B&K_2232 B&K 2232

User Manual: B&K_2232

Open the PDF directly: View PDF PDF.
Page Count: 2

2232
USES
❍Community and industrial noise measurements
❍Checking compliance with noise rating recommendations
❍Traffic noise measurements
❍Front-end for other equipment
FEATURES
❍Ease of operation
❍Small and lightweight, fits in a pocket
❍Measuring range from 34 to 130dB
❍Type 1 precision
❍Equipped with a robust, high sensitivity prepolarized condenser microphone
❍Large easily-read digital display
❍DC output
Introduction
Precision Sound Level Meter Type 2232 is an inexpensive
instrument for primarily making community noise surveys
and less demanding acoustic measurements, but neverthe-
less offers the accuracy and quality associated with a pre-
cision-grade sound level meter. Its excellent ergonomic
design and ease of operation enable even the inexperi-
enced user to carry out reliable measurements quickly and
effectively. The handy convenience of a Type 1 precision
sound level meter which can be carried around in a pocket
will be appreciated by all users. A large, easily read digital
display gives a single value indication of the maximum A-
weighted sound level measured during the previous sec-
ond, thereby eliminating meter reading errors. Type 2232
is robust, compact and lightweight (460g), and is the ideal
tool for environmental health inspectors and other person-
nel concerned with maintaining acceptable noise levels in
industrial and residential locations, for instance police of-
ficers checking vehicle noise.
Sound Level Meter Type 2232 satisfies the requirements of
IEC60651 Type 1 and ANSI S1.4 1983 Type S1A.
Description
The Sound Level Meter consists basically of a microphone,
an amplifier and a detector with associated frequency and
time weighting circuits, an analogue DC output, and a dig-
ital display. Overload, underrange and low battery indica-
tors are also provided. Type
2232 is equipped with a high
sensitivity Brüel&Kjær Prepo-
larized Condenser Microphone
Type 4176 which was devel-
oped especially for use with it.
The non-removable protection
grid is internally fitted with a
fine gauze filter which provides
excellent immunity from dust
and particle penetration to the
diaphragm. Measurements
from 34 to 130dB are carried
out in two 60dB measuring
ranges: 34 to 94dB and 70 to
130dB. “F” or “S” time-weight-
ing may be selected in accord-
ance with IEC60651. Two display-reset modes allow either
a “max. hold” reading to be displayed or automatic reset-
ting every second. In the automatic mode the max. time-
weighted sound level measured during the preceding 1s is
displayed. When the manual displayreset mode is selected,
the display shows the max. time-weighted level measured
since the last manual re-set. A continuous analogue DC
output, which is proportional to the A-weighted “F” or “S”
time-weighted sound level, is provided for connection to
other equipment. Type 2232 is powered from two 9V, pref-
erably alkaline, batteries (IEC Type 6LF22) which will pro-
vide approximately 30 hours continuous operation.
Calibration of Type 2232 is easily carried out using an
external reference source such as Sound Level Calibrator
Type 4231.
PRODUCT DATA
Precision Sound Level Meter — Type 2232
BP0187
−
17 02/04 Rosendahls Bogtrykkeri
Specifications – Precision Sound Level Meter Type 2232
MEASURING RANGE
34dB to 130dB in two 60dB ranges: 34 to 94dB and 70 to 130dB
PRIMARY INDICATOR RANGE
Identical to actual display range
FREQUENCY RESPONSE
In accordance with IEC60651 Type 1.
A-weighting
DETECTOR
Characteristics: RMS indication in accordance with IEC60651, Type 1
Dynamic Range: 70dB (60dB on scale plus 10dB over)
