Fluke 725 Users Manual

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®
725
Multifunction Process Calibrator
Users Manual
October, 1998 Rev.3, 5/04
© 1998-2004 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
Getting Acquainted with the Calibrator .......................................................................... 8
Input and Output Terminals ...................................................................................... 8
Keys.......................................................................................................................... 10
Display ...................................................................................................................... 13
Getting Started .............................................................................................................. 14
Shut Down Mode ........................................................................................................... 14
Contrast Adjustment ...................................................................................................... 16
Using Measure Mode..................................................................................................... 17
Measuring Electrical Parameters (Upper Display) .................................................... 17
Current Measurement with Loop Power.................................................................... 17
Measuring Electrical Parameters (Lower Display) .................................................... 19
Measuring Temperature............................................................................................ 20
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Using Thermocouples........................................................................................... 20
Using Resistance-Temperature Detectors (RTDs) ............................................... 23
Measuring Pressure .................................................................................................. 26
Zeroing with Absolute Pressure Modules.................................................................. 27
Using Source Mode........................................................................................................ 29
Sourcing 4 to 20 mA.................................................................................................. 29
Simulating a 4- to 20-mA Transmitter........................................................................ 29
Sourcing Other Electrical Parameters ....................................................................... 29
Simulating Thermocouples........................................................................................ 32
Simulating RTDs........................................................................................................ 32
Sourcing Pressure..................................................................................................... 35
Setting 0 % and 100 % Output Parameters ................................................................... 37
Stepping and Ramping the Output................................................................................. 37
Manually Stepping the mA Output............................................................................. 37
Auto Ramping the Output.......................................................................................... 38
Storing and Recalling Setups......................................................................................... 38
Calibrating a Transmitter................................................................................................ 39
Calibrating a Pressure Transmitter................................................................................. 41
Calibrating an I/P Device................................................................................................ 43
Testing an Output Device............................................................................................... 45
Remote Control Commands........................................................................................... 46
Replacing the Batteries.................................................................................................. 49
Replacing the Fuses ...................................................................................................... 49
Maintenance................................................................................................................... 50
Cleaning the Calibrator.............................................................................................. 50
Service Center Calibration or Repair......................................................................... 50
Replacement Parts.................................................................................................... 51
Accessories.................................................................................................................... 53
Contents (continued)
iii
External Fluke Pressure Module Compatibility ......................................................... 53
Specifications................................................................................................................. 56
DC Voltage Measurement......................................................................................... 56
DC Voltage Source ................................................................................................... 56
Millivolt Measurement and Source*........................................................................... 56
DC mA Measurement and Source ............................................................................ 57
Ohms Measurement.................................................................................................. 57
Ohms Source ............................................................................................................ 57
Frequency Measurement .......................................................................................... 57
Frequency Source..................................................................................................... 58
Temperature, Thermocouples................................................................................... 58
Loop Power Supply................................................................................................... 59
RTD Excitation (simulation) ...................................................................................... 59
Temperature, RTD Ranges, and Accuracies (ITS-90).............................................. 59
Pressure Measurement............................................................................................. 60
General Specifications.............................................................................................. 60
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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 ............................................................................................ 21
6. RTD Types Accepted............................................................................................................24
