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®
726
Multifunction Process Calibrator
Users Manual
September 2005
© 2005 Fluke Corporation. All rights reserved.
All product names are trademarks of their respective companies.
LIMITED WARRANTY AND LIMITATION OF LIABILITY
Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is three years and
begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days. This warranty extends only to the original buyer or end-user
customer of a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in Fluke's opinion, has been misused, altered,
neglected, contaminated, or damaged by accident or abnormal conditions of operation or handling. Fluke warrants that software will operate substantially in
accordance with its functional specifications for 90 days and that it has been properly recorded on non-defective media. Fluke does not warrant that software will
be error free or operate without interruption.
Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different
warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable
international price. Fluke reserves the right to invoice Buyer for importation costs of repair/replacement parts when product purchased in one country is submitted
for repair in another country.
Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair, or replacement of a defective product which is
returned to a Fluke authorized service center within the warranty period.
To obtain warranty service, contact your nearest Fluke authorized service center to obtain return authorization information, then send the product to that service
center, with a description of the difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following warranty
repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke determines that failure was caused by neglect, misuse,
contamination, alteration, accident, or abnormal condition of operation or handling, including overvoltage failures caused by use outside the product’s specified
rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair costs and obtain authorization before commencing the work.
Following repair, the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges (FOB
Shipping Point).
THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE FOR
ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR
THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or limitation of incidental or consequential damages, the
limitations and exclusions of this warranty may not apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other
decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision.
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
11/99
i
Table of Contents
Title Page
Introduction.................................................................................................................... 1
Contacting Fluke............................................................................................................ 1
Standard Equipment...................................................................................................... 3
Safety Information ......................................................................................................... 3
Symbols.................................................................................................................... 7
Getting Acquainted with the Calibrator.......................................................................... 8
Input and Output Terminals ...................................................................................... 8
Keys.......................................................................................................................... 10
Display...................................................................................................................... 13
Configuration Menus ..................................................................................................... 14
Contrast Adjustment ................................................................................................. 14
Shut Down Mode ...................................................................................................... 15
CJC........................................................................................................................... 15
Celcius and Fahrenheit (°C and °F).......................................................................... 15
Frequency Pulse Output Voltage.............................................................................. 15
Pulse Output Frequency........................................................................................... 15
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Users Manual
ii
HART
Resistor ON/OFF.......................................................................................... 16
Getting Started............................................................................................................... 16
Voltage to Voltage Test............................................................................................. 16
Using Measure Mode..................................................................................................... 18
Measuring Electrical Parameters (Upper Display) .................................................... 18
Current Measurement with Loop Power.................................................................... 18
Measuring Electrical Parameters (Lower Display) .................................................... 20
Measuring Temperature............................................................................................ 21
Using Thermocouples........................................................................................... 21
Using Resistance-Temperature Detectors (RTDs)............................................... 24
PRT Custom Curves ................................................................................................. 24
Measuring Pressure .................................................................................................. 27
Zeroing with Absolute Pressure Modules.................................................................. 28
Using Source Mode........................................................................................................ 30
Sourcing 4 to 20 mA.................................................................................................. 30
Simulating a 4- to 20-mA Transmitter........................................................................ 30
Sourcing Other Electrical Parameters....................................................................... 32
Simulating Thermocouples........................................................................................ 34
Simulating RTDs ....................................................................................................... 36
Sourcing Pressure..................................................................................................... 38
Setting 0 % and 100 % Output Parameters ................................................................... 41
% Error Functionality................................................................................................. 41
Stepping and Ramping the Output................................................................................. 41
Manually Stepping the mA Output............................................................................. 42
Auto Ramping the Output.......................................................................................... 42
Storing and Recalling Setups......................................................................................... 42
Store a Setup ............................................................................................................ 42
Recall a Setup........................................................................................................... 43
Contents
(continued)
iii
Storing and Recalling Data............................................................................................ 43
Storing Data.............................................................................................................. 43
Recall Data ............................................................................................................... 44
Pulse Train Source/Read .............................................................................................. 44
Calibrating a Transmitter ............................................................................................... 45
Calibrating a Pressure Transmitter................................................................................ 47
Calibrating an I/P Device............................................................................................... 49
Pressure Switch Test..................................................................................................... 51
Testing an Output Device.............................................................................................. 51
Remote Control Commands .......................................................................................... 52
HART
Functionality...................................................................................................... 52
Maintenance.................................................................................................................. 53
Replacing the Batteries............................................................................................. 53
Cleaning the Calibrator............................................................................................. 54
Service Center Calibration or Repair ........................................................................ 54
Replacement Parts ................................................................................................... 54
Accessories ................................................................................................................... 56
External Fluke Pressure Module Compatibility ......................................................... 56
Specifications ................................................................................................................ 59
DC Voltage Measurement and Source ..................................................................... 59
DC mA Measurement and Source............................................................................ 59
Ohms Measurement ................................................................................................. 60
Ohms Source............................................................................................................ 60
Frequency Measurement.......................................................................................... 60
Frequency Source .................................................................................................... 61
Temperature, Thermocouples .................................................................................. 61
RTD Accuracy (Read and Source) (ITS-90) ............................................................. 63
726
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iv
Loop Power Supply ................................................................................................... 64
Pulse Read and Pulse Source .................................................................................. 64
Pressure Measurement............................................................................................. 64
General Specifications .............................................................................................. 65
Index
v
List of Tables
Table Title Page
1. Summary of Source and Measure Functions ....................................................................... 2
2. International Symbols ........................................................................................................... 7
3. Input/Output Terminals and Connectors............................................................................... 9
4. Key Functions....................................................................................................................... 11
5. Thermocouple Types Accepted............................................................................................ 22
6. RTD Types Accepted............................................................................................................ 25
7. mA Step Values.................................................................................................................... 42
8. Replacement Parts ............................................................................................................... 54
9. Fluke Pressure Module Compatibility ................................................................................... 56
10. Pressure Modules................................................................................................................. 57
726
Users Manual
vi
vii
List of Figures
Figure Title Page
1. Standard Equipment............................................................................................................. 6
2. Input/Output Terminals and Connectors............................................................................... 8
3. Keys...................................................................................................................................... 10
4. Elements of a Typical Display .............................................................................................. 13
5. Adjusting the Contrast .......................................................................................................... 14
6. Voltage-to-Voltage Test........................................................................................................ 17
7. Measuring Voltage and Current Output................................................................................ 18
8. Connections for Supplying Loop Power................................................................................ 19
9. Measuring Electrical Parameters.......................................................................................... 20
10. Measuring Temperature with a Thermocouple..................................................................... 23
11. Measuring Temperature with an RTD, Measuring 2-, 3-, and 4-Wire Resistance ................ 26
12. Gage and Differential Pressure Modules.............................................................................. 27
13. Connections for Measuring Pressure ................................................................................... 29
14. Connections for Simulating a 4- to 20-mA Transmitter......................................................... 31
15. Electrical Sourcing Connections........................................................................................... 33
16. Connections for Simulating a Thermocouple........................................................................ 35
17. Connection for Simulating a 3- and 4-Wire RTD .................................................................. 37
726
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viii
18. Connections for Sourcing Pressure ...................................................................................... 40
19. SAVE DATA Menu Showing Measurement Memory Location 3, 1....................................... 44
20. Calibrating a Thermocouple Transmitter............................................................................... 46
21. Calibrating a Pressure-to-Current (P/I) Transmitter .............................................................. 48
22. Calibrating a Current-to-Pressure (I/P) Transmitter .............................................................. 50
23. Calibrating a Chart Recorder ................................................................................................ 52
24. Replacing the Batteries ......................................................................................................... 53
25. Replacement Parts................................................................................................................ 55
1
Multifunction Process Calibrator
Introduction
The Fluke 726 Multifunction Process Calibrator (referred
to as “the Calibrator”) is a handheld, battery-operated
instrument that measures and sources electrical and
physical parameters. See Table 1.
In addition to the functions in Table 1, the Calibrator also
has the following features and functions:
• A split-screen display. The upper display allows
users to measure volts, current, and pressure only.
The lower display allows the user to measure and
source volts, current, pressure, resistance
temperature detectors, thermocouples, frequency,
and ohms.
• A thermocouple (TC) input/output terminal and
internal isothermal block with automatic reference-
junction temperature compensation.
• Stores and recalls setups.
• Manual and automatic stepping and ramping.
• Stores and recalls calibration screens.
• Control the Calibrator remotely from a PC running a
terminal emulator program.
