
9–6
2.5k
4k
6.3k
10k
A
C
Lin
980280
The three components of inherent noise in each 1/3-octave band and in the
broad bands A, C and L (5 Hz – 20 kHz)
2238 Mediator
User Manual
Brüel & Kjær
Chapter 9 – Specifications
Noise
Level
(dB)
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
25
Electrical Noise
Thermal Noise
Combined Noise
20
15
10
5
0
-5
-10
-15
31,5
63
125
250
500
1000
2000
Centre Frequency
Fig.9.2
BB1119 – 11
4000
8000
A
C
Lin
980281
The three components of inherent noise in each octave band and in the
broad bands A, C and L
2238 Mediator
User Manual
9–7
Chapter 9 – Specifications
Relative Response
(dB)
2
L
0
A
L
C
C
–5
– 10
– 15
5
10
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency (Hz)
Fig.9.3
50k
980385e
Curves for the A and C and L weightings. The curves do not include the
microphone response
Response
(dB)
0
-5
-10
-15
-20
Fast
-25
Slow
-30
Impulse
-35
-40
0,1
1
10
Duration (ms)
Fig.9.4
9–8
100
1000
980279e
Curves showing the detector response of Mediator to 4 kHz tone bursts of
various durations
2238 Mediator
User Manual
Brüel & Kjær
Chapter 9 – Specifications
1
Relative
Response
(dB)
0
–1
100
200
500
1k
2k
10k
5k
20k
Frequency (Hz) 931236/2e
Fig.9.5 Effect of Mediator’s casing on frequency response
Relative Response (dB)
4
3
2
1
0
-1
-2
-3
-4
-5
10
100
1000
Frequency (Hz)
Fig.9.6
BB1119 – 11
10000
20000
980283
Free-field frequency response of Mediator fitted with the supplied microphone Type 4188. IEC 651 Type 1 tolerances are also shown
2238 Mediator
User Manual
9–9
Chapter 9 – Specifications
Relative Response (dB)
4
3
2
1
0
-1
-2
-3
-4
-5
10
100
1000
10000
20000
Frequency (Hz)
980282
Fig.9.7
9 – 10
Random incidence frequency response of Mediator (random incidence filter
selected) fitted with the supplied microphone Type 4188. IEC 651 Type 1
tolerances are also shown
2238 Mediator
User Manual
Brüel & Kjær
Chapter 9 – Specifications
Kjæ
r
30
10
0
2 kHz
0
20
10
30
20
40
30
50
270
40
20
10
0
4 kHz
0
0
0
0
21
15
0
15
10
12
21
Kjæ
r
Brüel
&
180
180
20
0
15
0
0
Brüel
& Kj
ær
Kjæ
r
0
Brüel
& Kj
ær
0
Brüel
& Kj
ær
Brüel
&
30
180
0
24
12
0
24
0
40
0
30
QP 5
102
21
40
QP 5
102
QP 5
102
0
24
50
270
12
50
90
1 kHz
50
90
0
0
10
10
20
20
30
5dB
30
40
40
QP 5
102
QP 5
102
0
50
90
60
QP 5
102
30
60
0
60
50
270
30
0
0
33
30
0
33
30
0
33
30
Brüel
& Kj
ær
0
Brüel
&
0
0
Brüel
& Kj
ær
30
33
0
30
0
33
30
60
0
40
30
20
10
0
8 kHz
50
90
0
50
270
40
30
20
10
0
12.5
kHz
0
10
10
20
20
30
30
40
40
50
270
50
90
QP 5
102
QP 5
102
0
60
30
QP 5
102
QP 5
102
0
0
0
24
12
0
0
24
12
0
15
0
.... 120+
OVL
02:00:00
F MaxL 83·6 dBA
180
21
15
0
21
180
Brüel
& Kj
ær
0
40
Brüel
& Kj
ær
Brüel & Kjær
K
B
98'-6/7
2238 Mediator
980386/1e
Fig.9.8
BB1119 – 11
Directional characteristics of the Mediator fitted with the supplied microphone Type 4188. Characteristics measured at 1, 2, 4, 8 and 12.5 kHz
2238 Mediator
User Manual
9 – 11
Chapter 9 – Specifications
Response
(dB)
10
0
-10
-20
-30
-40
-50
-60
-70
-80
0,1
0,01
1
10
100
Multiple of Centre Frequency
980289
Fig.9.9
Curves showing the shape of the octave-band filters (from 0 to –80 dB).
IEC 1260 tolerances are also shown
Response
(dB)
1
0
-1
-2
-3
-4
-5
0,5
1
Multiple of Centre Frequency
Fig.9.10
9 – 12
2
980286
Curves showing the shape of the octave-band filters (from 0 to –3.5 dB).
IEC 1260 tolerances are also shown
2238 Mediator
User Manual
Brüel & Kjær
Chapter 9 – Specifications
Response
(dB)
10
0
-10
-20
-30
-40
-50
-60
-70
-80
1
0,1
10
Multiple of Centre Frequency
Fig.9.11
Response
(dB)
980288
Curves showing the shape of the 1/3- octave-band filters (from 0 to –80 dB).
IEC 1260 tolerances are also shown
0
-1
-2
-3
-4
0,85
0,9
0,95
1
1,05
1,1
1,15
Multiple of Centre Frequency
980287
Fig.9.12
BB1119 – 11
Curves showing the shape of the 1/3-octave-band filters (from 0 to –4 dB).
IEC 1260 tolerances are also shown
2238 Mediator
User Manual
9 – 13
Chapter 9 – Specifications
140
130
120
110
A
100
C
Lin
90
80
70
60
50
40
30
1
10
100
1000
10000
100000
980314e
Fig.9.13
9 – 14
Maximum sound pressure levels that can be measured within tolerance limits of IEC 1672, A- and C-weighted and L
2238 Mediator
User Manual
Brüel & Kjær
Chapter 9 – Specifications
Correction (dB)
3
– 40kPa
change
2
– 20kPa
change
1
– 10kPa
change
0
–1
500
1k
10k
Frequency (Hz)
50k
940762e
Fig.9.14
BB1119 – 11
Typical variation in frequency response (normalized at 250 Hz) as a function of change in ambient pressure, relative to 101.3 kPa (Type 4188)
2238 Mediator
User Manual
9 – 15
Chapter 9 – Specifications
Response (dB)
1.5
1.0
– 10°C
0.5
0.0
– 0.5
50°C
– 1.0
– 1.5
500 Hz
1k
10 k
Frequency (Hz) 50 k
940806/1e
Fig.9.15
Typical variations in frequency response as a function of temperature, relative to the response at 20°C (Type 4188)
1
Relative
Response
(dB)
0
–1
100
200
500
1k
2k
5k
20k
10k
Frequency (Hz) 931234/1e
Fig.9.16 Influence of Protective Cover UA 1236 on Mediator's frequency response
9 – 16
2238 Mediator
User Manual
Brüel & Kjær
Chapter 9 – Specifications
Response (dB)
1,0
0,0
-1,0
Influence of windscreen
Windscreen with correction filter
-2,0
-3,0
1000
100
10000
Frequency (Hz)
980285
Fig.9.17
Influence of Windscreen UA 0237 on Mediator’s frequency response, with
and without the windscreen correction filter
1
Relative
Response
(dB)
0
–1
100
200
500
1k
2k
5k
20k
10k
Frequency (Hz) 931235/1e
Fig.9.18 Influence on Mediator’s frequency response when mounted on Tripod UA 1251
BB1119 – 11
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9 – 17
9.5 Accessories Included:
Type 4188:
ZC 0030:
AO 1386:
KE 0323:
UA 1236:
QB 0013:
Prepolarized Free-field 1/2″
Condenser Microphone
Microphone Preamplifier
9-pole Cable with 25-pole Adaptor (for computer and serial
printer)
Shoulder Bag
Protective Cover
4 Alkaline Batteries
9.6 Optional Accessories
AO 0560/0409:
AO 0561/0408:
ZG 0386
ZG 0387
ZG 0388
9 – 18
Microphone Extension Cable
(10 m)
Microphone Extension Cable
(3 m)
Power Supply (European version)
Power Supply (UK version)
Power Supply (US version)
2238 Mediator
User Manual
Brüel & Kjær
Chapter 10
Appendix 1: General
10.1 Exchange Rate ....................................................................
10 – 2
10.2 List of Default Parameters ...........................................
10 – 4
10.3 Interface Errors ..................................................................
10 – 6
10.4 Messages and Warnings .................................................
10 – 8
10.5 Error messages .................................................................
BB1119 – 11
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10 – 12
10 – 1
Chapter 10 – Appendix 1: General
Exchange Rate
10.1 Exchange Rate
When measuring noise for the evaluation of hearing risk, the
time factor has an important influence.
It is generally assumed that doubling the noise energy also
doubles the hearing risk. This means that if the noise energy
is doubled (i.e. it increases by 3 dB) the allowed exposure time
should be halved.
Thus, as the equal energy concept requires a halving of the
exposure time for a 3 dB increase in level (Leq), it is said to
have an Exchange Rate of 3 dB. This is standardized by ISO.
However, in the USA, the OSHA regulation allows a 5 dB
increase in level for each halving of the exposure time (i.e.
the Exchange Rate is 5 dB). It therefore uses an Lav with
this Exchange Rate. This Lav5 (or LOSHA) has a different
relationship between level and time than the equal energy
concept standardized by ISO.
This is shown in Fig. 10.1. Going from an exposure time of
8 hours to 4 hours allows an increase of 3 dB in the Leq in
accordance with ISO, but an increase of 5 dB in the LAV5 in
accordance with OSHA.
An Exchange Rate of 4 dB also exists (Lav4 or LDOD).
Leq and LEP,d are always measured based on a 3 dB Exchange
Rate. The second Exchange Rate (4 or 5 dB) determines
whether Lav4 or Lav5 is measured.
10 – 2
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User Manual
Brüel & Kjær
Chapter 10 – Appendix 1: General
Exchange Rate
Leq
dB(A)
105
100
OSHA
ISO
95
93
90
1
2
4
8h
t
860884e
Fig.10.1 The effect of an Exchange Rate of 3 or 5 dB
Exchange Rate (dB)
Parameter
3
Leq and Lep,d (always measured)
4
Lav,4 (LDOD)
5
Lav,5 (LOSHA)
Table 10.1 The LAV parameter measured by the sound level meter is dependent on the Exchange Rate
BB1119 – 11
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10 – 3
Chapter 10 – Appendix 1: General
List of Default Parameters
10.2 List of Default Parameters
Menu
Set-up Parameter
Default Value
Range
30 – 110 dB
Peaks Over
140 dB
2nd Exch. Rate
4 dB
Bandwidth (Detector 1)
Broad Band
Freq. Wgt. (Detector 1)
A (“F”)
Weighting (Detector 2)
Peak
Sequence
Off
Sound Incidence
Frontal
Windscreen Filter
Off
Aux 1
AC Output
Aux 2
DC Output
Auto Start No.