7. mA Step Values.................................................................................................................... 38
8A. Remote Control Upper Display ............................................................................................. 46
8B. Remote Control Lower Display ............................................................................................. 46
8C. "S" Commands Select Sensor Type ..................................................................................... 48
9. Replacement Parts ............................................................................................................... 51
10. Fluke Pressure Module Compatibility ................................................................................... 53
11. Pressure Modules................................................................................................................. 54
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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. Voltage-to-Voltage Test........................................................................................................ 15
6. Adjusting the Contrast .......................................................................................................... 16
7. Measuring Voltage and Current Output ................................................................................ 17
8. Connections for Supplying Loop Power................................................................................ 18
9. Measuring Electrical Parameters.......................................................................................... 19
10. Measuring Temperature with a Thermocouple ..................................................................... 22
11. Measuring Temperature with an RTD, Measuring 2-, 3-, and 4-Wire Resistance ................ 25
12. Gage and Differential Pressure Modules.............................................................................. 26
13. Connections for Measuring Pressure.................................................................................... 28
14. Connections for Simulating a 4- to 20-mA Transmitter......................................................... 30
15. Electrical Sourcing Connections ........................................................................................... 31
16. Connections for Simulating a Thermocouple........................................................................ 33
17. Connection for Simulating a 3-Wire RTD.............................................................................. 34
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18. Connections for Sourcing Pressure....................................................................................... 36
19. Calibrating a Thermocouple Transmitter ............................................................................... 40
20. Calibrating a Pressure-to-Current (P/I) Transmitter............................................................... 42
21. Calibrating a Current-to-Pressure (I/P) Transmitter............................................................... 44
22. Calibrating a Chart Recorder.................................................................................................45
23. Replacing the Battteries ........................................................................................................ 50
24. Replacement Parts................................................................................................................ 52
1
Multifunction Process Calibrator
Introduction
Your Fluke 725 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 has
the following features and functions:
• A split-screen display. The upper display allows you
to measure volts, current, and pressure only. The
lower display allows you to measure and source
volts, current, pressure, resistance temperature
detectors, thermocouples, frequency, and ohms.
• Calibrates a transmitter using the split-screen.
• A thermocouple (TC) input/output terminal and
internal isothermal block with automatic reference-
junction temperature compensation.
• Stores and recalls setups.
• Manual stepping and automatic stepping and
ramping.
• Controls the calibrator remotely from a PC running a
terminal emulator program.
Contacting Fluke
To order accessories, receive operating assistance, or
get the location of the nearest Fluke distributor or Service
Center, call:
USA: 1-888-99-FLUKE (1-888-993-5853)
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
Or, visit Fluke's Web site at www.fluke.com.
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Table 1. Summary of Source and Measure Functions
Function Measure Source
dc V 0 V to 30 V 0 V to 10 V
dc mA 0 to 24 mA 0 to 24 mA
Frequency 1 CPM to 10 kHz 1 CPM to 10 kHz
Resistance 0 Ω to 3200 Ω15 Ω to 3200 Ω
Thermocouple Types E, J, K, T, B, R, S, L, U, N, mV
RTD
(Resistance-
Temperature
Detector)
Pt100 Ω (385)
Pt100 Ω (3926)
Pt100 Ω (3916)
Pt200 Ω (385)
Pt500 Ω (385)
Pt1000 Ω (385)
Ni120
Pressure 27 modules ranging from 10 in. H2O to
10,000 psi
27 modules ranging from 10 in. H2O to
10,000 psi using an external pressure source
(hand pump)
Other functions Loop supply, Step, Ramp, Memory, Dual display
Standard Equipment
3
Standard Equipment
The items listed below and shown in Figure 1 are included
with your calibrator. If the calibrator is damaged or
something is missing, contact the place of purchase
immediately. To order replacement parts or spares, see
the user-replaceable parts list in Table 9.
• TL75 test leads (one set)
• AC70A alligator clips (one set)
• Stackable alligator clip test leads (one set)
• 725 Product Overview Manual
• 725 CD-ROM (contains Users Manual)
• Spare fuse
Safety Information
The calibrator is designed in accordance with IEC1010-1,
ANSI/ISA S82.01-1994 and CAN/CSA C22.2 No. 1010.1-
92. 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.
International symbols used on the calibrator and in this
manual are explained in Table 2.
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W Warning
To avoid possible electric shock or personal injury:
• 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.
• 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 you use 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 your measurement.
• Make sure the battery door is closed and latched before you operate the calibrator.
• Remove test leads from the calibrator before you open the battery door.
• Inspect the test leads for damaged insulation or exposed metal. Check test leads continuity. Replace
damaged test leads before you use the calibrator.
• When using the probes, keep your fingers away from the probe contacts. Keep your fingers behind the
finger guards on the probes.
• Connect the common test lead before you connect the live test lead. When you disconnect 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.
Safety Information
5
W Warning
• When using a pressure module, make sure the process pressure line is shut off and depressurized
before you connect it or disconnect 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.