Contacting Fluke
To order accessories, receive operating assistance, or
locate the nearest Fluke distributor or Service Center,
call:
USA: 1-888-44-FLUKE (1-888-443-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: +31 402-675-200
Japan: +81-3-3434-0181
Singapore: +65-738-5655
Anywhere in the world: +1-425-446-5500
USA Service: 1-888-99-FLUKE (1-888-993-5853)
Or, visit Fluke's Web site at www.fluke.com.
To register your product, visit register.fluke.com
726
Users Manual
2
Table 1. Summary of Source and Measure Functions
Function Measure Source
dc V 0 V to 30 V 0 V to 20 V
dc mA 0 to 24 mA 0 to 24 mA
Frequency 2 CPM to 15 kHz 2 CPM to 15 kHz
Resistance 0 Ω to 4000 Ω 5 Ω to 4000 Ω
Thermocouple Types E, J, K, T, B, R, S, L, U, N, C, XK, BP
RTD
(Resistance-
Temperature
Detector)
Pt100 Ω (385)
Pt100 Ω (3926)
Pt100 Ω (3916)
Pt200 Ω (385)
Pt500 Ω (385)
Pt1000 Ω (385)
Ni120 (672)
CU10
Pressure 29 modules ranging from 1.0 in. H2O to 10,000 psi
Pulse 1-100,000
Freqency Max 10 kHz
1-10,000
Frequency Range 2 CPM to 10 kHz
Other functions Loop supply, HART resistor, pressure switch test, save screen, step, ramp, memory, cold
junction compensation
Multifunction Process Calibrator
Standard Equipment
3
Standard Equipment
If the Calibrator is damaged or something is missing,
contact the place of purchase immediately. To order
replacement parts, see Table 8. The items listed below
and shown in Figure 1 are included with the Calibrator.
• TL75 test leads
• AC72 alligator clips
• Stackable alligator clip test leads
•
726 Product Overview
(not shown in Figure 1)
•
725/726 CD-ROM
(contains Users Manual; not
shown in Figure 1)
• 4 AA Batteries (installed)
Safety Information
The Calibrator is designed in accordance with CAN/CSA-
C22.2 NO. 61010-1-04, UL 61010-1, and ISA 82.02.01
XW Warning
To avoid possible electric shock or personal
injury, use the Calibrator only as specified in
this manual, otherwise the protection
provided by the Calibrator may be impaired.
A Warning identifies conditions and actions that pose
hazard(s) to the user. A Caution identifies conditions and
actions that may damage the Calibrator or the equipment
under test.
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Users Manual
4
XW Warning
To avoid possible electric shock or personal injury:
• Use the Calibrator only as described in the Users Manual or the protection provided by the Calibrator
may be impaired.
• Do not apply more than the rated voltage, as marked on the Calibrator, between the terminals, or
between any terminal and earth ground (30 V 24 mA max all terminals).
• Before each use, verify the Calibrator’s operation by measuring a known voltage.
• Follow all equipment safety procedures.
• Use the proper terminals, mode, and range for the measuring or sourcing application.
• Never touch the probe to a voltage source when the test leads are plugged into the current terminals.
• Do not use the Calibrator if it is damaged. Before using the Calibrator, inspect the case. Look for cracks
or missing plastic. Pay particular attention to the insulation surrounding the connectors.
• Select the proper function and range for the measurement.
• Make sure the battery door is closed and latched before operating the Calibrator.
• Remove test leads from the Calibrator before opening the battery door.
• Inspect the test leads for damaged insulation or exposed metal. Check test lead continuity. Replace
damaged test leads before using the Calibrator.
• When using the probes, keep your fingers away from the probe contacts. Keep fingers behind the finger
guards on the probes.
• Connect the common test lead before connecting the live test lead. When disconnecting the test leads,
disconnect the live test lead first.
• Do not use the Calibrator if it operates abnormally. Protection may be impaired. When in doubt, have the
Calibrator serviced.
• Do not operate the Calibrator around explosive gas, vapor, or dust.
Multifunction Process Calibrator
Safety Information
5
• When using a pressure module, make sure the process pressure line is shut off and depressurized
before connecting it or disconnecting it from the pressure module.
• Use only 4 AA batteries, properly installed in the Calibrator case, to power the Calibrator.
• Disconnect test leads before changing to another measure or source function.
• When servicing the Calibrator, use only specified replacement parts.
• To avoid false readings, which could lead to possible electric shock or personal injury, replace the
battery as soon as the battery indicator (M) appears.
• Turn off circuit power before connecting the Calibrator mA and COM terminals in the circuit. Place
Calibrator in series with the circuit.
• Do not allow water into the case.
WCaution
To avoid possible damage to the Calibrator or to equipment under test:
• Disconnect the power and discharge all high-voltage capacitors before testing resistance or continuity.
• Use the proper input jacks, function, and range for the measurement or sourcing application.
726
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6
V
mA
MEASURE
SOURCE / MEASURE
30V MAX ALL TERMINALS
4W
3W
V
Hz
RTD
mA+
mA-
TC
COM COM
LOOP
100%
25%
25%
0%
SAVE
RECALL
FREQ
ENTER
EXIT CONFIG
TC
RTD PULSE
TRIGGER/STOP
CONFIG
SELECTION
Return to
Recall
Stackable
Test Leads
TL75
Test Lead Set
AC72
Alligator Clips
bec01f.eps
Figure 1. Standard Equipment
Multifunction Process Calibrator
Safety Information
7
Symbols
Symbols used on the Calibrator and in this manual are explained in Table 2.
Table 2. International Symbols
B AC - Alternating current T Double insulated
F DC - Direct current M Battery
J Earth ground W Risk of danger. Important information. See
Manual. Precedes Warning.
f Pressure O Power ON/OFF
P Conforms to European Union directives X Hazardous Voltage. Precedes Warning.
) Conforms to Canadian Standards Association directives.
726
Users Manual
8
Getting Acquainted with the Calibrator
Input and Output Terminals
Figure 2 shows the Calibrator input and output terminals.
Table 3 explains their use.
726 PRECISION CALIBRATOR
0%
25%
25%
SAVE
RECALL
Return to
Recal
FREQ
MEAS
SOURCE
ENTER
EXIT CONFIG
HART
TC
RTD PULSE
V mA
V mA
LOOP SWITCH
TEST
100%
%Error ZERO
3 Seconds
OPEN/CLOSE
TRIGGER/STOP
CONFIG
SELECTION
Return to
Recall
7
8
654
3
2
1
bec05f.eps
Figure 2. Input/Output Terminals and Connectors
Multifunction Process Calibrator
Getting Acquainted with the Calibrator
9
Table 3. Input/Output Terminals and Connectors
No Name Description
A Pressure module
connector/serial connector
Connects the Calibrator to a pressure module or to a PC for a remote control
serial connection.
B, C MEASURE V, mA terminals Input terminals for measuring voltage, current, supplying loop power, HART
resistance, switch test options.
D Thermocouple (TC)
input/output
Terminal for measuring or simulating thermocouples. This terminal accepts a
miniature polarized thermocouple plug with flat, in-line blades spaced 7.9 mm
(0.312 in) center to center.
E, F
SOURCE/ MEASURE V,
RTD, Pulse, Hz, Ω terminals Terminals for sourcing or measuring voltage, resistance, pulse, frequency, and
RTDs.
G, H SOURCE/ MEASURE mA
terminals, 3W, 4W
Terminals for sourcing and measuring current and performing 3 W and 4 W RTD
measurements. HART resistor option in mA mode.
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Users Manual
10
Keys
Figure 3 shows the Calibrator keys and Table 4 explains their use.
726
PRECISION CALIBRATOR
0%
25%
25%
SAVE
RECALL
Return to
Recallurn to
Recal
FREQ
MEAS
SOURCE
ENTER
EXIT CONFIG
HART
TC
RTD PULSE
V mA
V mA
LOOP SWITCH
TEST
100%
%Error ZERO
3 Seconds
OPEN/CLOSE
TRIGGER/STOP
CONFIG
SELECTION
726
PRECISION CALIBRATOR
0%
25%
25%
SAVE
RECALL
Return to
Recal
FREQ
MEAS
SOURCE
ENTER
EXIT CONFIG
HART
TC
RTD PULSE
V mA
V mA
LOOP SWITCH
TEST
100%
%Error ZERO
3 Seconds
OPEN/CLOSE
TRIGGER/STOP
CONFIG
SELECTION
18
9
10
2
3
46
7
5
12 11
13
14
15
16
17
18
19
20
bec41f.eps
Figure 3. Keys
Multifunction Process Calibrator
Getting Acquainted with the Calibrator
11
Table 4. Key Functions
No Name Description
A O Turns the power on or off.