1
Owner
None
Exposure Time
7:30 (2700 s)
Criterion
100 dB
Threshold
0 dB
Save Setup
Save in No.
1
Recall Setup
Recall From No.
Default
Baud Rate (printer)
9600
Handshake (printer)
XON/XOFF
Baud Rate (remote)
9600
General
Weightings
Meas. Control
Corr. Filters
Input/Output
Auto Start
Occ. Health
Interface
Language
10 – 4
English
2238 Mediator
User Manual
Brüel & Kjær
Chapter 10 – Appendix 1: General
Messages and Warnings
Menu
Display
Set-up Parameter
Default Value
Contrast Adjust
2
10.3 Messages and Warnings
If you get a message or warning while using or calibrating
your Mediator, then refer to the chart below.
Message
Performing
calibration check
Please wait
Saving
Please wait
Warning
Measurement will
be reset.
Continue?
BB1119 – 11
Occurs
Solution
When a calibration is
executed
Wait until the calibration is finished
When a new
calibration sensitivity
value has been
accepted
Wait until the new
value has been
saved
When a measurement
has been in progress
for more than 1 minute
and you are about to
delete the measurement data if you:
1: Change the measurement range.
2: Make changes to
the measurement setup.
3: Make a calibration
Normal situation to
avoid deleting the
measurement.
Press “OK” if measurement data should
be deleted or “Cancel” if you want to
continue the measurement
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Chapter 10 – Appendix 1: General
Messages and Warnings
X files needed
Y files available
Continue anyway
When a measurement
sequence is set up and
the required number of
files for the sequence
exceeds the number
available in memory
Reduce the number
of measurements in
the sequence or
save some of the
files in memory on a
PC.
Saving file
When a file is being
saved
Wait until the file is
saved
When the selected
files are being deleted
Wait until the files
have been deleted
Delete selected
file(s)?
Before a number of
selected files are being
deleted
Normal situation to
avoid deleting files
accidentally. Press
“OK” to delete the
files or press “Cancel” to skip deleting
the files
Deleting all
files ...
When “Delete All” has
been activated and the
files are being deleted
Wait until all the files
have been deleted
Warning
Deleting selected
file(s) ...
10 – 6
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User Manual
Brüel & Kjær
Chapter 10 – Appendix 1: General
Messages and Warnings
Delete all files?
No tagged files!
To tag files use
left or right arrow
in the file manager
Disk summary
X kbytes total
Y kbytes use
Z kbytes free
Q files available
Printing ...
Cancelling ...
BB1119 – 11
Before all files are
deleted when “Delete
All” has been selected
Normal situation to
avoid deleting files
accidentally. Press
“OK” to delete all
files or press “Cancel” to skip deleting
all files
An operation has been
activated that requires
that a number of files
are tagged
Tag the desired files
When “Disk Summary”
in the File Manager
has been selected
Shows an overview
of disk space and
files available
When Print has been
selected in the Data
Files Window or in the
Print Manager. The file
name for the file that is
being printed is shown
in the second line if
Print has been
selected in the File
Manager
Wait until the files
are printed or press
“Cancel” to stop
printing
When a print operation
is cancelled
Normal situation
when a print operation is cancelled
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Chapter 10 – Appendix 1: General
Interface Errors
Change
application?
When the application
module is changed
and measurement
data has not been
saved
Normal situation to
avoid loosing measurement data. Press
“OK” to change
application and
loose data or press
“Cancel” to return to
the current application module and
save data
10.4 Interface Errors
Message
Description
Number
Header not
found
An unknown header was supplied to
the Mediator
1
Illegal data
type
The current interface message
requires a different data type
2
Parameter error
The received interface message was
ambiguous
3
Char data not
found
An unknown character data was
supplied to the Mediator
4
Suffix data not
found
An unknown suffix was supplied to
the Mediator
5
Nr string to
long
The supplied numeric string is too
long
6
Nr out of range
The supplied numeric exceeds the
legal range for the data type
7
Non-decimal out
of range
The supplied binary, octal or hex
coded numeric exceeds the legal
range for the data type
8
10 – 8
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User Manual
Brüel & Kjær
Chapter 10 – Appendix 1: General
Interface Errors
Message
Description
Number
String too long
The supplied string is too long
9
Block data too
long
The supplied block data exceeds
max length of block
10
Too many
parameters
The supplied interface message
contains more parameters than
allowed
11
Out of memory
System error. Mediator was unable
to allocate enough memory to handle
the interface message used. Use
less complex interface commands
12
Output is
cancelled
The response to the previous query
message was not read from the
Mediator
13
Deadlocked
The Mediator interface is in a
deadlock condition caused by input
buffer full, parser blocked, response
formatter blocked and output buffer
full. Avoid this by always reading the
response to a query before supplying
the Mediator with new interface
commands. Switch the Mediator off
and on again to exit the deadlocked
condition.
14
Unexpected byte
An unexpected byte was detected
when something else was expected.
For example a space was detected
instead of a message terminator
15
Unexpected END
detected
An unexpected LF (decimal 10)
message terminator was detected.
For example a “;” or a “+” followed
by LF will cause an interface error
16 because these jobs are not
correctly finished
16
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Chapter 10 – Appendix 1: General
Interface Errors
Message
Description
Number
Interface
overrun
Interface messages were received at
a rate faster than the Mediator can
processes them. This caused an
internal input buffer overrun
21
Interface
handshake error
An interface handshake error was
detected. Reset the Mediator and try
again
22
Illegal key
number used
An unspecified key number has been
selected
Setup during
measurement
The set-up cannot be changed while
a measurement is proceeding
No Filter
installed
An octave or 1/3-octave filter has
been specified and no filter set is
installed
Autostart not
applicable
The specified Auto Start is not
allowed. The Auto Start has not been
set up with the current application
module or the date is out of range
File write
error
An error has occurred while storing
data
Illegal value
The specified value is out of range
Setup during
measurement
Mediator was in measurement mode
when you tried to change the set-up.
Change to pause mode
23
No filter
installed
You tried to set up a measurement
parameter that requires the filter set
24
Date out of
range
Normally occurs when the date for
an Auto Start is not valid
25
10 – 10
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User Manual
Brüel & Kjær
Chapter 10 – Appendix 1: General
Error messages
Message
Description
Number
Auto Start not
applicable
There is an error in the set-up for
the specified Auto Start
26
File write
error
Will not normally occur. The
measurement file is corrupt or the
instrument is defect
27
Illegal value
The specified value is not allowed
28
10.5 Error messages
If you get an error message while using or calibrating your
Mediator, then refer to the chart below.
Message
Calibration error
Unstable input
signal
BB1119 – 11
Occurs
Solution
During calibration. For
example, if foreign
sounds have corrupted
the calibration signal
or if the calibrator is
not switched on.
Make sure you have
turned on and fitted
the calibrator correctly. Check the
calibrator’s batteries, and/or move to
a quieter location.
Alternatively use
114 dB calibration
level. If the error
persists, then contact your
Brüel& Kjær dealer.
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User Manual
10 – 11
Chapter 10 – Appendix 1: General
Error messages
Message
Calibration error
New sens. exceeds
acceptance range
±1.5 dB
Detector error!
See error details
in User Manual
Calibration error!
Calibrator level
too high
Calibration error!
Calibrator level
too low
10 – 12
Occurs
Solution
During calibration, if
the instrument has discovered that the
required calibration
level is more than
±1.5 dB from the factory calibration (the
“Initial Sens.” value).
Return to the Calibration Window and
enter a calibration
level that is within
the acceptable
range. Make sure
you have selected
the correct calibration level on your
calibrator. If the error
persists, then you
may need a new
factory calibration.
Contact your
Brüel & Kjær dealer
for assistance.
The output from bothdetectors are compared and the
difference is outside
the acceptable range
Try to calibrate
again. If the error
message persists
your Mediator is
faulty and must be
repaired. Contact
your local
Brüel & Kjær dealer
The calibrator level is
above the maximum
specified dynamic
range (Only with an
unspecified transducer)
Reduce the calibration level and perform calibration
again
The calibrator level is
below the maximum
specified dynamic
range (Only with an
unspecified transducer)
Increase the calibration level and perform calibration
again
2238 Mediator
User Manual
Brüel & Kjær
Chapter 11
Appendix 2: Interface
11.1 Controlling Mediator via the Serial Interface......
11 – 3
Introduction ..................................................................... 11 – 3
11.2 Formats for Interface Messages .................................
11 – 4
Terminology for Interface Messages...............................
Use of Syntax Diagrams..................................................
General Rules for Constructing an Interface Message .
Mnemonic Codes..............................................................
Message Terminator........................................................
11 – 4
11 – 6
11 – 7
11 – 8
11 – 9
11.3 Types of Data .......................................................................
11 – 9
11.4 Character Data .................................................................
11 – 10
Numeric Data ................................................................ 11 – 10
String Data .................................................................... 11 – 12
11.5 Information Protocol ......................................................
11 – 13
Introduction ................................................................... 11 – 13
Header............................................................................ 11 – 13
BB1119 – 11
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11 – 1
Chapter 11 – Appendix 2: Interface
11.6 Setting up the PC ............................................................
Commands .....................................................................
Bandwidth .....................................................................
Continue.........................................................................
Error? .............................................................................
File .................................................................................
Frequency_Weighting_1 ...............................................
Frequency_Weighting_2 ...............................................
Header............................................................................
Identify? .........................................................................
Key .................................................................................
PArameter? ....................................................................
PAUse ............................................................................
RAnge.............................................................................
REset..............................................................................
SEtup .............................................................................
STatus? ..........................................................................
SYstem ...........................................................................
Version ...........................................................................
11 – 2
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11 – 16
11 – 17
11 – 18
11 – 18
11 – 19
11 – 23
11 – 25
11 – 26
11 – 26
11 – 27
11 – 29
11 – 32
11 – 32
11 – 34
11 – 34
11 – 39
11 – 40
11 – 41
Brüel & Kjær
Chapter 11 – Appendix 2: Interface
Controlling Mediator via the Serial Interface
11.1 Controlling Mediator via the
Serial Interface
11.1.1 Introduction
This chapter describes the operation of the Mediator via its
serial interface. It assumes that you are familiar with the
manual operation of the sound level meter and have some
interface programming experience.