Caution
To avoid possible damage to calibrator or to equipment under test:
• Disconnect the power and discharge all high-voltage capacitors before testing resistance or continuity.
• Use the proper jacks, function, and range for your measurement or sourcing application.
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100%
25%
25%
RECALL
STORE
SETUP
0%
Stackable
Test Leads
TL75
Test Lead Set
AC72
Alligator Clips
V
mA
MEASURE
SOURCE / MEASURE
30V MAX ALL TERMINALS
4W
3W
V
Hz
RTD
mA+
mA-
TC
COMCOM
LOOP
sh01f.eps
Figure 1. Standard Equipment
Safety Information
7
Table 2. International Symbols
AC - Alternating current Double insulated
DC - Direct current Battery
Earth ground Refer to the manual for information about
this feature.
Pressure OON/OFF
Conforms to Canadian Standards
Association directives
Conforms to European Union directives
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Getting Acquainted with the Calibrator
Input and Output Terminals
Figure 2 shows the calibrator input and output terminals.
Table 3 explains their use.
V mA
LOOP
V mA
TC RTD
˚
C
˚
F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
87654
3
2
1
sh05f.eps
Figure 2. Input/Output Terminals and Connectors
Getting Acquainted with the Calibrator
9
Table 3. Input/Output Terminals and Connectors
No Name Description
APressure module
connector
Connects the calibrator to a pressure module or the calibrator to a PC for a remote
control connection.
B, CMEASURE V, mA
terminals
Input terminals for measuring voltage, current, and supplying loop power.
DTC 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, FSOURCE/ MEASURE
V, RTD, Hz, Ω
terminals
Terminals for sourcing or measuring voltage, resistance, frequency, and RTDs.
G, HSOURCE/ MEASURE
mA terminals, 3W, 4W
Terminals for sourcing and measuring current, and performing 3W and 4W RTD
measurements.
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Keys
Figure 3 shows the calibrator keys and Table 4 explains
their use.
V mA
LOOP
V mA
TC RTD
˚
C
˚
F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
V mA
LOOP
V mA
TC RTD
˚
C
˚
F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
18
9
10
2
3
46
7
5
12 11
13
14
15
16
17
18
19
20
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
sh41f.eps
Figure 3. Keys
Getting Acquainted with the Calibrator
11
Table 4. Key Functions
No Name Description
AOTurns the power on or off.
BlSelects voltage, mA or Loop Power measurement function in the upper display.
CASelects the pressure measurement function in the upper display. Repeated pushes cycle
through the different pressure units.
DKZeros the pressure module reading. This applies to both upper and lower displays.
ECTurns backlight on or off. Turns Contrast Adjust mode on when powering up.
FFToggles frequency and ohms measurement and sourcing functions.
GDToggles between Centigrade or Fahrenheit when in TC or RTD functions.
HGRecalls from memory a source value corresponding to 100 % of span and sets it as the
source value. Press and hold to store the source value as the 100 % value.
IHIncrements output by 25 % of span.
JIDecrements output by 25 % of span.
KJRecalls 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.
Identifies Firmware version. Press and hold J when powering up.
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Table 4. Key Functions (cont.)
No Name Description
LLCycles through :
Slow repeating 0 % - 100 % - 0 % ramp
Fast repeating 0 % - 100 % - 0 % ramp
Repeating 0 % - 100 % - 0 % ramp in 25 % steps
AM
AM
OY
OZ
Disables Shut Down Mode
Enables Shut Down Mode
MXW
Y Z
Increases or decreases the source level.
Cycles through the 2-, 3-, and 4-wire selections.
Moves through the memory locations of calibrator setups.
In Contrast Adjustment mode; up-darkens contrast, down-lightens contrast.
NQRetrieves a previous calibrator setup from a memory location.
OSSaves the calibrator setup. Saves Contrast Adjust setup.
PCycles the calibrator through MEASURE and SOURCE modes in the lower display.
QTSelects TC (thermocouple) measurement and sourcing function in the lower display. Repeated pushes cycle through
the thermocouple types.