B %Error
l Toggles voltage, mA, or Loop Power and % Error measurement functions in the upper display.
C ZERO
3 Seconds
A
Selects the pressure measurement function in the upper display. Repeated pushes cycle through the
different pressure units. Zeros pressure when held for 3 seconds.
D OPEN/CLOSE
Q Activates the switch test.
E C Turns backlight on or off.
F K Selects frequency sourcing or measurement.
G P Selects pulse sourcing or measurement.
H EXIT CONFIG
G
Recalls a source value from memory corresponding to 100 % of span and sets it as the source value.
Press and hold to store the source value as the 100 % value.
Exits Configuration Menu.
I H Increments output by 25 % of span.
J I Decrements output by 25 % of span.
K J Recalls from memory a source value corresponding to 0 % of span and sets it as the source value.
Press and hold to store the source value as the 0 % value.
Press and hold when powering up to identify the firmware version. The firmware version is shown in the
upper display for about 1 second after initialization.
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Table 4. Key Functions (cont.)
No Name Description
L TRIGGER/STOP
L
Cycles through :
E Slow repeating 0 % - 100 % - 0 % ramp
P Fast repeating 0 % - 100 % - 0 % ramp
N Repeating 0 % - 100 % - 0 % ramp in 25 % steps
Used for the pulse train and totalizer functions.
M XW Y Z
Return to
Recall
Increases or decreases the source level.
Cycles through the 2-, 3-, and 4-wire selections.
Moves through the memory locations of Calibrator setups.
Moves through the configuration menus.
N S
ENTER Saves and recalls setups & data.
ENTER is used in the configuration menus.
O C Used to enter and navigate the configuration menus.
P M Cycles the Calibrator through MEASURE and SOURCE modes in the lower display.
Q T Selects TC (thermocouple) measurement and sourcing function in the lower display. Repeated
pushes cycle through the thermocouple types.
R HART
V
Toggles between voltage, mA sourcing, or mA simulate functions in the lower display.
Inserts a 250 Ω resistor when in mA.
S R Selects RTD (resistance temperature detector) measurement and sourcing function in lower
display. Repeated pushes cycle through the RTD types. Selects resistance mode.
T U Selects the pressure measurement and sourcing function. Repeated pushes cycle through the
different pressure units.
Multifunction Process Calibrator
Getting Acquainted with the Calibrator
13
Display
Figure 4 shows the elements of a typical display.
Low Battery
Symbol
Loop
Indicator
Memory Locations
for Calibrator Setups
Units
Display
Auto
Ramp
Mode
Indicator
HART Mode
Indicator
% Error
Indicators
bec07f.eps
Figure 4. Elements of a Typical Display
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14
Configuration Menus
Use the configuration menus to set or change these
parameters of the Calibrator:
• Contrast Adjustment
• Shut Down Mode
• CJC on/off
• °C/°F
• Frequency/Pulse output voltage
• Pulse output frequency
• HART resistor on/off
To enter the configuration menus, press C. Press
S, to save new configuration. Press G/EXIT
CONFIG to exit configuration.
Configuration menus are explained below.
Contrast Adjustment
To adjust the contrast (see Figure 5):
1. Press C until Contst Adjust appears on the
display.
2. Use X and W to adjust the contrast up and down.
3. Press S to save the setting.
726 PRECISION CALIBRATOR
0%
25%
25%
SAVE
RECALL
Return to
Recal
FREQ
MEAS
SOURCE
ENTER
EXIT CONFIG
HART
TC
RTD PULSE
V mA
V mA
LOOP SWITCH
TEST
100%
%Error ZERO
3 Seconds
OPEN/CLOSE
TRIGGER/STOP
CONFIG
SELECTION
Return to
Recall
1
2
3
bec06f.eps
Figure 5. Adjusting the Contrast
Multifunction Process Calibrator
Configuration Menus
15
Shut Down Mode
The Calibrator comes with a shut down mode set for 30
minutes (displayed for about 1 second when the
Calibrator is initially turned on). When shut down mode is
enabled, the Calibrator automatically shuts down after
the elapsed time from when the last key was pressed.
1. Press C until SHUT DOWN appears on the
display.
2. Use X and W to increase or decrease the time.
3. Press S to save the setting.
CJC
Cold Junction Compensation (CJC) is a value for the cold
end of a thermocouple at the Meter’s end.
1. Press C until SELECT CJC appears on the
display.
2. Use Y and Z to select ON or OFF.
3. Press S to save the setting.
Celcius and Fahrenheit (
°
C and
°
F)
1. Press C until SELECT UNIT °C (or °F) appears
on the display.
2. Use X and W to select °C or °F.
3. Press S to save the setting.
Frequency Pulse Output Voltage
1. Press C until FREQ OUTPUT V Adjust appears
on the display.
2. Use X, W, Y and Z to adjust the frequency pulse
output voltage from 1 to 20 V.
3. Press S to save the setting.
Pulse Output Frequency
1. Press C until PULSE OUTPUT Hz FREQ Adjust
appears on the display.
2. Use X, W, Y and Z to adjust the pulse output
frequency from 2 CPM to 15 kHz.
3. Press S to save the setting.
726
Users Manual
16
HART
Resistor ON/OFF
1. Press C until SELECT HART ON or OFF
appears on the display.
2. Use V to toggle ON or OFF.
3. Press S to save the setting.
Note
When HART mode is selected, the 250
Ω
resistor is turned on both mA channels.
Getting Started
This section details some basic operations of the
Calibrator.
Voltage to Voltage Test
To perform a voltage-to-voltage test:
1. Connect the Calibrator’s voltage output to its voltage
input as shown in Figure 6.
2. Press O to turn on the Calibrator. Press l to
select dc voltage (upper display).
3. If necessary, press M for SOURCE mode (lower
display). The Calibrator is still measuring dc voltage,
the active measurements are visible in the upper
display.
4. Press V to select dc voltage sourcing.
5. Press Y and Z to select a digit to change. Press X
to select 1 V for the output value. Press and hold
J to enter 1 V as the 0 % value.
6. Press X to increase the output to 5 V. Press and
hold G to enter 5 V as the 100 % value.
7. Press H and I to step between 0 and 100 %
in 25 % step increments.
Multifunction Process Calibrator
Getting Started
17
100%
25%
25%
MEAS
SOURCE
0%
726
PRECISION CALIBRATOR
SAVE
RECALL
FREQ
ENTER
EXIT CONFIG
HART
TC
RTD PULSE
V mA
V mA
LOOPSWITCH
TEST
%Error ZERO
3 Seconds
OPEN/CLOSE
TRIGGER/STOP
CONFIG
SELECTION
bec39f.eps
Figure 6. Voltage-to-Voltage Test
726
Users Manual
18
Using Measure Mode
Measuring Electrical Parameters (Upper Display)
To measure the current or voltage output of a transmitter,
or to measure the output of a 700 Series pressure
module, use the upper display and proceed as follows:
1. Press l to select volts or current. LOOP should
not be on.
2. Connect the leads as shown in Figure 7.
Current Measurement with Loop Power
The loop power function activates a 24 V supply in series
with the current measuring circuit, allowing you to test a
transmitter when it is disconnected from plant wiring. To
measure current with loop power:
1. Connect the Calibrator to the transmitter current loop
terminals as shown in Figure 8.
2. Press l while the Calibrator is in current
measurement mode. LOOP appears and an internal
24 V loop supply turns on.
Note
When HART resistor mode is selected, the
250
Ω
resistor is turned on both mA channels.
bec42f.eps
Figure 7. Measuring Voltage and Current Output
Multifunction Process Calibrator
Using Measure Mode
19
726
PRECISION CALIBRATOR
0%
25%
25%
SAVE
RECALL
Return to
Recall
FREQ
MEAS
SOURCE
EXIT CONFIG
HART
TC
RTD PULSE
V mA
V mA
LOOP SWITCH
TEST
100%
%Error ZERO
3 Seconds
OPEN/CLOSE
TRIGGER/STOP
CONFIG
SELECTION
Red
TEST DC PWR
+–+–
–+
Black
HART
Communicator
ENTER
bec18f.eps
Figure 8. Connections for Supplying Loop Power
726
Users Manual
20
Measuring Electrical Parameters (Lower Display)
To measure electrical parameters using the lower display,
proceed as follows:
1. Connect the Calibrator as shown in Figure 9.
2. If necessary, press M for MEASURE mode (lower
display).
3. Press V for dc voltage or current, K for
frequency, and Rfor resistance.