Echo
All characters sent via the interface to Mediator are echoed
back to the controller, exactly as entered.
Switching on
To avoid accidentally switching Mediator on, the following
procedure must be observed when it is desired to switch the
Mediator on via the interface.
BB1119 – 11
●
The baud rate and handshake parameters must be set
to the same for Mediator and the controller (refer to
section 3.1.5)
●
The first character that is transmitted will activate the
Mediator
●
Within a short period (8 to 10 seconds) the Mediator must
receive more than 4 additional characters to switch on.
If no further characters are received within this period
it will not be switched on. Use the Echo facility to verify
that the Mediator is switched on. Send a character/command via the interface until the character/command is
echoed back.
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Chapter 11 – Appendix 2: Interface
Formats for Interface Messages
11.2 Formats for Interface Messages
11.2.1 Terminology for Interface Messages
The data transmitted to and from a Mediator conforms to a
subset of the ANSI/IEEE Standard, IEEE 488.2 (1987), “IEEE
Standard Codes, Formats, Protocols and Common Commands”.
Data that is transferred to or from a Mediator, via the serial
interface, is referred to as a “message”. Two types of message
can be sent to the Mediator, “command” and “query” messages. Messages output by the Mediator replying to a query
message from a controller are referred to as “response” messages.
Messages to the Mediator
The interface messages are designed according to the ANSI/
IEEE Std 488.2 (1987), “IEEE Standard Codes, Formats, Protocols and Common Commands”, allowing for compound messages.
Messages that include both a message header and a message
sub-header are called compound headers. In compound headers, the message header is called the header path or the “root”
header. Interface messages are constructed in a hierarchy in
which some of the messages are “root” messages while other
messages are only defined for a specific message header.
It is always legal to fully specify any message header using
the (:) and the compound header (header path + sub-header),
or “root” header only, if no sub-header is defined for the
message in question. However, since the parser will recognize
only a “root” header after a program message terminator
( or ), the (:) is not required for the first “root”
header.
Some main rules are:
11 – 4
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User Manual
Brüel & Kjær
Chapter 11 – Appendix 2: Interface
Formats for Interface Messages
●
Interface messages may be joined together using the Program Message Unit Separator (;).
●
After a Program Message Terminator () the parser
recognizes only “root” headers (this is also the case after
Power Up).
●
After reception of a compound header including a header
path and a sub-header, the parser assumes the same
header path until it recognizes either a (:) or a . This
allows several sub-headers to be joined together with a
(;) using only header path in the first message.
Example:
PArameter:LEq?;LMAx?;LMIn?
In this example the PArameter command is the “root” header which can be preceded with the optional (:). The LEq?
command following the (:) is a sub-header which can be succeeded by other sub-headers using the (;) as separator. The
“root” header is active until another (:) is used or the
command appears:
PArameter:LEq?;LMAx?:Frequency_Weighting_1?:Fre
quency_Weighting_2?
The (;) following the LEq? query is used to join the two
interface messages, and the (:) following the LMAx? query is
required to change the “root” header.
Example:
:SEtup:N1 10;:SEtup:N2 50;:Setup:N3 90
When interface messages are joined together using (;), the
“root” header may be omitted for a sequence of interface subheaders belonging to the same “root” header as shown in the
following example:
:SEtup:N1 10;N2 50;N3 90
BB1119 – 11
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User Manual
11 – 5
Chapter 11 – Appendix 2: Interface
Formats for Interface Messages
Messages from the Mediator
The structure of the response messages returned by the Mediator unit depends on the nature of the query from the
controller. The messages are in minimum code (mnemonics)
or written in full – see section 11.2.4.
11.2.2 Use of Syntax Diagrams
In this manual, syntax diagrams are used to explain the
individual messages. Syntax diagrams use three types of symbol, as illustrated in Fig. 11.1.
;
,
Data Field
:
ABCD_EFGH
:
IJKL_MNOP
SP
–
Te
Data can be bypassed
941582e
Fig.11.1 General message syntax
Rectangular symbols indicate that the enclosed data must be
replaced by a data item defined elsewhere or chosen by the
user. The name of the data item is quoted in the upper lefthand corner of the symbol. The type of the data item, and
its allowed length in parentheses are, where appropriate,
given in the lower right-hand corner. Circular symbols enclose
single character literal data that must be included in the
message. Elongated, round-ended symbols indicate literal
word data, such as message headers.
Data items that may be by-passed are indicated by lines to
and from the main flow line. Data items that may be repeated
are indicated by lines that loop vertically from the main flow
line back over the data item and back to the main flow line.
If an item of data is repeated, then the number of repetitions
11 – 6
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Chapter 11 – Appendix 2: Interface
Formats for Interface Messages
is indicated by a number above the flowline. Flow is from left
to right unless arrows indicate otherwise.
11.2.3 General Rules for Constructing an Interface
Message
The Mediator allows you to input the message headers and
any character type data fields in full. For ease of use, the
data field names correspond to those on the Mediator’s menu
and screen texts wherever possible.
In order to reduce coding and transmission time, mnemonics
can be entered for each of the message components which
use character type data. The mnemonics are derived from the
names of the individual headers or data fields, and their
syntax is the same for headers and character type data fields.
In this manual a message’s minimum allowable mnemonic is
given
in
bold
upper
case
text,
for
example
Frequency_Weighting_1:F100. In addition, the following
rules apply:
1.
All entries can always be written out in full. For example:
Frequency_Weighting_1:F100
2.
Both upper and lower case letters are recognized and are
equivalent:
frequency_WEIGHting_1:f100
3.
All headers and character type data fields can be truncated to the mnemonic.
Frequency_Weighting_1:F100
Freq_Wgt_1:F100
F_W_1:F100
4.
BB1119 – 11
All mnemonics are unique and consist of one or more
words, with each word consisting of one to three characters, plus the word concatenators (_).
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Chapter 11 – Appendix 2: Interface
Formats for Interface Messages
5.
When the amplifier receives character type messages, it
checks the entire message. Therefore, any mis-spelled
words are detected as unknown commands.
6.
The amplifier returns the full message or only the mnemonics when transmitting data containing headers and
character type data fields over the bus. This is determined by the setting of the parameter Header (see section
11.5.2).
7.
Between the header and the first data field, a header
separator is entered. The header separator is a space
(SP).
8.
Between each of the data fields, the data separator (a
comma <,>) must be entered. See section 11.2.2.
11.2.4 Mnemonic Codes
The following general rules clarify the construction of the
mnemonics (minimum codes). The rules apply for all headers
and data fields which use character type data.
1.
If the first letter of every word produces a unique code,
then this is the mnemonic. For example, the header
Frequency_Weighting_1
2.
becomes F_W_1
If the first letter of every word does not give a unique
mnemonic, then include two or more characters of one or
more words until the mnemonic is unique. For example,
the message
SETUP_SEQUENCE ON becomes SE_SE ON
SETUP_SEQUENCE OFF becomes SE_SE OF
Notes:
●
11 – 8
Word concatenators are always required in mnemonics
which include more than one word, except immediately
before the question mark (?) in an input message header.
Here, the inclusion of the word concatenator is optional.
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Chapter 11 – Appendix 2: Interface
Types of Data
●
In the tables and syntax diagrams throughout this interface manual, the mnemonics are the characters appearing
in bold within the headers and character type data fields.
●
Headers are output either in full or in mnemonic form
by the amplifier.
11.2.5 Message Terminator
The only legal Program Message Terminator character is the
NL (line feed – decimal 10). The is considered to be a LF.
11.3 Types of Data
A message can contain one or more data fields, or none. The
type of allowed data varies for each message, but the available
types are:
●
character data
●
numeric data (decimal and integer)
●
string data
The data separator used between all data fields is a comma
(,). Fig. Fig. 11.2 shows the general syntax of a message containing all legal data types.
;
,
Character
Data
Only for instrument output
Header
SP
–
Fig.11.2
BB1119 – 11
Numeric
(Decimal)
Data
String
Data
Te
General format for a message with all legal data types
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Chapter 11 – Appendix 2: Interface
Character Data
11.4 Character Data
Character data must begin with an alphabetic character, either upper or lower case. This initial alphabetic character
can be followed by any printable ASCII character (from 32
through 127 (decimal)), with the exception of a space (SP), a
comma (,), a semi-colon (;), a colon (:), or the delete character
(DEL). Fig.11.3 shows the valid form of entry for character
data.
Alpha
Alpha Prnt.
ASCII Char.
Except
SP
– , ; DEL
931103e
Fig.11.3 General syntax for character data fields
All headers and set-up parameter names are character data,
as are many of the parameter settings. In the syntax diagrams, character data is represented by “Char.”. When character data must be included, the data is written out in full
in the syntax diagrams with the mnemonic codes marked as
bold upper-case characters.
11.4.1 Numeric Data
Numeric data that is entered through the interface closely
follows the format defined in the ANSI/IEEE 488.2 (1987)
Standard, “IEEE Standard Codes, Formats, Protocols and
Common Commands” and the ISO 6093–1985 Standard,
“Representation of numerical values in character strings for
information interchange”.
The types of numeric data are represented in the syntax
diagrams by NR1, NR2 and NR3, conforming to the above
mentioned standards. The data is checked for illegal numbers
not conforming to the above standards. The syntax for NR1
data (implicit point representation) is shown in Fig.11.4 .
11 – 10
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Chapter 11 – Appendix 2: Interface
Character Data
NR2 data (floating point number with an explicit decimal
point) is not represented below as it is included in NR3.
Mediator usually accepts the full NR3 (explicit point scaled
representation, see Fig. 11.5 ), except where syntax diagrams
state that NR1 or NR2 is required.
+
Digit
–
931104e
Fig.11.4 Syntax for numerical data of type NR1
.
+
Digit
Digit
Digit
.
–
Digit
.
+
E-Digit
E
–
NR1 (1-3)
Suffix
(input only)
931106e
Fig.11.5 Syntax for numerical data of type NR3
A digit is any of the 10 number symbols, 0 through 9.
In this manual both commands and queries are illustrated
using syntax diagrams, and are usually accompanied by examples. When a syntax diagram illustrates the input of numeric data, an explanation is given as to how the Mediator
accepts the numeric data. A legal range is always given (unless only specific values are allowed, and these are shown),
BB1119 – 11
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Chapter 11 – Appendix 2: Interface
Character Data
and the value received by the amplifier is rounded so that it
lies within the allowable range.