RVToggles between voltage, mA sourcing, or mA simulate functions in the lower display.
SRSelects RTD (resistance temperature detector) measurement and sourcing function in lower display. Repeated pushes
cycle through the RTD types.
TUSelects the pressure measurement and sourcing function. Repeated pushes cycle through the different pressure units.
M
Getting Acquainted with the Calibrator
13
Display
Figure 4 shows the elements of a typical display.
Low Battery
Symbol
Loop
Annunciator
Memory Locations
for Calibrator Setups
Units
Display
Auto
Ramp
Mode
Indicator
sh07f.eps
Figure 4. Elements of a Typical Display
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Getting Started
This section acquaints you with some basic operations of
the calibrator.
Proceed as follows to perform a voltage-to-voltage test:
1. Connect the calibrator’s voltage output to its voltage
input as shown in Figure 5.
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,
and you can see the active measurements 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.
Shut Down Mode
The calibrator comes with the Shut Down mode
enabled for a time duration set to 30 minutes
(displayed for about 1 second when the calibrator is
initially turned on). When the Shut Down mode is
enabled, the calibrator will automatically shut down
after the time duration has elapsed from the time the
last key was pressed. To disable the Shut Down
mode, press O and Y simultaneously. To enable the
mode, press O and Z simultaneously. To adjust the
time duration, press O and Z simultaneously, then
press X and/or W to adjust the time between 1 and
30 minutes.
Shut Down Mode
15
V mA
LOOP
V mA
TCRTD
˚
C
˚
F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
sh39f.eps
Figure 5. Voltage-to-Voltage Test
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Contrast Adjustment
Note
Available with V2.1 Firmware or greater. To
identify firmware version, press and hold J
when powering up. The firmware version will be
shown in the upper units display for about 1
second after initialization.
To adjust the contrast, proceed as follows:
1. Press C and O until Contst Adjust is displayed as
shown in Figure 6.
2. Press and hold X to darken contrast.
3. Press and hold W to lighten contrast.
4. Press S to save the contrast level.
V mA
LOOP
V mA
TC RTD ˚C ˚F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
1
4
2
3
sh06f.eps
Figure 6. Adjusting the Contrast
Using Measure Mode
17
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 pressure instrument, 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, proceed as follows:
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.
V mA
LOOP
V mA
TC RTD ˚C ˚F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
Black
Red
sh42f.eps
Figure 7. Measuring Voltage and Current Output
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18
Red
TEST DC PWR
+–+–
–+
Black
V mA
LOOP
V mA
TC RTD
˚
C
˚
F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
sh18f.eps
Figure 8. Connections for Supplying Loop Power
Using Measure Mode
19
Measuring Electrical Parameters (Lower Display)
To measure the 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, or F for
frequency or resistance.
V mA
LOOP
V mA
TC RTD ˚C ˚F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
sh43f.eps
Figure 9. Measuring Electrical Parameters
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20
Measuring Temperature
Using Thermocouples
The calibrator supports ten standard thermocouples,
including type E, N, J, K, T, B, R, S, L, or U. Table 5
summarizes the ranges and characteristics of the
supported thermocouples.
To measure temperature using a thermocouple, proceed
as follows:
1. Attach the thermocouple leads to the appropriate TC
miniplug, then to the TC input/output as shown in
Figure 10. One pin is wider than the other. Do not try
to force a miniplug in 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
you plug the miniplug into the TC input/output.
2. If necessary, press M for MEASURE mode.
3. Press T for the TC display. If desired, continue
pressing this key to select the desired thermocouple
type.
If necessary, you can toggle between °C or °F
temperature units by pressing D.
Using Measure Mode
21
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
*American National Standards Institute (ANSI) device negative lead (L) is always red.
**International Electrotechnical Commission (IEC) device negative lead (L) is always white.
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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
sh12f.eps
Figure 10. Measuring Temperature with a Thermocouple
Using Measure Mode
23
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, proceed as
follows:
1. If necessary, press M for MEASURE mode.
2. Press
R for the RTD display. If desired, 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.
5. If necessary, you can toggle between °C or °F
temperature units by pressing D.