726
PRECISION CALIBRATOR
0%
25%
25%
SAVE
RECALL
Return to
Recal
FREQ
MEAS
SOURCE
ENTER
EXIT CONFIG
HART
TC
RTD PULSE
V mA
V mA
LOOP SWITCH
TEST
100%
%Error ZERO
3 Seconds
OPEN/CLOSE
TRIGGER/STOP
CONFIG
SELECTION
Black
Red
bec43f.eps
Figure 9. Measuring Electrical Parameters
Multifunction Process Calibrator
Using Measure Mode
21
Measuring Temperature
Using Thermocouples
The Calibrator supports 13 standard thermocouples.
Table 5 summarizes the ranges and characteristics of
each.
To measure temperature using a thermocouple:
1. Select Celsius or Fahrenheit, depending on the
desired measurement. Refer to “Configuration
Menus” for more information.
2. Attach the thermocouple leads to the appropriate TC
miniplug, then to the TC input/output as shown in
Figure 10.
W Caution
One pin is wider than the other. Do not try to force a
miniplug into the wrong polarization.
Note
If the Calibrator and the thermocouple plug are at
different temperatures, wait one minute or more
for the connector temperature to stabilize after
plugging the miniplug into the TC input/output.
3. If necessary, press M for MEASURE mode.
4. Press T for the thermocouple display. Continue
pressing this key to select the desired thermocouple
type.
726
Users Manual
22
Table 5. Thermocouple Types Accepted
Type
Positive Lead
Positive Lead (H)
Color
Negative Lead
Specified Range
Material ANSI* IEC** Material (°C)
E Chromel Purple Violet Constantan -200 to 950
N Ni-Cr-Si Orange Pink Ni-Si-Mg -200 to 1300
J Iron White Black Constantan -200 to 1200
K Chromel Yellow Green Alumel -200 to 1370
T Copper Blue Brown Constantan -200 to 400
B Platinum (30 % Rhodium) Gray Platinum (6 % Rhodium) 600 to 1800
R Platinum (13 % Rhodium) Black Orange Platinum -20 to 1750
S Platinum (10 % Rhodium) Black Orange Platinum -20 to 1750
L Iron Constantan -200 to 900
U Copper Constantan -200 to 400
C Tungsten 5% Rhenium White None Tungsten 26% Rhenium 0 to 2316
GOST
BP 90.5 % Ni + 9.5 % Cr Violet or Black 56 % Cu + 44 % Ni -200 to 800
XK 95 % W + 5 % Re Red or Pink 80 % W + 20 % Re 0 to 2500
*American National Standards Institute (ANSI) device negative lead (L) is always red.
**International Electrotechnical Commission (IEC) device negative lead (L) is always white.
Multifunction Process Calibrator
Using Measure Mode
23
V
mA
MEASURE
SOURCE / MEASURE
30V MAX ALL TERMINALS
4W
3W
V
Hz
RTD
mA+
mA-
TC
COM COM
LOOP
Process Temperature
Warning
30 V maximum to
TC
TC Miniplug
bec12f.eps
Figure 10. Measuring Temperature with a Thermocouple
726
Users Manual
24
Using Resistance-Temperature Detectors (RTDs)
The Calibrator accepts RTD types shown in Table 6.
RTDs are characterized by their resistance at 0 °C
(32 °F), which is called the “ice point” or R0. The most
common R0 is 100 Ω. The Calibrator accepts RTD
measurement inputs in two-, three-, or four-wire
connections, with the three-wire connection the most
common. A four-wire configuration provides the highest
measurement precision, and two-wire provides the lowest
measurement precision.
To measure temperature using an RTD input:
1. If necessary, press M for MEASURE mode.
2. Press R for the RTD display. Continue pressing
this key to select the desired RTD type.
3. Press X or W to select a 2-, 3-, or 4- wire
connection.
4. Attach the RTD to input terminals as shown in
Figure 11.
PRT Custom Curves
Up to three custom curves can be named and CVD
coefficients can be entered through the serial port. Names
can be up to six characters. For more information, see
the Application Note on the 725/726 CD.
Multifunction Process Calibrator
Using Measure Mode
25
Table 6. RTD Types Accepted
RTD Type Ice Point (R0) Material α Range (°C)
Pt100 (3926) 100 Ω Platinum 0.003926 Ω/°C -200 to 630
Pt100 (385) 100 Ω Platinum 0.00385 Ω/°C -200 to 800
Ni120 (672) 120 Ω Nickel 0.00672 Ω/°C -80 to 260
Pt200 (385) 200 Ω Platinum 0.00385 Ω/°C -200 to 630
Pt500 (385) 500 Ω Platinum 0.00385 Ω/°C -200 to 630
Pt1000 (385) 1000 Ω Platinum 0.00385 Ω/°C -200 to 630
Pt100 (3916) 100 Ω Platinum 0.003916 Ω/°C -200 to 630
The IEC standard RTD commonly used in U.S. industrial applications is the Pt100 (385), α = 0.00385 Ω/°C.
Pt100 (3916), α = 0.003916 Ω/°C is also designated as JIS curve.
Custom RTDs may also be added, see PRT Custom Curves
726
Users Manual
26
RTD
RTD
RTD
2W
3W
4W
V
mA
MEASURE
SOURCE / MEASURE
30V MAX ALL TERMINALS
4W
3W
V
Hz
RTD
mA+
mA-
TC
COM COM
LOOP
V
mA
MEASURE
SOURCE / MEASURE
30V MAX ALL TERMINALS
4W
3W
V
Hz
RTD
mA+
mA-
TC
COM COM
LOOP
V
mA
MEASURE
SOURCE / MEASURE
30V MAX ALL TERMINALS
4W
3W
V
Hz
RTD
mA+
mA-
TC
COM COM
LOOP
bec15f.eps
Figure 11. Measuring Temperature with an RTD, Measuring 2-, 3-, and 4-Wire Resistance
Multifunction Process Calibrator
Using Measure Mode
27
Measuring Pressure
Many ranges and types of pressure modules are available
from Fluke, see “Accessories”. Before using a pressure
module, read its instruction sheet. The modules vary in
use, media, and accuracy.
Figure 12 shows the gage and differential modules.
Differential modules also work in gage mode by leaving
the low fitting open to atmosphere.
To measure pressure, attach the appropriate pressure
module for the process pressure to be tested, and
proceed as follows:
W Warning
To avoid a violent release of pressure in a
pressurized system, shut off the valve and
slowly bleed off the pressure before attaching
the pressure module to the pressure line.
Differential
HighLow
15 PSID/G
BURST PRESSURE 45 PSIG
PRESSURE MODULE
700
P
04
1 bar100 kPa
RANGE
Gage
RANGE
100 PSIG
BURST PRESSURE 300 PSIG
PRESSURE MODULE
700
P
06
7 bar700 kPa
gj11f.eps
Figure 12. Gage and Differential Pressure Modules
WCaution
To avoid mechanically damaging the
pressure module:
• Never apply more than 10 ft.-lb. (13.5 Nm)
of torque between the pressure module
fittings, or between the fittings and the
body of the module. Always apply
appropriate torque between the pressure
module fitting and connecting fittings or
adapters.
726
Users Manual
28
• Never apply pressure above the rated
maximum printed on the pressure
module.
• Only use the pressure module with
specified materials. Refer to the printing
on the pressure module or the pressure
module instruction sheet for the
acceptable material compatibility.
1. Connect a pressure module to the Calibrator as
shown in Figure 13. The threads on the pressure
modules accept standard ¼ NPT pipe fittings. Use
the supplied ¼ NPT to ¼ ISO adapter if necessary.
2. Press either A or a. The Calibrator
automatically senses which pressure module is
attached and sets its range accordingly.
3. Zero the pressure module as described in the
module’s Instruction Sheet. Modules vary in zeroing
procedures depending on module type, but all require
pressing A for 3 seconds.
Continue pressing A to change pressure display
units to psi, mmHg, inHg, cmH2O@4 °C, cmH2O@20
°C, inH2O@4 °C, inH2O@20 °C, inH2O@60 °F, mbar,
bar, kg/cm2, or kPa.
Zeroing with Absolute Pressure Modules
To zero, adjust the Calibrator to read a known pressure.
This can be barometric pressure, if it is accurately known,
for all but the 700PA3 module. The maximum range of
700PA3 is 5 psi; therefore the reference pressure must be
applied with a vacuum pump. An accurate pressure
standard can also apply a pressure within range for any
absolute pressure module. To adjust the Calibrator
reading, proceed as follows:
1. Press A, REF Adjust appears to the right of the
pressure reading.
2. Use X to increase or W to decrease the Calibrator
reading to equal the reference pressure.