If many values are legal, the explanation given will indicate
whether Mediator chooses the nearest value above (Round
Up) the nearest value below (Round Down) or just the nearest
value (Round Nearest). The value is always rounded to the
given resolution.
The default value for the parameter is also given. This is the
factory setting for that parameter.
11.4.2 String Data
String data is the format used to enter text in a message. In
addition, it is used to enter special characters not allowed in
character data fields.
String data is always enclosed in quotation marks. To include
one quotation mark in the string data field, two quotation
marks need to be entered. Fig. 11.6 gives the syntax for entering string data. The length in characters of a fixed length
string data is given in parentheses after the data type name.
"
"
(to be
inserted)
"
"
Any ASCII
character
except"
931107e
Fig.11.6
Syntax for entering string data
Example:
"This is the text."
"This text contains "" one quotation mark."
11 – 12
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Chapter 11 – Appendix 2: Interface
Information Protocol
11.5 Information Protocol
11.5.1 Introduction
Each command or query described in this manual has a name,
or Header. The header can be thought of as a variable name,
and the value or option it is assigned is the parameter value
which the Mediator actually uses to carry out the specified
operation. See Fig. 11.7.
Par. Header
Char
SP
–
Parameter
Value(s)
Te
941101e
Fig.11.7 The header designates the parameter name for the value (or
option) which follows
11.5.2 Header
OFF
To Mediator
:
HEADER
SP
–
SHORT
Te
LONG
970184e
Fig. 11.8 Syntax for Header command
The Header command allows you to specify how the response
messages are to be sent from the Mediator:
OFf
BB1119 – 11
If you specify OFf, no header will be returned to you by the amplifier as a query
response.
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Chapter 11 – Appendix 2: Interface
Information Protocol
Short
If you specify Short as the header, character data from the amplifier will be sent as
mnemonics. That is, the letters shown in
bold only for each command.
Long
If you specify a Long header, the Mediator
will return the entire name for each command header and character data.
Example of a response with a Long header to the query:
Bandwidth?
:BANDWIDTH OCTAVE_3
Example of the response with a Short header to query:
Bandwidth?
:B O_3
Example of the response with an OFf header to the query:
Bandwidth?
O_3
You can query Mediator regarding the header setting as
shown in Fig. 11.9.
The default setting is Long
To Mediator
:
HEADER?
Te
HEADER
SP
–
From Mediator
Header
:
Te
Char
Header OFf
970185e
Fig.11.9 Syntax for Header? query and Mediator response
11 – 14
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Chapter 11 – Appendix 2: Interface
Setting up the PC
Example Response:
:Header Long
:H S
OF
11.6 Setting up the PC
Warning! When connecting Mediator to a PC, ensure that
both the computer and the Mediator are switched off. Otherwise the instruments could be damaged.
1.
Connect the computer to Mediator via the SerialInterface socket on the base of the Mediator using 9-pole
Cable with 25-pole Adaptor AO 1386. If the computer has
a 9-pole interface socket, remove the adaptor.
2.
Start a communications program (e.g. BK–Link or ProComm) on the computer.
Refer to section 7.2 for Brüel & Kjær software such as
Noise Explorer 7815, Protector 7825 and Evaluator
7820/7821, which are written specifically for communicating with your sound level meter, working with and
displaying sound level meter data.
3.
Configure the computer as follows (depending on the communications program):
9600 Baud
8 data bits
1 stop bit
Parity: none
Handshake: Hardwired
BB1119 – 11
4.
Switch on Mediator via the interface.
5.
Set the Mediator’s Baud Rate to 9600 and Handshake
to Hardwired (see section 3.1.5). for the remote interface.
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Chapter 11 – Appendix 2: Interface
Setting up the PC
6.
Press 〈Enter〉 on the computer.
Communication is established and the prompt (> ) is
shown on the computer screen. The Mediator can now be
controlled from the computer.
Note: The baud rates and handshake of the Mediator and
the computer must be the same to enable them to communicate without losing or corrupting data. A higher baud rate
may be possible depending on your system.
11.6.1 Commands
The command and query messages available are listed in
Table 11.1. The commands and queries are explained in the
following sections, in alphabetical order.
Message
Command
Query
Bandwidth
•
•
Continue
•
Message
Command
•
PArameter
PAUse
•
Error
•
RAnge
•
File
•
REset
•
•
Frequency_
Weighting_1
•
•
SEtup
Frequency_
Weighting_2
•
•
STatus
Header
•
•
SYstem
•
Version
IDentify
Key
Query
•
•
•
•
•
•
•
Table 11.1 Command and query message overview
11 – 16
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Chapter 11 – Appendix 2: Interface
Setting up the PC
11.6.2 Bandwidth
The Bandwidth command is used for setting the bandwidth
for Detector 1. The syntax is shown in Fig. 11.10.
OCTAVE_1
To Mediator
:
BANDWIDTH
SP
–
Te
OCTAVE_3
BROAD
980293e
Fig.11.10 Syntax for Bandwidth command
The default setting is: Broad band
Note: The 1/3- and 1/1-octave options are only available when
the 1/1-octave and 1/3-octave Filter Set is installed in the
Mediator.
To Mediator
:
BANDWIDTH?
Te
BANDWIDTH?
SP
–
From Mediator
Bandwidth
:
Te
Char
980147e
Fig. 11.11 Syntax for the Bandwidth? query and Mediator response
The syntax for the query Bandwidth? and the response returned by the Mediator appears in Fig. 11.11.
Example (setting the bandwidth to 1/3 octave):
Interface job from controller:
Bandwidth Octave_3
BB1119 – 11
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User Manual
11 – 17
Chapter 11 – Appendix 2: Interface
Setting up the PC
Query from controller:
Bandwidth?
From Mediator:
:Bandwidth Octave_3
11.6.3 Continue
The Continue command starts a measurement without resetting the mediator. The syntax is shown in Fig. 11.12.
To Mediator
:
CONTINUE
Te
980157e
Fig.11.12 Syntax for Continue command
11.6.4 Error?
To Mediator
:
Te
ERROR?
From Mediator
:
ERROR?
Error No
SP
–
,
Nr.1
Log Buffer
Err Msg
,
String (25)
Te
String (100)
Header OFf
970204e
Fig.11.13 Syntax for Error? query and amplifier response
The Error? query returns information from the Mediator
about the error condition of the device, where “Error No” is
the number of the error, “Err Msg” is a string containing a
short description of the error, and “Log Buffer” contains a
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Chapter 11 – Appendix 2: Interface
Setting up the PC
string with the interface message which was executing when
the error occurred. If the error was a device error, the log
buffer will be empty.
After the response to the ERror? query is sent, the error
buffer is reset and Error No is set to 0. See section 10.4 for
a detailed listing of all interface and device errors.
Example:
Query from controller:
Error?
From Mediator:
:Error 16,"UNEXPECTED END DETECTED
","^10^END
11.6.5 File
The File queries are used for performing operations on the
files in the Mediator memory.
Files are numbered from 0 to 512 for each software package.
File number 0 is only used for back-up purposes, so that the
total number of files is 511. File names normally consist of
three characters with a three character extension, however,
the file name may contain up to 8 characters.
Copy? query
Copy? is used for getting one or more files from the Mediator
File Manager. You can specify a block of files by using the
“*” and “?” wild card characters. The syntax for the Copy?
query is shown in Fig. 11.14.
The first figure in the block size descriptor specifies how many
figures follow, these figures specify the size of the binary data
block.
Example (copying file 21 from the Basic software package):
Interface job from controller:
BB1119 – 11
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User Manual
11 – 19
Chapter 11 – Appendix 2: Interface
Setting up the PC
To Mediator
File Name
:
:
FILE
SP
–
COPY?
Te
String (12)
From Mediator
,
File Name
:
:
FILE
File Check
Sum
(0...65535)
Nr 1
COPY?
SP
–
,
String (12)
Block File
Data
(Block Size
Descriptor)
Binary Data
,
Te
980303e
Fig.11.14 Syntax for the File:Copy command
File:Copy? "021.M26"
From Mediator:
:FILE:COPY "021.M26",#3409 (binary data)
Delete? query
DElete? is used for deleting one or more files from the Mediator File Manager. You can specify a block of files by using
the “*” and “?” wild card characters. The syntax for the DElete? query is shown in Fig. 11.15.
The response to a DElete? query is a File_Ok or File_Failed
message from the Mediator.
Example (deleting all files from the Basic software module):
Interface job from controller:
File:DElete? "*.M26"
From Mediator:
11 – 20
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User Manual
Brüel & Kjær
Chapter 11 – Appendix 2: Interface
Setting up the PC
To Mediator
File Name
:
:
FILE
Te
SP
–
DELETE?
String (12)
From Mediator
:
:
FILE
SP
–
DELETE?
FILE_OK
or
FILE_FAIL
Te
980302e
Fig.11.15 Syntax for the File:DElete command
:FILE:DELETE FILE_OK
Directory? Query
The File_DIrectory? query shows the entire contents of the
Mediator File Manager or you can specify the file names
you want to see. The directory string shows the number of
files, the file names and the associated file information, i.e.,
day, month, year, hour, minute and second. The syntax for
the File_DIrectory? query and response returned by the Mediator appear in Fig. 11.16.
To Mediator
File Name
:
:
FILE
DIRECTORY?
SP
–
DIRECTORY?
SP
–
Te
String (12)
From Mediator
:
FILE
,
:
File Name
String (12)
,
File Info
String
Number of
Files
Nr 1
,
File Size
Te
String
980211e
Fig.11.16 Syntax for the File_DIrectory? query and Mediator response
BB1119 – 11
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User Manual
11 – 21
Chapter 11 – Appendix 2: Interface
Setting up the PC
Example (show all files with extension M26):
Interface job from controller:
File:DIrectory? "*.M26"
From Mediator:
:FILE:DIRECTORY 7,"MEASPAR.M26","1998-07-23
09:57:30","468","SETUP_0.M26","1998-07-23
09:30:58","115","SETUP_1.M26","1998-07-23
09:30:58","115","SETUP_2.M26","1998-07-23
09:30:58","115","SETUP_3.M26","1998-07-23
09:30:58","115","SETUP_4.M26","1998-07-23
09:30:58","115","001.M26","1998-07-23 10:13:46","409"
Space? Query
The File_Space? query shows how much memory space remains in the Mediator memory. The syntax for the
File_Space? query and response returned by the Mediator
appear in Fig. 11.17.
To Mediator
:
:
FILE
SPACE?
Te
From Mediator
:
FILE
:
SPACE?