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Table 6. RTD Types Accepted
RTD Type Ice Point (R0) Material αRange (°C)
Pt100 (3926) 100 ΩPlatinum 0.003926 Ω/°C -200 to 630
Pt100 (385) 100 ΩPlatinum 0.00385 Ω/°C -200 to 800
Ni120 (672) 120 ΩNickel 0.00672 Ω/°C -80 to 260
Pt200 (385) 200 ΩPlatinum 0.00385 Ω/°C -200 to 630
Pt500 (385) 500 ΩPlatinum 0.00385 Ω/°C -200 to 630
Pt1000 (385) 1000 ΩPlatinum 0.00385 Ω/°C -200 to 630
Pt100 (3916) 100 ΩPlatinum 0.003916 Ω/°C -200 to 630
The Pt100 commonly used in U.S. industrial applications is Pt100 (3916), α = 0.003916 Ω/°C. (Also designated as JIS
curve.) The IEC standard RTD is the Pt100 (385), α = 0.00385 Ω/°C.
Using Measure Mode
25
RTD Resistance
to be
measured
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
sh15f.eps
Figure 11. Measuring Temperature with an RTD, Measuring 2-, 3-, and 4-Wire Resistance
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26
Measuring Pressure
Many ranges and types of pressure modules are available
from Fluke. See “Accessories” near the back of this
manual. Before you use 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
Proceed as follows to measure pressure:
W Warning
To avoid a violent release of pressure in a
pressurized system, shut off the valve and
slowly bleed off the pressure before you
attach 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
Caution
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.
Using Measure Mode
27
To avoid damaging the pressure module from
overpressure, never apply pressure above the
rated maximum printed on the pressure
module.
To avoid damaging the pressure module from
corrosion, use it only 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
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 K.
If desired, continue pressing A to change pressure
display units to psi, mmHg, inHg, cmH2O@4 °C,
cmH2O@20 °C, inH2O@4 °C, inH2O@20 °C, 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 K, REF Adjust will appear 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 Kagain to exit 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.
725
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28
Differential
Module
Tank
HL
Isolation
Valve
Gage
Module
V mA
LOOP
V mA
TC RTD
˚
C
˚
F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
sh37f.eps
Figure 13. Connections for Measuring Pressure
Using Source Mode
29
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; and 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
you want by pressing X and W keys.
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 and W
keys.
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 F for frequency or
resistance.
4. Enter the desired output value by pressing X and
W keys. Press Y and Z to select a different digit to
change.
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30
Loop
Power
Supply
Readout or
Controller
+24 V
Black
Red
+
–
V mA
LOOP
V mA
TC RTD
˚
C
˚
F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
sh17f.eps
Figure 14. Connections for Simulating a 4- to 20-mA Transmitter
Using Source Mode
31
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
sh16f.eps
Figure 15. Electrical Sourcing Connections
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32
Simulating Thermocouples
Connect the calibrator TC input/output to the instrument
under test with 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. Do not
try to force a miniplug in 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.
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 temperature you want by pressing X and
W keys. Press Y and Z to select a different digit to
edit.
4. If the 725 display indicates ExI HI, the excitation
current from your device under test exceeds the limits
of the 725.
Using Source Mode
33
TEST DC PWR
++–
–+
Color depends
on type of TC
V mA
LOOP
V mA
TC RTD
˚
C
˚
F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
TC
TC Miniplug
sh20f.eps
Figure 16. Connections for Simulating a Thermocouple
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Users Manual
34
V mA
LOOP
V mA
TCRTD
˚
C
˚
F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
BLACK
SENSOR TERMINALS
BLACK
RED
1
2
3
4
sh40f.eps
Figure 17. Connections for Simulating 3-Wire RTD
Using Source Mode
35
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 20 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” near the back of this
manual. Before you use 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 you
attach the pressure module to the pressure
line.
Caution
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.
To avoid damaging the pressure module from
overpressure, never apply pressure above the
rated maximum printed on the pressure
module.
To avoid damaging the pressure module from
corrosion, use it only with specified
materials. Refer to the printing on the
pressure module or the pressure module
instruction sheet for the acceptable material
compatibility.