3. Press A again to exit the zeroing procedure.
The Calibrator stores and automatically reuses the zero
offset correction for one absolute-pressure module so that
the module is not rezeroed every time you use it.
Multifunction Process Calibrator
Using Measure Mode
29
726
PRECISION CALIBRATOR
0%
25%
25%
SAVE
RECALL
Return to
Recall
FREQ
MEAS
SOURCE
ENTER
EXIT CONFIG
HART
TC
RTD PULSE
V mA
V mA
LOOP SWITCH
TEST
100%
%Error ZERO
3 Seconds
OPEN/CLOSE
TRIGGER/STOP
CONFIG
SELECTION
Differential
Module
Tank
HL
Isolation
Valve
Gage
Module
bec37f.eps
Figure 13. Connections for Measuring Pressure
726
Users Manual
30
Using Source Mode
In SOURCE mode, the Calibrator:
• generates calibrated signals for testing and
calibrating process instruments
• supplies voltages, currents, frequencies, and
resistances
• simulates the electrical output of RTD and
thermocouple temperature sensors
• measures gas pressure from an external source,
creating a calibrated pressure source.
Sourcing 4 to 20 mA
To select the current sourcing mode, proceed as follows:
1. Connect the test leads in the mA terminals (left
column).
2. If necessary, press M for SOURCE mode.
3. Press V for current and enter the desired current
by pressing X,W,Y, and Z.
Simulating a 4- to 20-mA Transmitter
Simulate is a special mode of operation in which the
Calibrator is connected into a loop in place of a
transmitter and supplies a known, settable test current.
Proceed as follows:
1. Connect the 24 V loop power source as shown in
Figure 14.
2. If necessary, press M for SOURCE mode.
3. Press V until both mA and SIM display.
4. Enter the desired current by pressing X,W,Y, and
Z.
Multifunction Process Calibrator
Using Source Mode
31
726
PRECISION CALIBRATOR
0%
25%
25%
SAVE
RECALL
Return to
Recall
FREQ
MEAS
SOURCE
ENTER
EXIT CONFIG
HART
TC RTD PULSE
V mA
V mA
LOOP SWITCH
TEST
100%
%Error ZERO
3 Seconds
OPEN/CLOSE
TRIGGER/STOP
CONFIG
SELECTION
Loop
Power
Supply
Readout or
Controller
+24 V
Black
Red
+
–
bec17f.eps
Figure 14. Connections for Simulating a 4- to 20-mA Transmitter
726
Users Manual
32
Sourcing Other Electrical Parameters
Volts, ohms, and frequency are also sourced and shown
in the lower display.
To select an electrical sourcing function, proceed as
follows:
1. Connect the test leads as shown in Figure 15,
depending on the source function.
2. If necessary, press Mfor SOURCE mode.
3. Press V for dc voltage, or K for frequency, and
R for resistance.
4. Enter the desired output value by pressing X and
W keys. Press Y and Z to select a different digit to
change.
Multifunction Process Calibrator
Using Source Mode
33
V
mA
MEASURE
SOURCE / MEASURE
30V MAX ALL TERMINALS
4W
3W
V
Hz
RTD
mA+
mA-
TC
COM COM
LOOP
V
mA
MEASURE
SOURCE / MEASURE
30V MAX ALL TERMINALS
4W
3W
V
Hz
RTD
mA+
mA-
TC
COM COM
LOOP
Red
Black
+
–
+
–
Red
Black Common
Common
V
mA
Hz
+ mA
HART
Communicator
bec16f.eps
Figure 15. Electrical Sourcing Connections
726
Users Manual
34
Simulating Thermocouples
Connect the Calibrator TC input/output to the instrument
under test with the thermocouple wire and the appropriate
thermocouple mini-connector (polarized thermocouple
plug with flat, in-line blades spaced 7.9 mm [0.312 in]
center to center).
One pin is wider than the other.
W Caution
Do not try to force a miniplug into the wrong
polarization.
Figure 16 shows this connection. Proceed as follows to
simulate a thermocouple:
1. Attach the thermocouple leads to the appropriate TC
miniplug, then to the TC input/output as shown in
Figure 16.
2. If necessary, press M for SOURCE mode.
3. Press T for the TC display. If desired, continue
pressing this key to select the desired thermocouple
type.
4. Enter the temperature you want by pressing X and
W keys. Press Y and Z to select a different digit to
edit.
Multifunction Process Calibrator
Using Source Mode
35
726
PRECISION CALIBRATOR
0%
25%
25%
SAVE
RECALL
Return to
Recall
FREQ
MEAS
SOURCE
ENTER
EXIT CONFIG
HART
TC
RTD PULSE
V mA
V mA
LOOP SWITCH
TEST
100%
%Error ZERO
3 Seconds
OPEN/CLOSE
TRIGGER/STOP
CONFIG
SELECTION
TEST DC PWR
++–
–+
Color depends
on type of TC
TC Miniplug
bec20f.eps
Figure 16. Connections for Simulating a Thermocouple
726
Users Manual
36
Simulating RTDs
Connect the Calibrator to the instrument under test as
shown in Figure 17. Proceed as follows to simulate an
RTD:
1. If necessary, press M for SOURCE mode.
2. Press R for the RTD display.
Note
Use the 3W and 4W terminals for measurement
only, not for simulation. The Calibrator simulates
a 2-wire RTD at its front panel. To connect to a
3-wire or 4-wire transmitter, use the stacking
cables to provide the extra wires. See Figure 17.
3. Enter the desired temperature by pressing X and
W. Press Y and Z to select a different digit to edit.
4. If the 726 display indicates ExI HI, the excitation
current from your device under test exceeds the
limits of the 726.
Multifunction Process Calibrator
Using Source Mode
37
100%
25%
25%
MEAS
SOURCE
0%
726
PRECISION CALIBRATOR
SAVE
RECALL
FREQ
ENTER
EXIT CONFIG
HART
TC
RTD PULSE
V mA
V mA
LOOPSWITCH
TEST
%Error ZERO
3 Seconds
OPEN/CLOSE
TRIGGER/STOP
CONFIG
SELECTION
Return to
Recall
SENSOR
TERMINALS
BLACK
RED
1
2
3
4
bec40f.eps
Figure 17. Connections for Simulating 3- and 4-Wire RTD
726
Users Manual
38
Sourcing Pressure
The Calibrator sources pressure by measuring pressure
supplied by a pump or other sources, and displaying the
pressure in the SOURCE field. Figure 18 shows how to
connect a pump to a Fluke pressure module which makes
it a calibrated source.
Many ranges and types of pressure modules are available
from Fluke, see “Accessories”. Before using a pressure
module, read its instruction sheet. The modules vary in
use, media, and accuracy.
Attach the appropriate pressure module for the process
pressure to be tested.
Proceed as follows to source pressure:
WWarning
To avoid a violent release of pressure in a
pressurized system, shut off the valve and
slowly bleed off the pressure before attaching
the pressure module to the pressure line.
WCaution
To avoid mechanically damaging the
pressure module:
• Never apply more than 10 ft.-lb. (13.5 Nm)
of torque between the pressure module
fittings, or between the fittings and the
body of the module. Always apply
appropriate torque between the pressure
module fitting and connecting fittings or
adapters.
• Never apply pressure above the rated
maximum printed on the pressure
module.
• Use the pressure module only with
specified materials. Refer to the printing
on the pressure module or the pressure
module instruction sheet for the
acceptable material compatibility.
Multifunction Process Calibrator
Using Source Mode
39
1. Connect a pressure module to the Calibrator as
shown in Figure 18. The threads on the pressure
modules accept standard ¼ NPT pipe fittings. Use
the supplied ¼ NPT to ¼ ISO adapter if necessary.
2. Press U (lower display). The Calibrator
automatically senses which pressure module is
attached and sets its range accordingly.
3. Zero the pressure module as described in the
module’s Instruction Sheet. Modules vary in zeroing
procedures depending on module type.
4. Pressurize the pressure line with the pressure
source to the desired level as shown on the display.
If desired, continue pressing U to change
pressure display units to psi, mmHg, inHg,
cmH2O@4 °C, cmH2O@20 °C, inH2O@4 °C,
inH2O@20 °C, inH2O@60 °C, mbar, bar, kg/cm2, or
kPa.