SP
–
Disk space
in Bytes
String
Te
980301e
Fig.11.17 Syntax for the File_Space? query and Mediator response
Example (space query):
Interface job from controller:
File:Space?
From Mediator:
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Chapter 11 – Appendix 2: Interface
Setting up the PC
:FILE:SPACE? "2011648"
Save? query
SAve? is used for storing the current measurement file (refer
to section 6.1.1 for information about saved data). The file is
saved with a file number and an extension that identifies the
current software module, for example, 005.M26. The syntax
for the SAve? query is shown in Fig. 11.18.
To Mediator
:
:
FILE
Te
SAVE?
From Mediator
:
FILE
:
SAVE?
SP
–
FILE_OK
or
FILE_FAIL
Te
980380e
Fig.11.18 Syntax for the File:SAve command
The response to a SAve? query is a File_Ok or File_Failed
message from Mediator. The File_Failed message will normally only occur if there is not sufficient memory space.
Example (saving the current measurement file):
Interface job from controller:
File:SAve?
From Mediator:
:FILE:SAVE FILE_OK
11.6.6 Frequency_Weighting_1
The Frequency_Weighting_1 command is used for setting up
the frequency weighting options for Detector 1. The syntax is
shown in Fig. 11.19.
BB1119 – 11
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User Manual
11 – 23
Chapter 11 – Appendix 2: Interface
Setting up the PC
To Mediator
:
FREQUENCY_WEIGHTING_1
Parameter
SP
–
Te
Char/Nr.
980163e
Fig.11.19 Syntax for Frequency_Weighting_1 command
The default setting is: A-weighting
The frequency weighting values are: A, C, Lin, F20, F25,
F31_5, F40, F50, F63, F80, F100, F125, F160, F200, F250,
F315, F400, F500, F630, F800, F1K, F1K25, F1K6, F2K,
F2K5, F3K15, F4K, F5K, F6K3, F8K, F10K, F12K5.
Note 1: The “K” is used as decimal separator.
Note 2: Some combinations of weightings are mutually exclusive for the two detectors.
The syntax for the query Frequency_Weighting_1? and the
response returned by the Mediator appears in Fig. 11.20.
To Mediator
:
Te
FREQUENCY_WEIGHTING_1?
From Mediator
Wgt. Value
:
FREQUENCY_WEIGHTING_1?
SP
–
Te
Char
980149e
Fig.11.20 Syntax for the Frequency_Weighting_1? query and Mediator response
Example (setting frequency weighting for Detector 1 to Cweighting):
Interface job from controller:
11 – 24
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User Manual
Brüel & Kjær
Chapter 11 – Appendix 2: Interface
Setting up the PC
Frequency_Weighting_1 C
Query from controller:
Frequency_Weighting_1?
From Mediator:
:FREQUENCY_WEIGHTING_1 C
11.6.7 Frequency_Weighting_2
The Frequency_Weighting_2 command is used for setting up
the frequency weighting options for Detector 2. The syntax is
shown in Fig. 11.21.
From Mediator
:
PEAK_C
FREQUENCY_WEIGHTING_2?
:
Te
PEAK_L
980345e
Fig.11.21 Syntax for Freq_Wgt_2 command
The default setting is: Peak and C-weighting
Peak weighting can be C or L.
The syntax for the query Frequency_Weighting_2? and the
response returned by the Mediator appears in Fig. 11.22.
Example (setting frequency weighting for Detector 2 to Peak
and L-weighting):
Interface job from controller:
Frequency_Weighting_2 Peak_L
Query from controller:
Frequency_Weighting_2?
From Mediator:
BB1119 – 11
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User Manual
11 – 25
Chapter 11 – Appendix 2: Interface
Setting up the PC
To Mediator
:
Te
FREQUENCY_WEIGHTING_2?
From Mediator
Wgt. Value
:
FREQUENCY_WEIGHTING_2?
SP
–
Te
Char
980150e
Fig.11.22 Syntax for the Frequency_Weighting_2? query and Mediator response
:FREQUENCY_WEIGHTING_2 PEAK_L
11.6.8 Header
Refer to section 11.5.2.
11.6.9 Identify?
The Identify? query returns the device ID, which for the
Mediator is “B&K 2238”. This is a standard Brüel & Kjær
method of determining which device is currently connected
via the interface. The syntax for the Identify? query is shown
in Fig. 11.23.
To Mediator
:
Te
IDENTIFY?
From Mediator
Device ID
:
IDENTIFY
SP
–
Te
String (8)
Header OFf
970199e
Fig.11.23 Syntax for the Identify? query and Mediator response
11 – 26
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Chapter 11 – Appendix 2: Interface
Setting up the PC
Example:
Query from controller:
Identify?
From Mediator:
:IDENTIFY "BK2238"
11.6.10 Key
The Key command allows you to use the pushkey functions
via the interface. See section 2.3 for a description of pushkey
functionality. The 16 keys on the front panel are numbered
according to Fig. 11.24.
1
2
3
6
4
7
9
10
8
12
5
13
11
0
14
15
16
980205e
Fig.11.24 Numbering of keys on the front panel
BB1119 – 11
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User Manual
11 – 27
Chapter 11 – Appendix 2: Interface
Setting up the PC
You may use the key numbers shown in Fig. 11.24 or the key
names used in the syntax diagram in Fig. 11.25.
ONOFF
CALIBRATE
SYSTEM
DATA
RANGE
SETUP
UP
To Mediator
:
KEY
SP
–
DOWN
Te
LEFT
RIGHT
RESET_START
PAUSE_CONTINUE
MEASURE
SOFT_LEFT
SOFT_RIGHT
LIGHT
Value
(Key 1 to16)
Nr. 1
980159e
Fig.11.25 Syntax for the Key command
Note: An interface error may occur if a key command sequence is used for recalling one of the four user defined setups or the factory set-up or if you try to change the interface
parameters in the Remote Interface Window. This is because these commands reset the interface to set up the new
interface parameters.
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Chapter 11 – Appendix 2: Interface
Setting up the PC
Example (key sequence for stepping the measurement range
10 dB up):
Interface job from controller:
Key
Key
Key
Key
5
10
14
14
Alternatively:
Key RAnge
Key RAnge
Key Soft_Left
Note: When you use a “manual” key sequence command you
must normally ensure that the cursor is in a known position,
for example by sending the Key MEasure and Key
Soft_Right commands immediate before the key sequence.
11.6.11 PArameter?
The PArameter? query is used for checking the selected measurement parameters. The syntax for the query PArameter?
and the response returned by the Mediator appears in
Fig. 11.26.
To Mediator
:
PARAMETER
:
Sub Header?
Frequency
Weighting
Parameter
SP
–
See table
See table
Time
Weighting
Parameter
Te
See table
From Mediator
Parameter
:
PARAMETER
SP
–
Te
Char
See text
980346e
Fig.11.26 Syntax for the PArameter? query and Mediator response
BB1119 – 11
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User Manual
11 – 29
Chapter 11 – Appendix 2: Interface
Setting up the PC
Frequency
Weighting
Setting
Time
Weighting
Setting
Aux_1
—
—
Aux_2
—
—
Dose
—
—
Dose_Lav
—
Fast
Slow
EAd
—
—
ED
—
—
ELapsed
—
—
Inst
A
C
Lin
Octave
Fast
Slow
Impulse
LAv
A
C
Lin
Octave
Fast
Slow
LEq
A
C
Lin
Octave
—
LEPd
—
—
LIeq
A
C
Lin
Octave
—
Sub Header
Table 11.2 Sub-header and parameter settings for
the PArameter? query
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Chapter 11 – Appendix 2: Interface
Setting up the PC
Frequency
Weighting
Setting
Time
Weighting
Setting
LMAx
A
C
Lin
Octave
Fast
Slow
Impulse
LMIn
A
C
Lin
Octave
Fast
Slow
Impulse
LP
A
C
Lin
Octave
Fast
Slow
Impulse
LPK
—
—
LPKMax
—
—
No_Peaks
—
—
Overload
—
—
Underrange
—
—
Sub Header
Table 11.2 Cont.Sub-header and parameter settings for
the PArameter? query
BB1119 – 11
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Chapter 11 – Appendix 2: Interface
Setting up the PC
Example (reading the measured LAeq value):
Query from controller:
PArameter:LEq? A
From Mediator (value in dB):
:PARAMETER_LEQ 46.9
11.6.12 PAUse
The PAUse command message puts the Mediator in Pause
mode. The pause will take effect on the next even second of
the Mediator’s clock. Therefore, you must wait for one full
second before sending the next command to be sure that the
pause condition is in effect.
To Mediator
:
PAUSE
Te
980156e
Fig.11.27 Syntax for the PAUse command
11.6.13 RAnge
The RAnge command message is used for setting the measurement range.
To Mediator
:
RANGE?
SP
Value
(80-140)
Te
Nr 1
980308e
Fig.11.28 Syntax for the RAnge command
11 – 32
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Chapter 11 – Appendix 2: Interface
Setting up the PC
The default range setting is: 30 – 110 dB
You must enter the Value field as the upper value in the
desired measurement range. Table 11.3 lists the default field
settings.
Field Name
Field Setting
Comments
Value (command)
80
90
100
110
120
130
140
0 – 80
10 – 90
20 – 100
30 – 110
40 – 120
50 – 130
60 – 140
Status (query response)
0 – 80
10 – 90
20 – 100
30 – 110
40 – 120
50 – 130
60 – 140
These are the default ranges.
However, if a non-standard
transducer is used the ranges
may be different.
Table 11.3 RAnge data fields and codes
The RAnge? query message shows the current measurement
range. The syntax for the query and the response returned
by the Mediator appears in Fig. 11.29.
To Mediator
:
RANGE?
Te
From Mediator
:
RANGE?
SP
–
Value
(80 - 140)
Nr 1
Te
980152e
Fig.11.29 Syntax for the RAnge? query message and Mediator response
BB1119 – 11
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Chapter 11 – Appendix 2: Interface
Setting up the PC
Example (setting the measurement range to 50 – 130 dB):
Interface job from controller:
RAnge 130
Query from controller:
RAnge?
From Mediator:
:RANGE 130
11.6.14 REset
The REset command message resets the Mediator. The measurement is restarted, i.e., the current measurement data is deleted and the buffer and the Elapsed Time parameter are set
key.
to zero. This command is equivalent to pressing the
0
To Mediator
:
RESET
Te
980155e
Fig.11.30 Syntax for the REset command
Note: There is no reset warning.
11.6.15 SEtup
The SEtup commands are used for setting up most of the
measurement parameters in the Measurement Setting menu.