Time Weighting: “F” and “S” to IEC/EN60651, Type 1
Crest Factor: 10dB (c.f. 3) at upper limit of display range, rising linearly
with decreasing signal level to a maximum of 26dB (c.f. 20)
DISPLAY
31/3 digit liquid crystal display with 0.1dB display resolution. Overload,
underrange and low battery warning
Read Out Interval: Updated once per second
Display Reset: “Auto.” resets once per second and displays max. time-
weighted value measured during the previous 1s. “Man.” resets when
the reset button is pressed and displays max. time-weighted value
measured since last reset
DC OUTPUT
Proportional to continuous A-weighted “F” or “S” sound level
Output Impedance: <10Ω
Nominal Output Voltage: 50mV/dB 3% (0 to 3V in both measuring ranges)
Offset: 7mV ±15mV
Minimum Load Impedance: 10kΩ
MICROPHONE
Type: Half-inch Prepolarized Condenser Microphone Type 4176
Sensitivity: 50mV/Pa (–26dB re 1V/Pa)
Cartridge Capacitance: 13pF
EFFECT OF WINDSCREEN
<0.5dB up to 10kHz
CALIBRATION
Trimmer adjustment using Sound Level Calibrator Type 4231 or
Multifunction Calibrator Type 4226
CALIBRATION REFERENCE CONDITIONS
Sound Field: Free Field Condition
Reference Incidence Direction: Perpendicular to microphone diaphragm
(0° incidence)
Reference Sound Pressure Level: 94dB re 20µPa
Reference Frequency: 1000Hz
Reference Temperature: 20°C
Reference Measuring Range: 70 to 130dB
WARM-UP TIME
4s
EFFECT OF AMBIENT TEMPERATURE (AT 1KHZ)
Operating Temperature Range: –15 to +50°C
(+5 to 122°F). Sensitivity variation of complete sound level meter <0.5dB
(re 20°C)
Microphone Temperature Coefficient: –0.004 dB/°C
Storage Temperature Range: –20 to +70°C (–4 to +158°F) without batteries
EFFECT OF MAGNETIC FIELD
<22dB for 80A/m at 50Hz
EFFECT OF HUMIDITY (AT 40°C, 1KHZ)
<0.5dB sensitivity variation for 0 to 90% R.H.
VIBRATION SENSITIVITY (10HZ TO 2KHZ)
Typically <76dB equivalent sound pressure level for vibration level of
1m/s2 applied perpendicularly to microphone diaphragm. (Typically <71dB
equivalent SPL for 1m/s2 parallel to diaphragm)
POWER SUPPLY
Two 9 V alkaline batteries (IEC Type 6LF22) or other 9 V batteries
Battery Life: Approx. 30 hours continuous operation with alkaline
batteries.
DIMENSIONS
Overall Length: 267mm (9.9in)
Overall Width: 72mm (2.8in)
Depth: 23mm (0.9in)
WEIGHT
460g (1lb.) with batteries
Compliance with Standards
Ordering Information
Type 2232 Precision Sound Level Meter
ACCESSORIES INCLUDED
Type 4176 Half-inch Prepolarized Condenser Microphone
UA0459 Windscreen
DZ9566 Random Incidence Corrector
KE0205 Leather Carrying Case
QB0016 9V Alkaline Battery (2 pieces)
JP0213 2.5mm Mini-jack Plug
ACCESSORIES AVAILABLE
Type 4231 Sound Level Calibrator
AO0481 Output Cable
UA0587 Tripod
Type 4226 Multifunction Acoustic Calibrator
CE-mark indicates compliance with: EMC Directive and Low Voltage Directive.
C-Tick mark indicates compliance with the EMC requirements of Australia and New Zealand
Safety EN 61010–1 and IEC61010–1: Safety requirements for electrical equipment for measurement, control and laboratory use.
UL3111–1: Standard for Safety – Electrical measuring and test equipment
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.
CISPR22: 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 45dB or greater will be affected by no more
than 0.5dB.
EN 50082-2: Generic immunity standard. Part 2: Industrial environment.
RF immunity implies that sound level indications of 60dB or greater will be affected by no more than 0.5dB.
Note: The EMC specifications are given for use with one AO0481 AC output cable.
EMC standards are not guaranteed to be fulfilled with cables other than the one mentioned above

Navigation menu