726
Users Manual
40
726
PRECISION CALIBRATOR
0%
25%
25%
SAVE
RECALL
Return to
Recall
FREQ
MEAS
SOURCE
ENTER
EXIT CONFIG
HART
TC
RTD PULSE
V mA
V mA
LOOP SWITCH
TEST
100%
%Error ZERO
3 Seconds
OPEN/CLOSE
TRIGGER/STOP
CONFIG
SELECTION
Hand Pump
Pressure
Module
Measure mA
Source Pressure
24 V Loop Power
Enabled
0%
To Unit Under Test
bec47f.eps
Figure 18. Connections for Sourcing Pressure
Multifunction Process Calibrator
Setting 0 % and 100 % Output Parameters
41
Setting 0 % and 100 % Output
Parameters
For current output, the Calibrator assumes that 0 %
corresponds to 4 mA and 100 % corresponds to 20 mA.
For other output parameters, 0 % and 100 % points must
be set before using the step and ramp functions. Proceed
as follows:
1. If necessary, press M for SOURCE mode.
2. Select the desired source function and use the arrow
keys to enter the value. This example is temperature
source using 100 °C and 300 °C values for source.
3. Enter 100 °C then press and hold J to store the
value.
4. Enter 300 °C then press and hold G to store the
value.
This setting can now be used for the following:
• Manually stepping an output in 25 %
increments.
• Switch between the 0 and 100 % span points by
momentarily pushing J or G.
% Error Functionality
Percentage Error is available for every range on the
lower display. The calculation is based on a mA
percentage deviation from the value measured on the
upper display to the value sourced on the lower display
0 % mA and 100 % mA are fixed to 4 and 20 mA. 0 %
and 100 % for the lower display are set in source using
J and G, refer to “Setting 0% and 100% Output
Parameters”.
Stepping and Ramping the Output
Two additional features are available for adjusting the
value of source functions:
• Stepping the output manually with the H and I
keys, or in automatic mode
• Ramping the output
Stepping and ramping apply to all functions except
pressure, which requires use of an external pressure
source.
726
Users Manual
42
Manually Stepping the mA Output
To manually step current output:
• Use H or I to step the current up or down in
25 % steps.
• Touch either J to go to 0 %, or G to go to
100 %.
Auto Ramping the Output
Auto ramping can continuously apply a varying stimulus
from the Calibrator to a transmitter, while your hands
remain free to test the response of the transmitter.
When L is pressed, the Calibrator produces a
repeating 0 % - 100 % - 0 % ramp in a choice of three
ramp waveforms:
• E 0 % - 100 % - 0 % 40-second smooth ramp
• P 0 % - 100 % - 0 % 15-second smooth ramp
• N 0 % - 100 % - 0 % Stair-step ramp in 25 %
steps, pausing 5 seconds at each step. Steps are
listed in Table 7.
To exit ramping, press any button.
Table 7. mA Step Values
Step 4 to 20 mA
0 % 4.000
25 % 8.000
50 % 12.000
75 % 16.000
100 % 20.000
Storing and Recalling Setups
Up to eight settings can be stored in a nonvolatile
memory to recall for later use. A low battery condition or
a battery change does not jeopardize the stored settings.
Store a Setup
To store a setup:
1. Create the desired setup.
2. Push S. The right side of the display changes to
show SAVE SETUP and SAVE DATA.
3. Push Sto select SAVE SETUP.
4. Push Y or Z to select the desired memory location (at
the top of the LCD).
5. Push S to enter the setup.
Multifunction Process Calibrator
Storing and Recalling Data
43
Recall a Setup
To recall a setup:
1. Push S twice. The right side of the display
changes to show RECL SETUP and RECALL DATA.
2. Push S again to RECL SETUP.
3. Push Z to select the desired memory location (at the
top of the LCD).
4. Push S to recall the setup from the proper
memory location.
Storing and Recalling Data
Up to 40 data samples can be stored in a nonvolatile
memory to be recalled for later use. A low battery
condition or a battery change does not jeopardize the
stored settings.
Storing Data
To store measurement data, use the following procedure,
refer to Figure 19.
1. Take the desired measurement.
2. Push S. The right side of the display changes to
show SAVE SETUP and SAVE DATA.
3. Press W to select SAVE DATA.
4. Push S again. The open data point (bottom right
of the display) flashes.
5. Use Y and Z to change the data point location (1-8).
6. Push S to store the measurement and return the
unit to the measurement mode. Figure 19 shows a
reading stored in memory location 3, data point 1.
726
Users Manual
44
Memory Locations
Data Point
1
S A V E
D A T A
Save Data Mode Indicator
bec46f.eps
Figure 19. SAVE DATA Menu Showing Measurement
Memory Location 3, 1
Recall Data
To recall data:
1. Push S twice. The right side of the display
changes to show RECL SETUP and RECALL DATA.
2. Push W to highlight RECL DATA (bottom right of the
display).
3. Push S.
4. Push Z to choose the desired memory location (top
of the display).
The data saved in that first memory location now
appears. There can be different measurements
stored (1-5) for each memory location (1-8).
5. Push Y or Z to select the correct data location
(bottom right of display).
6. Push S to recall the data stored in that location.
7. Push W to return to the same RECALL DATA
location to see the next saved measurement, 2 of 5
for example.
Pulse Train Source/Read
Pulse Train Source/Read counts input pulses or sources
output pulses. Use the configuration menus to set the
frequency and output voltage. Refer to “Configuration
Menus” earlier in this manual. The number of counts is
set through the main display and cannot be changed
while sourcing pulses. L works as a trigger/stop key
in this mode since ramping or stepping during a pulse
train is not relevant.
Multifunction Process Calibrator
Calibrating a Transmitter
45
Calibrating a Transmitter
Use the measurement (upper display) and source (lower
display) modes to calibrate a transmitter. This section
applies to all but pressure transmitters. The following
example shows how to calibrate a temperature
transmitter. Use the following steps to calibrate a
transmitter:
1. Connect the Calibrator to the instrument under test
as shown in Figure 20.
2. Press l for current (upper display). If required,
press l again to activate loop power.
3. Press T (lower display). If desired, continue
pressing this key to select the desired thermocouple
type.
4. If necessary, press M for SOURCE mode.
5. Set the zero and span parameters by pressing X
and W. Enter these parameters by pressing and
holding J and G. For more information on
setting parameters, see “Setting 0 % and 100 %
Output Parameters”.
6. Perform test checks at 0-25-50-75-100 % points by
pressing H or I. Adjust the transmitter as
necessary.
Note
When HART resistor mode is selected, the
250
Ω
resistor is turned on both mA channels.
726
Users Manual
46
726
PRECISION CALIBRATOR
0%
25%
25%
SAVE
RECALL
Return to
Recall
FREQ
MEAS
SOURCE
ENTER
EXIT CONFIG
HART
TC
RTD PULSE
V mA
V mA
LOOP SWITCH
TEST
100%
%Error ZERO
3 Seconds
OPEN/CLOSE
TRIGGER/STOP
CONFIG
SELECTION
Red
TEST DC PWR
+–+–
–+
Black
HART
Communicator
bec44f.eps
Figure 20. Calibrating a Thermocouple Transmitter
Multifunction Process Calibrator
Calibrating a Pressure Transmitter
47
Calibrating a Pressure Transmitter
The following steps explain calibrating a pressure
transmitter.
1. Connect the Calibrator to the instrument under test
as shown in Figure 21.
2. Press l for current (upper display). If required,
press l again to activate loop power.
3. Press U (lower display).
4. If necessary, press M for SOURCE mode.
5. Zero the pressure module.
6. Perform checks at 0 % and 100 % of span and
adjust the transmitter as necessary.
Note
When HART resistor mode is selected, the
250
Ω
resistor is turned on both mA channels.
726
Users Manual
48
726
PRECISION CALIBRATOR
0%
25%
25%
SAVE
RECALL
Return to
Recall
FREQ
MEAS
SOURCE
ENTER
EXIT CONFIG
HART
TC
RTD PULSE
V mA
V mA
LOOP SWITCH
TEST
100%
%Error ZERO
3 Seconds
OPEN/CLOSE
TRIGGER/STOP
CONFIG
SELECTION
Hand Pump
SIGNAL
TEST
+–
Pressure
Module
Red
Black
Measure mA
Source Pressure
24 V Loop Power
Enabled
0%
HART
Communicator
bec34f.eps
Figure 21. Calibrating a Pressure-to-Current (P/I) Transmitter
Multifunction Process Calibrator
Calibrating an I/P Device
49
Calibrating an I/P Device
The following steps explain how to calibrate a device that
controls pressure. Proceed as follows:
1. Connect the test leads to the instrument under test as
shown in Figure 22. The connections simulate a
current-to-pressure transmitter and measures the
corresponding output pressure.
2. Press A (upper display).
3. Press V for sourcing current (lower display).
4. If necessary, press M for SOURCE mode.
5. Enter the desired current by pressing X and W.
Press Y and Z to select different digits.