A separate sub-header is used for the Auto Start commands,
to distinguish the four possible Auto Start sequences.
Auto Start Command
The syntax for the Auto_Start_X command is shown in
Fig. 11.31.
11 – 34
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Chapter 11 – Appendix 2: Interface
Setting up the PC
To Mediator
:
SETUP
:
Sub Header 1
:
Sub Header 2
See table
SP
–
Parameter
See table
Te
See table
980305e
Fig.11.31 Syntax for the SEtup:Auto_Start_X command
Sub Header 1
Auto_Start_1
Auto_Start_2
Auto_Start_3
Auto_Start_4
Sub Header 2
Parameter Setting
Application
Current_Bz
None
Char.
Setup_No
1 ... 4
NR1
Time
(Year) –3000 ... 3000
(Month) 1 ... 12
(Day) 1 ... 31
(Hour) 0 ... 23
(Minute) 0 ... 59
(Second) 0 ... 59
NR1
Table 11.4 Auto_Start_X sub-header and parameter settings
Example (setting the owner for Auto Start number 3 to the
current application module):
Interface job from controller:
SEtup:Auto_Start_3:Application Current_Bz
Query from controller:
SEtup:Auto_Start_3?
From Mediator:
:SETUP:AUTO_START_3
1998,7,23,11,13,27,"BZ7126",1
BB1119 – 11
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Chapter 11 – Appendix 2: Interface
Setting up the PC
Other SEtup Commands
The remaining SEtup commands use the syntax illustrated
in Fig. 11.32.
Parameter
:
:
SETUP
Sub Header
Te
SP
—
See table
See table
980215e
Fig.11.32 Syntax for the SEtup command
Sub Header
Parameter Setting
Comments
Aux_1_FW
LINear_Frequency_
Weighting
Detector_1_Frequen
cy_Weighting
Char
Sets Linear Frequency
weighting or Detector 1 output to the Aux 1 output
Criterion_Level
70 ... 100
NR3
Sets Criterion level between
70 and 100 dB
Exchange_Rate
4, 5
NR1
Sets Exchange Rate to 4 or
5 dB
Exposure_Time
(Hour) 0 ... 23
(Minute) 0 ... 59
NR1
Sets Exposure Time in
hours and minutes
Peaks_Over
0 ... 180
NR3
Sets the peak counting level
PREset_Time
(Hour) 0 ... 9999
(Minute) 0 ... 59
(Second) 0 ... 59
NR1
Sets the measurement time
for each measurement in an
Auto Start sequence
Random_Frontal
Random
Frontal
Char
Sets Random or Frontal frequency correction
Recall
0 ... 4
NR1
Recall measurement set-up
0 to 4 (0 is default set-up)
Table 11.5 Sub-header and parameter settings for the SEtup command
11 – 36
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Chapter 11 – Appendix 2: Interface
Setting up the PC
Sub Header
Parameter Setting
Comments
SAve
1 ... 4
NR1
Saves measurement set-up
in memory 1 to 4
SEquence
OFf, ON
Char
Switches the Auto Start
sequence On or Off
Threshold_Level
0 ... 100
NR3
Sets the Threshold level in
dB for Occupational Health
Wind_Screen
OFf, ON
Char
Switches the windscreen
frequency correction On or
Off
Table 11.5 Sub-header and parameter settings for the SEtup command
The syntax for the query SEtup? and the response returned
by Mediator appears in Fig. 11.33.
BB1119 – 11
2238 Mediator
User Manual
11 – 37
Chapter 11 – Appendix 2: Interface
Setting up the PC
Sub Header
Auto_Start_1?
Auto_Start_2?
Auto_Start_3?
Auto_Start_4?
Aux_1?
Aux_1_FW?
Aux_2?
Criterion_Level?
Exchange_Rate?
Exposure_Time?
Peaks_Over?
Preset_Time?
Random_Frontal?
SEquence?
Threshold_Level?
Wind_Screen?
Table 11.6 SEtup queries
Example (checking the Preset Time set to 10 minutes):
Query from controller:
SEtup:Preset_Time?
From Mediator:
:SETUP:PRESET_TIME 0,10,0
11 – 38
2238 Mediator
User Manual
Brüel & Kjær
Chapter 11 – Appendix 2: Interface
Setting up the PC
To Mediator
:
:
SETUP
Te
Sub Header?
See table
From Mediator
Parameter
SETUP
:
:
Sub Header?
Te
SP
–
See table
See table
980216e
Fig.11.33 Syntax for the SEtup? query and Mediator response
11.6.16 STatus?
The STatus? query is used to check whether the Mediator is
in pause mode or is measuring. The syntax is shown in
Fig. 11.34.
To Mediator
:
STATUS?
Te
From Mediator
:
SP
–
STATUS?
Status
(Measuring/
Paused)
Char
Te
980153e
Fig.11.34 Syntax for the STatus? query and Mediator response
The status can be: Measuring or Paused
Example:
Query from controller:
STatus?
BB1119 – 11
2238 Mediator
User Manual
11 – 39
Chapter 11 – Appendix 2: Interface
Setting up the PC
From Mediator:
:STATUS PAUSED
11.6.17 SYstem
The SYstem command is used for setting the date and time
on the Mediator’s calendar and clock. The syntax is shown
in Fig. 11.35.
:
SYSTEM
:
SP
TIME
Date (YY,MM,DD)
Time (HH,MM,SS)
Te
Nr 1
980217e
Fig.11.35 Syntax for SYstem commands
Sub Header
Date and Time Setting
(Year) –3000 ... 3000
(Month) 1 ... 12
(Day) 1 ... 31
(Hour) 0 ... 23
(Minute) 0 ... 59
(Second) 0 ... 59
Time
NR1
Comments
Comma separated in the
form of:
YY,MM,DD,HH,MM,SS
Table 11.7 Parameter settings for the SYstem:Time command
The syntax for the query SYstem? and the response returned
by the Mediator appears in Fig. 11.36.
Example (setting the time to 1. January 1999, 10:15:00):
Interface job from controller:
SYstem:Time 1999,01,01,10,15,00
Query from controller:
SYstem:Time?
11 – 40
2238 Mediator
User Manual
Brüel & Kjær
Chapter 11 – Appendix 2: Interface
Setting up the PC
To Mediator
:
TIME?
:
SYSTEM
Te
From Mediator
:
:
SYSTEM
SP
TIME?
Parameter
Value
Te
Nr 1
980219e
Fig.11.36 Syntax for the SYstem? queries and Mediator response
From Mediator:
:SYSTEM:TIME 1999,01,01,10,15,00
11.6.18 Version
The Version? query message shows the running software version of the Mediator. The Syntax is shown i Fig. 11.37.
To Mediator
:
VERSION?
Te
From Mediator
:
VERSION?
SP
–
Module
(BZ....)
String
,
Version No.
Nr 1
,
Revision No.
Nr 1
,
History No.
Te
Nr 1
980304e
Fig.11.37 Syntax for the Version? query message and Mediator response
BB1119 – 11
2238 Mediator
User Manual
11 – 41
Chapter 11 – Appendix 2: Interface
Setting up the PC
Field Name
Version status
Field Setting
BZ 7126
BZ 7125
BZ 7123
BZ 7124
Comments
Basic SLM Software
Enhanced SLM Software
Frequency Analysis Software
Logging SLM Software
Table 11.8 Version data fields and codes
Example (checking the current version):
Query from controller:
Version?