725
Users Manual
36
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, mbar,
bar, kg/cm2, or kPa.
V mA
LOOP
V mA
TC RTD
˚
C
˚
F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
sh19f.eps
Figure 18. Connections for Sourcing Pressure
Setting 0 % and 100 % Output Parameters
37
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, you must set the 0 % and
100 % points before you can use 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. Our example is temperature
source using 100 °C and 300 °C values for source.
3. Enter 100 °C and press and hold J to store the
value.
4. Enter in 300 °C and press and hold G to store the
value.
You can now use this setting for the following:
• Manually stepping an output with 25 % increments.
• Jump between the 0 and 100 % span points by
momentarily pushing J or G.
Stepping and Ramping the Output
Two 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 that you use an external
pressure source.
Manually Stepping the mA Output
To manually step current output you can do the following:
• Use
H or I to step the current up or down in
25 % steps.
• Touch momentarily either J to go to 0 %, or G
to go to 100 %.
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Auto Ramping the Output
Auto ramping gives you the ability to continuously apply a
varying stimulus from the calibrator to a transmitter, while
your hands remain free to test the response of the
transmitter.
When you press L, the calibrator produces a
continuously repeating 0 % - 100 % - 0 % ramp in your
choice of three ramp waveforms:
• E0 % - 100 % - 0 % 40-second smooth ramp
• P0 % - 100 % - 0 % 15-second smooth ramp
• N0 % - 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
You can store up to eight of your settings in a nonvolatile
memory and recall the settings for later use. A low battery
condition or a battery change does not jeopardize the
stored settings. Proceed as follows:
1. After you create a calibrator setup, press S. In the
display, the memory locations appear.
2. Press
Y or Z to select locations one through eight. An
underscore appears below the selected memory
location.
3. Press S, only the stored memory location will be
displayed. The setup is stored.
To recall setups, proceed as follows.
1. Press
Q. The memory locations appear on the
display.
2. Press
Y or Z to select the appropriate location and
press Q.
Calibrating a Transmitter
39
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.
Connect the calibrator to the instrument under test as
shown in Figure 19. Proceed as follows to calibrate a
transmitter
1. Press
l for current (upper display). If required,
press l again to activate loop power.
2. Press
T (lower display). If desired, continue
pressing this key to select the desired thermocouple
type.
3. If necessary, press M for SOURCE mode.
4. Set your zero and span parameters by pressing X
and W keys. Enter these parameters by pressing and
holding J and G. For more information on
setting parameters, see “Setting 0 % and 100 %”
earlier in this manual.
5. Perform test checks at 0-25-50-75-100 % points by
pressing H or I. Adjust the transmitter as
necessary.
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40
Red
TEST DC PWR
+–+–
–+
Black
V mA
LOOP
V mA
TC RTD
˚
C
˚
F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
sh44f.eps
Figure 19. Calibrating a Thermocouple Transmitter
Calibrating a Pressure Transmitter
41
Calibrating a Pressure Transmitter
The following example shows how to calibrate a pressure
transmitter.
Connect the calibrator to the instrument under test as
shown in Figure 20. Proceed as follows:
1. Press
l for current (upper display). If required,
press l again to activate loop power.
2. Press
U (lower display).
3. If necessary, press M for SOURCE mode.
4. Zero the pressure module.
5. Perform checks at 0 % and 100 % of span and adjust
the transmitter as necessary.
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Users Manual
42
Hand Pump
SIGNAL
TEST
+–
Pressure
Module
Red
Black
Measure mA
Source Pressure
24 V Loop Power
Enabled
MULTIFUNCTION CALIBRATOR
725
V mA
LOOP
V mA
TC RTD
˚
C
˚
F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
sh34f.eps
Figure 20. Calibrating a Pressure-to-Current (P/I) Transmitter
Calibrating an I/P Device
43
Calibrating an I/P Device
The following test allows you to calibrate a device that
controls pressure. Proceed as follows:
1. Connect the test leads to the instrument under test as
shown in Figure 21. 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
keys. Press Y and Z to select different digits.