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726
PRECISION CALIBRATOR
0%
25%
25%
SAVE
RECALL
Return to
Recall
FREQ
MEAS
SOURCE
ENTER
EXIT CONFIG
HART
TC
RTD PULSE
V mA
V mA
LOOP SWITCH
TEST
100%
%Error ZERO
3 Seconds
OPEN/CLOSE
TRIGGER/STOP
CONFIG
SELECTION
SIGNAL
TEST
+–
Red
Black
Measure
Pressure
Source mA
Pressure
Module
0%
HART
Communicator
bec28f.eps
Figure 22. Calibrating a Current-to-Pressure (I/P) Transmitter
Pressure Switch Test
51
Pressure Switch Test
Note
This example uses a normally-closed switch.
The procedure is the same for an open switch
but the display reads OPEN instead of CLOSE.
To perform a switch test:
1. Connect the Calibrator mA and COM terminals to the
switch using the pressure switch terminals and
connect the pump to the pressure switch. The
polarity of the terminals does not matter.
2. Make sure the vent on the pump is open and, if
necessary, zero the Calibrator. Close the vent after
zeroing the Calibrator.
3. Press Q to enter switch-test mode. The upper
display indicates the applied pressure. CLOSE is
displayed to the right of the pressure reading to
indicate closed contacts.
4. Slowly apply pressure with the pump until the switch
opens.
Note
Pressure the device slowly to ensure accurate
readings. Run the test several times to confirm
repeatability.
OPEN displays once the switch is open. Slowly bleed the
pump until the pressure switch closes. RECALL appears
on the display.
5. Press Q to read the pressure values for when the
switch opened, for when it closed, and for the
deadband.
6. Hold Q for three seconds to restart the test. Press
A OR U to exit the switch test.
Testing an Output Device
Use the source functions to test and calibrate actuators,
recording, and indicating devices. Proceed as follows:
1. Connect the test leads to the instrument under test
as shown in Figure 23.
2. Press V for current or dc voltage, or K for
frequency or resistance (lower display).
3. If necessary, press M for SOURCE mode.
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bec25f.eps
Figure 23. Calibrating a Chart Recorder
Remote Control Commands
The Calibrator may be remotely controlled from a PC
running a terminal emulator program. The remote control
commands give access to all capabilities of the Calibrator
with the exception of pressure measurement.
See the Fluke Web Site for the 726 Remote
Programming application note at
www.fluke.com/processtools
HART
Functionality
The Calibrator has a user-selectable 250 Ω HART to
facilitate use with HART communication devices. The
resistor can be switched in or out using config selection
menus. Use a HART communicator when measuring mA
with loop power or sourcing mA.
Maintenance
53
Maintenance
Replacing the Batteries
XWWarning
To avoid false readings, which could lead to
possible electric shock or personal injury,
replace the batteries as soon as the battery
indicator (M) appears.
Figure 24 shows you how to replace the batteries.
Battery and
Compartment
bec38f.eps
Figure 24. Replacing the Batteries
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Cleaning the Calibrator
WCaution
To avoid damaging the plastic lens and case,
do not use solvents or abrasive cleansers.
Clean the Calibrator and pressure modules with a soft
cloth dampened with water or water and mild soap.
Service Center Calibration or Repair
Calibration, repairs, or servicing not covered in this
manual should be performed only by qualified service
personnel. If the Calibrator fails, check the batteries first,
and replace them if needed.
To locate an authorized service center, refer to
“Contacting Fluke” at the beginning of the manual.
Replacement Parts
Table 8 lists the part number of each replaceable part.
Refer to Figure 25.
Table 8. Replacement Parts
Item Description PN Qty.
1 AA alkaline batteries 376756 4
2 Case screws 832246 4
3 Battery door 664250 1
4 Accessory mount 658424 1
5 Tilt stand 659026 1
6 Battery door 1/4-turn
fasteners
948609 2
7 TL75 series test leads
855742 1
8 Test lead, red
Test lead, black
688051
688066
1
1
9
726 Product Overview
Manual
2441588 1
10 AC72 alligator clip, red
AC72 alligator clip, black
1670641
1670652
1
1
11
725/726 CD ROM
,
contains User Manual
1549615 1
Maintenance
55
9
3
8
10
7
1
4
5
11
2
6
bec45f.eps
Figure 25. Replacement Parts
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Accessories
For more information about these accessories, contact
your Fluke representative. Fluke Pressure Module
Compatibility is listed in Table 9. Pressure Modules and
Fluke model numbers are listed in Table 10. Contact your
Fluke representative about new pressure modules not
listed here.
• 700HTP 0 to 10,000 PSI Pump
• 700PTP -11.6 to 360 PSI Pump
• 700TC1 and 700TC2 Thermocouple Mini-plug Kits
External Fluke Pressure Module Compatibility
The output of Fluke 700P pressure modules can cause
the 726’s 5 digit display to overflow, or else produce
values that are too low to be read if inappropriate units
are selected. This is prevented by displaying OL on the
display per the following table.
Table 9. Fluke Pressure Module Compatibility
Pressure Unit Module Compatibility
Psi Available on all pressure ranges
In. H20 All ranges through 3000 psi
cm. H20 All ranges through 1000 psi
Bar 15 psi and above
Mbar All ranges through 1000 psi
KPa Available on all pressure ranges
In.Hg. Available on all pressure ranges
mm. Hg All ranges through 1000 psi
Kg/cm2 15 psi and above
Accessories
57
Table 10. Pressure Modules
Fluke Model Number Range Type and Media
Fluke-700P00 0 to 1” H2O differential, dry
Fluke-700P01 0 to 10” H2O differential, dry
Fluke-700P02 0 to 1 psi differential, dry
Fluke-700P22 0 to 1 psi differential, wet
Fluke-700P03 0 to 5 psi differential, dry
Fluke-700P23 0 to 5 psi differential, wet
Fluke-700P04 0 to 15 psi differential, dry
Fluke-700P24 0 to 15 psi differential, wet
Fluke-700P05 0 to 30 psi gage, wet
Fluke-700P06 0 to 100 psi gage, wet
Fluke-700P27 0 to 300 psi gage, wet
Fluke-700P07 0 to 500 psi gage, wet
Fluke-700P08 0 to 1,000 psi gage, wet
Fluke-700P09 0 to 1,500 psi gage, wet
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Table 10. Pressure Modules (cont.)
Fluke Model Number Range Type and Media
Fluke-700P29 0 to 3,000 psi gage, wet
Fluke-700P30 0 to 5,000 psi gage, wet
Fluke-700P31 0 to 10,000 psi gage, wet
Fluke-700PA3 0 to 5 psi absolute, wet
Fluke-700PA4 0 to 15 psi absolute, wet
Fluke-700PA5 0 to 30 psi absolute, wet
Fluke-700PA6 0 to 100 psi absolute, wet
Fluke-700PV3 0 to -5 psi vacuum, dry
Fluke-700PV4 0 to -15 psi vacuum, dry
Fluke-700PD2 ±1 psi dual range, dry
Fluke-700PD3 ±5 psi dual range, dry
Fluke-700PD4 ±15 psi dual range, dry
Fluke-700PD5 −15/+30 psi dual range, wet
Fluke-700PD6 −15/+100 psi dual range, wet
Fluke-700PD7 −15/+200 psi dual range, wet
Specifications
59
Specifications
Specifications are based on a one year calibration cycle and apply from +18 °C to +28 °C unless stated otherwise. All
specifications assume a five-minute warmup period.
DC Voltage Measurement and Source
Range Minimum Maximum Accuracy,
(% of Reading + Floor)
30 V (upper display) 0.000 30.000 0.010 % + 2 mV
20 V (lower display) 0.000 20.000 0.010 % + 2 mV
20 V (Source) 0.000 20.000 0.010 % + 2 mV
100 mV (Source) 0.000 100.000 0.010 % + 10 µV
90 mV (Read) 0.000 90.000 0.010 % + 10 µV
Maximum current output in voltage ranges is 1 mA with an output impedance of ≤ 1 Ω
DC mA Measurement and Source
Range Minimum Maximum Accuracy,
(% of Reading + Floor)
mA Read (Upper Display) 0.000 24.000 0.010 % + 2 µA
mA Read (Lower Display) 0.000 24.000 0.010 % + 2 µA
mA Source 0.000 24.000 0.010 % + 2 µA
Maximum load on, mA source is 1 ke. With the HART resistor on, maximum load is 750 Ω.