From Mediator:
:VERSION "BZ7126",1,0,0
11 – 42
2238 Mediator
User Manual
Brüel & Kjær
Chapter 12
Index
Numerics
1/1-octave and 1/3-octave filter set ............... 1 – 5
9-pole cable .............................. 1 – 4, 7 – 5, 11 – 15
A
About System Window .................................. 3 – 8
AC Output ..................................................... 7 – 6
Accessories (effect of) .................................... 9 – 5
Application
module ............................................ 1 – 7, 3 – 4
programs ................................ 1 – 5, 2 – 8, 7 – 5
status ..................................................... 4 – 10
Window .................................................... 3 – 4
ASCII characters ....................................... 11 – 10
Auto Start .................................. 4– 9, 5– 10, 6 – 2
application status .................................. 4 – 10
sequence ................................................ 4 – 10
Window .................................................... 4 – 9
Auto_Start_1...4 command ....................... 11 – 35
Auto_Start_1..4? query ............................. 11 – 38
Aux 1 ............................................ 1 – 5, 4 – 8, 9 – 4
Aux 2 ............................................ 1 – 5, 4 – 8, 9 – 4
Aux_1? query ............................................. 11 – 38
Aux_1_FW command ................................ 11 – 36
Aux_1_FW? query ..................................... 11 – 38
Aux_2? query ............................................. 11 – 38
A-weighting ................................................... 1 – 5
B
Backlight .......................................... 1 – 14, 2 – 10
pushkey .................................................. 2 – 10
BB1119 – 11
Back-up battery ................................. 1 – 13, 2 –4
Bandwidth ................................................... 5 – 10
command ............................................. 11 – 17
Bar graph ................................ 2 –10, 4 – 4, 5 – 11
Basic
configuration ........................................... 1 –4
SLM software ................................. 1 –4, 1 –7
version (BZ 7126) .................................... 1 –3
Batteries ............................. 6 – 2, 8 – 3, 9 –4, 9 –5
checking level .......................................... 2 –2
fitting ....................................................... 2 –2
handling ................................................... 2 –3
operating time ......................................... 2 –3
recharging ................................................ 2 –3
saving ..................................................... 2 – 10
type .......................................................... 1 –4
Battery
back-up ......................................... 1 – 13, 2 –4
flat ............................................................ 2 –4
level ........................................................ 2 – 12
remaining time ........................................ 2 –3
symbol ...................................................... 2 –2
Baud rate ........................ 3 –5, 7 –3, 7– 4, 11 – 15
Broadband data ......................... 1 – 14, 6 –3, 6 –4
Buffer ..................................... 1 – 13, 6– 2, 11 – 34
C
Calendar data .............................................. 1 – 12
Calibrate pushkey ......................................... 2 –8
Calibration .................................................... 5 –2
data ........................................................ 1 – 12
2238 Mediator
User Manual
12 –43
Index
factor .......................................................1– 13
Free-field/Diffuse Field ...........................5 – 2
history ....................................................1– 12
menu ............................................1 – 10, 1– 12
principle of ...............................................5 – 2
set-up .............................................1 –13, 6 – 3
signal ........................................................5 – 2
time ...........................................................6 – 3
when to .....................................................5 – 2
Window .....................................................5 – 2
Calibrator
types .........................................................5 – 3
Cancel pushkey ............................................2– 10
Care of Mediator ............................................8 – 2
Centre frequency .........................................5– 10
Changing
applications ..............................................1 – 7
displayed parameter ..............................5– 11
language .................................................2– 12
Character data ................................11 – 9, 11– 10
Checking
battery level .............................................2 – 2
calibration ................................................5 – 7
Cleaning Mediator .........................................8 – 2
COM port .......................................................7 – 5
Command
Auto_Start_1...4 ...................................11– 35
Aux_1_FW ............................................11– 36
Bandwidth ............................................11– 17
Continue ...............................................11– 18
Criterion_Level ....................................11– 36
Exchange_Rate ....................................11– 36
Exposure_Time ....................................11– 36
File ........................................................11– 19
Frequency_Weighting_1 ......................11– 23
Frequency_Weighting_2 ......................11– 25
Key ........................................................11– 27
PAUse ...................................................11– 32
Peaks_Over ..........................................11– 36
Preset_Time .........................................11– 36
Random_Frontal ..................................11– 36
RAnge ...................................................11– 32
Recall ....................................................11– 36
REset ....................................................11– 34
SAve .....................................................11– 37
SEquence ..............................................11– 37
SEtup ....................................................11– 34
SYstem .................................................11– 40
Threshold_Level ..................................11– 37
Wind_Screen ........................................11– 37
Command message overview ....................11– 16
Communication
error ..........................................................7 – 5
program ................................................11– 15
Compound message .....................................11 – 4
Computer (setting up) ...............................11– 15
Concatenator ................................................11 – 8
Condenser microphone ................1 – 4, 5 – 3, 9 – 2
12 –44
Connecting a microphone extension cable ...2 –7
Connectors .....................................................1 –5
Constructing interface message .................11 –7
Continue command ....................................11 – 18
Contrast .........................................................3 –7
Controlling Mediator via the interface .......11 –3
Conventions in this Manual ..........................1 –3
Correction filters .........................1 – 5, 4 – 7, 5 –2
Creterion_Level command ........................11 – 36
Criterion level ..............................................4 – 12
Criterion_Level? query ..............................11 – 38
Cursor keys ..................................2 – 9, 3 – 2, 4 –2
C-weighting ....................................................1 –5
D
D/A converter .................................................1 –5
DAT recorder .................................................4 –8
Data
files ...................................1 – 10, 1 –12, 1 – 13
extension ..........................................1 – 13
menu ..........................................2 – 8, 6 –4
number of .........................................1 – 13
set-up data .......................................1 – 13
system .................................................6 –2
Files pushkey .........................2 – 8, 6 – 7, 7 –3
separator ................................................11 –8
types .......................................................11 –9
character ........................................11 – 10
numeric ...........................................11 – 10
string ..............................................11 – 12
Date and time
information ..............................................6 –2
setting .......................................................3 –4
DC Output ............................................4 – 9, 7 –6
Decimal separator .....................................11 – 24
Default
measurement set-up ..............................4 – 13
parameters ....................................2 – 5, 10 –4
set-up ........................................................2 –5
Delete
all files ......................................................6 –9
files ...........................................................6 –9
Detectors . 1 – 5, 2 – 10, 4 –5, 9 –3, 11 – 23, 11 – 25
Peak ..........................................................1 –5
RMS ..........................................................1 –5
setting up
bandwidth ..........................................4 –5
frequency weighting ..........................4 –5
Diffuse sound field .........................................4 –7
Disk Summary ...............................................6 –9
Display ..................................................3 – 7, 9 –4
Displayed parameters .................................5 – 11
Dose
levels .......................................................4 – 11
percentage ................................................1 –9
Dose%X ..........................................................1 –9
Dose%XY4 ......................................................1 –9
2238 Mediator
User Manual
Brüel & Kjær
Index
Dose%XY5 ..................................................... 1 – 9
Dynamic range .............................................. 4 – 3
E
EA .................................................................. 1 – 8
Effect of accessories ...................................... 9 – 5
Elapsed time ......................................... 1 – 9, 6 – 3
EMC ...................................................... 9 – 5, 9 – 6
Enhanced SLM Software ..................... 1 – 6, 3 – 4
Environmental effects ................................... 9 – 4
Error
list of interface ...................................... 10 – 8
messages .............................................. 10 – 11
Error? query .............................................. 11 – 18
Evaluator .......................................... 7 – 4, 11 – 15
Exchange rate .............. 4– 4, 4 – 11, 5 – 11, 10 – 2
Exchange_Rate command ........................ 11 – 36
Exchange_Rate? query ............................. 11 – 38
Explicit point scaled representation ........ 11 – 11
Exposure time .................................. 4 – 11, 10 – 2
Exposure_Time command ........................ 11 – 36
Exposure_Time? query ............................. 11 – 38
External
DC supply ................................................ 9 – 4
power socket ............................................ 2 – 4
power supply ........................................... 2 – 4
F
Fast (F) .......................................................... 1 – 5
Field
parameter .............................................. 2 – 12
value ...................................................... 2 – 12
File
delete ........................................................ 6 – 9
extension .................................................. 6 – 2
list ................................................... 6 – 7, 6 – 8
Manager ................................. 2 – 8, 6 – 4, 6 – 7
Options Window ................................ 6 – 8
names ....................................................... 6 – 2
print ................................................ 6 – 6, 6 – 8
recall ........................................................ 6 – 8
size ........................................................... 6 – 7
store ......................................................... 6 – 5
File command ............................................ 11 – 19
File_Copy query ........................................ 11 – 19
File_DElete query ..................................... 11 – 20
File_DIrectory? query ............................... 11 – 21
File_SAve query ........................................ 11 – 23
File_Space? query ..................................... 11 – 22
Filter set ......................... 1 – 4, 1 – 7, 4 – 5, 11 – 17
Fitting batteries ............................................ 2 – 2
Flash RAM ......................................... 1– 13, 2 – 4
Formats for interface messages ................. 11 – 4
Frequency
Analysis Software ................. 1 – 4, 1 – 5, 3 – 4
response ................................................... 9 – 3
BB1119 – 11
weighting ..1 – 5, 1 – 7, 4 – 5, 4 –8, 5– 11, 7 – 6,
9–3
Frequency_Weighting_1 command .......... 11 – 23
Frequency_Weighting_1? query ............... 11 – 24
Frequency_Weighting_2 command .......... 11 – 25
Frequency_Weighting_2? query ............... 11 – 25
Frontal setting .............................................. 5 –3
G
General
measurement parameters ....................... 4 –3
specifications ........................................... 9 –2
Window ......................................... 4 – 3, 4 – 11
Getting started .............................................. 2 –2
H
Handshake ..................... 3 –6, 7 –3, 7– 4, 11 – 15
Hardwired ........................................ 3– 6, 11 – 15
Header
long ...................................................... 11 – 14
path ........................................................ 11 –4
separator ................................................ 11 –8
short ..................................................... 11 – 14
How Mediator works ..................................... 1 –4
Hydrophone ................................................... 5 –3
I
Identify? query .......................................... 11 – 26
Illegal entry ...................................... 1– 11, 2 – 12
Implicit point representation ................... 11 – 10
Impulse (I) ..................................................... 1 –5
Indicator range .............................................. 9 –2
Inherent noise ...................................... 9 –2, 9 –5
Initial
calibration parameters ......................... 1 – 13
Input/Output
function .................................................... 4 –8
Window .................................................... 4 –8
Instantaneous value ................................... 5 – 11
Interface
error .......................................... 10– 8, 11 – 28
message formats .................................... 11 –4
parameters (setting up) ................. 3 –5, 7 –3
International standards ............................... 3 –8
J
Joining messages ........................................ 11 –5
K
Key
command ............................................. 11 – 27
position ................................................ 11 – 27
2238 Mediator
User Manual
12 –45
Index
L
Language
changing ........................................2 –12, 9 – 4
setting up .................................................3 – 7
Latched overload .........................................2– 11
LAV ...................................................4 – 11, 10 – 2
LAV5 ............................................................10 – 2
LCD screen ....................................................3 – 7
LDOD .............................................................4 – 5
Left/Right Arrow pushkey ............................2 – 9
Light (backlight) ..........................................1– 14
Linear weighting ...........................................1 – 5
Logging SLM Software .........................1 – 5, 3 – 4
Long header ...............................................11– 14
LOSHA ................................................4 –5, 10 – 2
LXAV ..............................................................4 – 5
LXE ................................................................1 – 8
LXep,d ............................................................1 – 8
LXeq ...............................................................1 – 8
LXpk ...............................................................1 – 9
LXpkMax .......................................................6 – 4
LXpkmax ........................................................1 – 9
LXYav4 ...........................................................1 – 8
LXYav5 ...........................................................1 – 8
LXYinst ..........................................................1 – 8
LXYmax .........................................................1 – 8