Voltage input range on simulate mode is 5 to 30 V
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Ohms Measurement
Ohms Range Minimum Maximum Accuracy
(% of Reading + Floor)
Ohms Read (low) 0.00 400.00 0.015 % + 0.05 Ω
Ohms Read (high) 401.0 4000.0 0.015 % + 0.5 Ω
Ohms Source
Ohms Range Minimum Maximum Excitation Current from
Measurement Device
Accuracy
(% of Reading + Floor)
5.0 400.0 0.1 to 0.5 mA 0.015 % + 0.1 Ω
Ohms Source (low)
5.0 400.0 0.5 to 3 mA 0.015 % + 0.05 Ω
400 1500 0.05 to 0.8 mA 0.015 % + 0.5 Ω
Ohms Source (high)
1500 4000 0.05 to 0.4 mA 0.015 % + 0.5 Ω
Unit is compatible with smart transmitters and PLCs.
Frequency response is ≤ 5 mS
Frequency Measurement
Range Minimum Maximum
Accuracy
(% of Reading + Floor)
CPM Read 2.0 1000.0 0.05 % + 0.1 CPM
Hz Read 1.0 1000.0 0.05 % + 0.1 Hz
KHz Read 1.00 15.00 0.05 % + 0.01 KHz
Specifications
61
Frequency Source
Range Minimum Maximum Accuracy
CPM Source 2.0 1000 0.05 %
Hz Source 1.0 1000.0 0.05 %
1.0 10.00 0.25 % KHz Source
10.00 15.00 0.50 %
Temperature, Thermocouples
Type Minimum Maximum CJC ON
Accuracy
CJC OFF
Accuracy
-210 0.0 0.6 0.4
0.0 800 0.4 0.2
J
800 1200 0.5 0.3
-200 0.0 0.8 0.6
0.0 1000 0.5 0.3
K
1000 1372 0.7 0.5
-250 0.0 0.8 0.6
T 0.0 400 0.4 0.2
-250 -100 0.8 0.6
E -100 1000 0.4 0.4
-20 0.0 2.0 1.8
R 0.0 1767 1.4 1.2
CJC error outside of 23 ± 5 °C is 0.05 °C / °C
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Type Minimum Maximum
CJC ON
Accuracy
CJC OFF
Accuracy
-20 0.0 2.0 1.8
S 0.0 1767 1.4 1.2
600 800 1.4 1.2
800 1000 1.5 1.3
B
1000 1820 1.7 1.5
0.0 1000 0.8 0.6
C 1000 2316 2.5 2.3
-200 0.0 0.45 0.25
L 0.0 900 0.4 0.2
-200 0.0 0.7 0.5
U 0.0 600 0.45 0.25
-200 0.0 1.0 0.8
N 0.0 1300 0.6 0.4
XK -200 800 0.4 0.2
0.0 800 1.1 0.9
BP 800 2500 2.3 2.1
Range Accuracy
Thermocouple in mV read -10 °C to 75 °C 0.015 % + 10 µV
(% of Reading + Floor)
Thermocouple in mV source -10 °C to 75 °C 0.015 % + 10 µV
(% of Reading + Floor)
Maximum current output in voltage ranges is 1 mA with an output impedance of ≤ 1 e
Specifications
63
RTD Accuracy (Read and Source) (ITS-90)
Range Minimum Maximum Accuracy
Ni120 (672) -80.00 260.00 0.15
-200.00 100.00 0.15
100.00 300.00 0.25
300.00 600.00 0.35
Pt100 (385)
600.00 800.00 0.45
-200.00 100.00 0.15
100.00 300.00 0.25
Pt100 (3926)
300.00 630.00 0.35
-200.00 100.00 0.15
100.00 300.00 0.25
Pt100 (3916)
300.00 630.00 0.35
-200.00 100.00 0.75
100.00 300.00 0.85
Pt200 (385)
300.00 630.00 0.95
-200.00 100.00 0.35
100.00 300.00 0.45
Pt500 (385)
300.00 630.00 0.55
-200.00 100.00 0.15
100.00 300.00 0.25
Pt1000 (385)
300.00 630.00 0.35
CU10 -10.00 250.00 1.8
Notes: Read Accuracy is based on 4-wire input. For 3-wire input, add ± 0.05 e assuming all three RTD leads are matched.
Source Accuracy is based on 0.5 to 3.0 mA excitation current (0.1 mA for pt1000 range)
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Loop Power Supply
Voltage: 24 V
Maximum current: 22 mA
Short circuit protected.
Pulse Read and Pulse Source
Pulse Min Max Accuracy Frequency
Source 10,000
Read
1
100,000
1 Count 2 CPM to 10 kHz
Pressure Measurement
Range Resolution Accuracy Units Mode
Determined by
pressure module
5 digits Determined by
pressure module
psi, inH2O@4 °C, inH2O@20 °C, kPa,
cm H2O@4 °C, cmH2O@20 °C, bar,
mbar, kg/cm2, mmHg, inHg
Pushing A for 3 seconds
stores present pressure value
as an offset and subtracts it
from the displayed value
Specifications
65
General Specifications
Operating temperature -10 °C to 50 °C
Storage temperature - 20 °C to 70 °C
Stability ± 0.005 % of range/°C outside of 23 ± 5 °C
Operating altitude 3000 meters above mean sea level
Relative Humidity (% RH operating without condensation) 90 % (10 to 30 °C)
75 % (30 to 40 °C)
45 % (40 to 50 °C)
35 % (50 to 55 °C)
uncontrolled < 10 °C
Vibration Random, 2 g, 5 to 500 Hz
Safety EN50082-1:1992 and EN55022: 1994 Class B Criteria A or B CSA
C22.2 No 1010.1:1992
Power requirements 4 AA alkaline batteries
Protection Class Pollution Degree II
Size 96 x 200 x 47 mm. (3.75 x 7.9 x 1.86 in)
Weight 650 gm (1 lb, 7 oz)
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67
Index
—0—
0% output parameter, setting, 41
—1—
100% output parameter, setting, 41
—4—
4 to 20 mA transmitter
simulating, 30
—A—
Accessories, 56
Auto ramping output, 42
—B—
Battery, replacing, 53
—C—
Calibration, 54
Celcius and Fahrenheit, 15
Cleaning calibrator, 54
Cold Junction Compensation (CJC), 15
Commands
Remote Control, 52
configuration menus, 14
Connections
for pressure sourcing, 39
Contact Information, 1
—D—
Data
Recall, 44
display
contrast adjustment, 14
Display, 13
—E—
Electrical parameters
measurement, 20
sourcing, 32
—F—
frequency output voltage, 15
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—G—
Getting started, 16
—H—
HART
configuration menu, 16
—I—
I/P device, calibrating, 49
Input terminals, 8
Input/output terminals and connectors
(table), 9
—K—
Key functions (table), 11
Keys, 10
—L—
loop power, 18
Loop power
simulating, 30
—M—
Measure functions, summary (table), 2
Measure mode, 18
Measuring
pressure, 27
temperature with RTDs, 24
temperature with thermocouples, 21
menus
configuration, 14
—O—
Output device, testing, 51
Output terminals, 8
—P—
Parts list, 54
Percentage Error, 41
Pressure
Measurement, 27
Sourcing, 38
pressure modules
compatibility, 56
Pressure Modules
Compatibility, 56
Pressure modules available, 56
Pressure modules, zeroing, 28
Pressure Switch Test, 51
Pressure transmitter, calibrating, 47
Pulse Train Source/Read, 44
—R—
ramping, 41
Recalling setups, 42, 43
Remote control commands, 52
Repair, 54
Resistance-Temperature Detectors
accepted types (table), 25
RTD
simulating, 36
RTD
measuring, 24
types, 24
—S—
Safety information, 3
Saving
Measurements, 43
Servicing, 54
Setup
Recall, 43
recalling, 42, 43
Index
(continued)
69
storing, 42, 43
shut down mode, 15
Thermocouple, 34
Simulating
loop power, 30
RTD, 36
thermocouples, 34
Source functions, summary (table), 2
Source mode, 30
Sourcing
4 to 20 mA, 30
electrical parameters, 32
pressure, 38
thermocouples, 34
Specifications, 59
Standard equipment, 3
stepping, 41
Stepping output, 42
Storing setups, 42, 43
symbols, 7
—T—
Temperature
measuring with RTD, 24
measuring with thermocouple, 21
Terminals
input, 8
output, 8
Thermocouple
measuring, 21
measuring temperature, 21
sourcing, 34
types, 21
thermocouples
accepted types, 22
Transmitter
4 to 20 mA, simulating, 30
Transmitter, calibrating, 45
—V—
voltage to voltage test, 16
—Z—
Zeroing pressure modules, 28
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