LXYmin ..........................................................1 – 8
LXYp ..............................................................1 – 8
M
Maintenance and repair ................................8 – 2
Measurement
Control Window .......................................4 – 6
data ................................................1 –13, 6 – 3
parameters ..................................1 – 7, 11– 34
range ........ 1 – 12, 2 – 9, 2 – 11, 4 – 3, 9 – 2, 9 – 5
Result pushkey ......... 1 – 11, 2 –9, 2 –13, 3 – 3
settings ............................................3 – 2, 4 – 2
set-up .................................. 1 – 13, 4 –12, 6 – 3
set-up (default) .......................................4– 13
Set-up menu .............. 1 – 10, 1 –11, 2 – 9, 4 – 2
Window ... 1 – 7, 1 – 10, 2 – 2, 2 – 5, 2 – 9, 2 – 10,
3 –3, .............................................4 –4, 5– 11
Memory ....................................1 – 12, 1 –13, 9 – 4
Menu
items (selecting) .......................................2 – 9
keys .........................................................1– 10
structure .................................................1– 10
Message
compound ...............................................11 – 4
from the Mediator ..................................11 – 6
header .....................................................11 – 4
joining .....................................................11 – 5
sub-header ..............................................11 – 4
syntax .....................................................11 – 6
terminator ...................................11 –4, 11 – 9
to the Mediator ......................................11 – 4
12 –46
Messages and warnings ..............................10 –5
Microphone ..................................1 – 4, 5 – 3, 9 –2
extension cable ................................2 – 7, 5 –2
preamplifier ....................................1 – 4, 9 –2
type ...........................................................6 –3
Minimum code (mnemonics) ............11 – 6, 11 –8
Mnemonics ............................. 11 – 6, 11 – 7, 11 –8
Modem ............................................................3 –6
N
Navigation ...................................................1 – 10
Noise Explorer ..................................7 –4, 11 – 15
Non-volatile memory ...................................1 – 13
NR1, NR2, NR3 .........................................11 – 10
Null-modem cable ..........................................1 –4
Number of
data files ........................................1 – 13, 6 –2
peaks ...............................................1 – 9, 6 –4
Numbering files .............................................6 –2
Numeric data ..................................11 –9, 11 – 10
O
Occupational Health
parameters .............................................4 – 11
Window ...................................................4 – 11
Octave filters .................................................1 –5
Operating time ..............................................2 –3
OSHA ...........................................................10 –2
Output
AC .............................................................7 –6
DC .............................................................7 –6
Overall results ...............................................6 –3
Overload ............................ 2– 11, 4 – 4, 6 – 4, 9 –3
warning ....................................................4 –4
Overload% ......................................................1 –9
P
Parameter ......................................................1 –7
changing the displayed ..........................5 – 11
default ....................................................10 –4
fields .......................................................2 – 12
header .....................................................11 –8
selecting ...................................................2 –9
text ............................................................1 –3
PArameter? query .....................................11 – 29
Pause
Continue pushkey ..................................2 – 10
mode ........ 2 – 5, 2 – 8, 2 – 9, 3 – 2, 6 –4, 11 – 32
PAUse command .......................................11 – 32
Peak
detector .....................................................1 –5
data ................................. 1 – 14, 6 – 3, 6 –4
weighting .....................................4 –5, 11 – 25
Peaks Over
indication .................................................4 –4
value .........................................................4 –4
2238 Mediator
User Manual
Brüel & Kjær
Index
Peaks_Over command .............................. 11 – 36
Peaks_Over? query ................................... 11 – 38
Power pushkey .............................................. 2 – 8
Prepolarized microphone ............ 1 – 4, 5 – 3, 9 – 2
Preset Time ................................................... 4 – 7
Preset_Time command ............................. 11 – 36
PReset_Time? query ................................. 11 – 38
Print
a measurement ........................................ 7 – 3
files .................................................. 6 – 6, 6 – 8
Options list .............................................. 6 – 5
Window .................................................... 6 – 8
Printer
interface parameters (setting up) ........... 3 – 6
Interface Window .................................... 3 – 6
Program message
terminator .................................. 11– 5, 11 – 9
unit separator ........................................ 11 – 5
Protective cover ............................................. 1 – 4
Protector ........................................... 7 – 4, 11 – 15
Protocol ...................................................... 11 – 13
Pushkeys
Backlight ............................................... 2 – 10
Calibrate .................................................. 2 – 8
Cancel .................................................... 2 – 10
Data Files ................................................ 2 – 8
definitions ................................................ 2 – 8
Left/Right Arrow ..................................... 2 – 9
Meas. Result ............................................ 2 – 9
numbering ........................................... 11 – 27
Pause/Continue ..................................... 2 – 10
pictograms ...................................... 1 – 3, 2 – 8
Power ....................................................... 2 – 8
Range ....................................................... 2 – 9
Reset ........................................................ 2 – 9
Select ...................................................... 2 – 10
Set-up ....................................................... 2 – 9
System ..................................................... 2 – 8
Up/Down Arrow ....................................... 2 – 9
Q
Quasi-analogue display ..................... 2– 10, 4 – 4
Query ............................................ 11 – 11, 11 – 13
Auto_Start_1...4? ................................. 11 – 38
Aux_1? ................................................. 11 – 38
Aux_1_FW? .......................................... 11 – 38
Aux_2? ................................................. 11 – 38
Criterion_Level? .................................. 11 – 38
Error? ................................................... 11 – 18
Exchange_Rate? .................................. 11 – 38
Exposure_Time? .................................. 11 – 38
File_Copy ............................................. 11 – 19
File_DElete .......................................... 11 – 20
File_Directory ...................................... 11 – 21
File_SAve ............................................. 11 – 23
File_Space? .......................................... 11 – 22
Frequency_Weighting_1? .................... 11 – 24
BB1119 – 11
Frequency_Weighting_2? .................... 11 – 25
Identify ................................................ 11 – 26
message overview ................................ 11 – 16
messages .............................................. 11 – 16
PArameter? .......................................... 11 – 29
Peaks_Over? ........................................ 11 – 38
PReset_Time? ...................................... 11 – 38
Random_Frontal? ................................ 11 – 38
RAnge? ................................................. 11 – 33
SEquence? ........................................... 11 – 38
SEtup? ................................................. 11 – 37
STatus? ................................................ 11 – 39
SYstem? ............................................... 11 – 40
Threshold_Level? ................................ 11 – 38
Version? ............................................... 11 – 41
Wind_Screen? ...................................... 11 – 38
R
Random_Frontal command ...................... 11 – 36
Random_Frontal? query ........................... 11 – 38
Range
pushkey ................................ 1 – 12, 2 –9, 4 –4
setting .................................................... 2 – 11
Setting window ........................................ 4 –4
RAnge command ....................................... 11 – 32
RAnge? query ............................................ 11 – 33
Recall
files ........................................................... 6 –8
Files Window ........................................... 6 –8
measurement set-up .................. 4– 12, 4 – 13
Setup Window ....................................... 4 – 13
Recall command ........................................ 11 – 36
Rechargeable batteries ................................. 2 –3
Repair ............................................................ 8 –2
REset command ........................................ 11 – 34
Reset pushkey ............................................... 2 –9
Resolution ...................................................... 9 –3
RMS
detector ........................................... 1 –5, 4 –9
weighting ................................................. 4 –5
Root header ................................................. 11 –4
RS-232 interface ............................................ 1 –4
Run/Pause indicator ................................... 2 – 12
S
SAve command .......................................... 11 – 37
Save Setup Window .................................... 4 – 12
Saved data ..................................................... 6 –3
Saving
current meas. set-up ............................. 4 – 12
measurement set-ups ............................ 4 – 12
Select pushkey ............................................ 2 – 10
Selecting
Data Files menu ...................................... 6 –4
menu items .............................................. 2 –9
parameters ..................................... 2 –9, 3 –3
Sensitivity value .................................. 5 –2, 6 –3
2238 Mediator
User Manual
12 –47
Index
SEquence command ..................................11– 37
SEquence? query .......................................11– 38
Serial
input/output .............................................9 – 4
interface .................................................11 – 4
cable ....................................................1 – 4
parameters .........................................3 – 5
socket ............................ 7 – 2, 7 – 5, 11– 15
Interface Window .....................................3 – 5
number ..........................................1 –13, 6 – 3
printer ......................................................9 – 4
Setting up
Auto Start .....................................4 –9, 4– 11
bandwidth for Detector 1 ........................4 – 5
Baud Rate ................................................3 – 5
computer interface ...............................11– 15
contrast ....................................................3 – 7
corrrection filters .....................................4 – 7
Criterion Level .......................................4– 12
date and time ...........................................3 – 4
Exposure Time .......................................4– 11
frequency weighting .......................4 – 5, 4 – 8
general measurement parameters ..........4 – 3
Handshake ...............................................3 – 6
input/output function ..............................4 – 8
interface parameters ...............................3 – 5
Language ..................................................3 – 7
measurement range .................................2 – 9
Mediator to start automatically ............5– 10
Occupational Health parameters ..........4– 11
Preset Time ..............................................4 – 7
start time for Auto Start .......................4– 10
Threshold Level .....................................4– 12
windscreen filter ......................................4 – 8
Settling time ..................................................9 – 4
Set-up
data ................................................1 –14, 6 – 3
pushkey ....................................................2 – 9
SEtup command ........................................11– 34
SEtup? query .............................................11– 37
Short header ..............................................11– 14
Shoulder bag .........................................1 – 4, 8 – 3
Slow (S) ..........................................................1 – 5
Socket
External Power ........................................2 – 4
reference to ...............................................1 – 3
Soft keys ............................1 – 3, 1 –10, 3 – 3, 4 – 2
Software package .......................................11– 19
Sound incidence
frontal .......................................................4 – 7
random .....................................................4 – 7
SPL ...............................................................5– 11
Standards ..................................... 1 – 4, 9 – 2, 9 – 4
Window .....................................................3 – 8
Start
date ...........................................................6 – 3
time ...........................................................6 – 3
STatus? query ............................................11– 39
12 –48
Store files .......................................................6 –5
Storing Mediator ...........................................8 –2
String data ......................................11 –9, 11 – 12
Sub-header ...................................................11 –4
Summary of contents ....................................1 –2
Switching
a sequence On/Off ....................................4 –7
Mediator On/Off ..............................2 – 5, 2 –8
Syntax diagrams ...............................11 – 6, 11 –7
System
information ..............................................3 –8
key ...................................................3 – 3, 4 –2
menu ................. 1 – 7, 1 – 10, 1 – 11, 2 – 8, 3 –2
pushkey ....................................................2 –8
SYstem command ......................................11 – 40
SYstem? query ...........................................11 – 40
T
Tag
files ...........................................................6 –7
parameters ...............................................6 –6
Terminator ........................................11 – 4, 11 –9
Threshold level ............................................4 – 12
Threshold_Level command .......................11 – 37
Threshold_Level? query ............................11 – 38
Time .............................................................1 – 10
weighting ..............................1 – 5, 1 – 7, 5 – 11
Transmission time .......................................11 –7
Types of data ................................................11 –9
U
Under-range ........................................2 – 10, 6 –4
Underrange% .................................................1 –9
Unknown command .....................................11 –8
Up/Down Arrow pushkey ..............................2 –9
V
Value fields ..................................................2 – 12
Version? query ...........................................11 – 41
W
Weight and dimensions .................................9 –4
Weightings Window ...........................4 – 5, 5 – 10
Wind_Screen command .............................11 – 37
Wind_Screen? query ..................................11 – 38
Windscreen ....................................................5 –3
filter ..........................................................4 –8
Word concatenator .......................................11 –8
X
X suffix ...........................................................1 –7
Y
Y suffix ...........................................................1 –7
2238 Mediator
User Manual
Brüel & Kjær
Source Exif Data:
File Type : PDF
File Type Extension : pdf
MIME Type : application/pdf
PDF Version : 1.2
Linearized : No
Create Date : 1999:02:10 11:57:01
Producer : Acrobat Distiller 3.02
Title : Untitled Document
Creator : FrameMaker 5.5.6p145
Modify Date : 1999:02:10 12:03:58
Page Count : 165
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