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44
SIGNAL
TEST
+–
Pressure
Module
Red
Black
Measure
Pressure
Source mA
V mA
LOOP
V mA
TC RTD
˚
C
˚
F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
sh28f.eps
Figure 21. Calibrating a Current-to-Pressure (I/P) Transmitter
Testing an Output Device
45
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 22.
2. Press
V for current or dc voltage, or F for
frequency or resistance (lower display).
3. If necessary, press M for SOURCE mode.
V mA
LOOP
V mA
TC RTD ˚C ˚F
Hz
100%
25%
25%
RECALL
ZERO
MEAS
SOURCE
STORE
SETUP
0%
MULTIFUNCTION CALIBRATOR
725
Black
Red
0 to 1 V dc
Input
sh25f.eps
Figure 22. Calibrating a Chart Recorder
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Users Manual
46
Remote Control Commands
You can control the calibrator remotely 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 Table
8A-8C for the remote commands and explanations.
The Fluke 700SC Serial Interface Cable Assembly (PN
667425) plugs into the pressure module connector and
terminates in a DB-9 connector which plugs directly into a
PC serial port. A DB-9 to DB-25 adapter is required to
connect to a PC.
The remote control interface on the 725 is activated by
turning the calibrator off, then turning it on again while
depressing the M key. The calibrator will initialize with its
remote port enabled. The terminal emulator connected to
the calibrator should be set up for: 9600 baud, no parity,
8 data bits, and 1 stop bit.
Table 8A. Remote Control Upper Display
Serial Input Description
j mA measurement
L mA Loop Power
E Volts measurement
B Single broadcast of most recent upper display value and units
Table 8B. Remote Control Lower Display
Serial Input Description
A mA measurement
a mA source
I mA 2W Sim
V Volts measurement
v Volts source
M mV measurement
m mV source
K KHz measurement
Remote Control Commands
47
Table 8B. Remote Control Lower Display (cont)
Serial Input Description
k KHz source
H Hz measurement
h Hz source
P CPM measurement
p CPM source
O Ohms measurement (default 2W)
o Select Ohms source
W 2-wire measurement (Ohms and RTDs)
X 3-wire measurement (Ohms and RTDs)
Y 4-wire measurement (Ohms and RTDs)
T Thermocouple measurement (default Type J) use “S” command to select sensor type
t Thermocouple source (default Type J) use “S” command to select sensor type
C Selects Centigrade ( T/C-RTD)
F Selects Fahrenheit ( T/C-RTD)
R RTD measurement mode (default Pt100 385) use “S” command to select sensor type
r RTD measurement mode (default Pt100 385) use “S” command to select sensor type
u Increment display source value
d Decrement display source value
< The < arrow key PC keyboard selects left arrow on 725
> The > arrow key PC keyboard selects right arrow on 725
725
Users Manual
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Table 8B. Remote Control Lower Display (cont)
Serial Input Description
0-9 Enter a source value using ascii characters 0,1,2,...9,-,.terminated by <CR> (carriage return)
-,.
<CR>
b Single Broadcast of most recent lower display value and units
Table 8C. "S" Commands Select Sensor Type
Selection Entry
Serial
Input No. Thermocouple Type RTD Type
S 1 J Pt100 (3926)
2 K Pt100 (385)
3 T Pt100 (3916)
4 E Pt200 (385)
5 R Pt500 (385)
6 S Pt1000 (385)
7 B Ni120
8L
9U
AN
BmV
Replacing the Batteries
49
Replacing the Batteries
WWarning
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 23 shows you how to replace the battery.
Replacing the Fuses
The calibrator comes equipped with two 0.05A, 250V,
socketed fuses to protect the calibrator.
WWarning
To avoid electrical shock, remove the test
leads from the calibrator before opening the
battery door. Close and latch the battery
door before using the calibrator.
The fuses can be removed and checked for resistance. A
value of < 10 Ω is good. Problems while measuring using
the right jacks indicate that F3 may have opened. If you
can’t measure or source current with the left jacks, F4
may have opened. To replace the fuses, refer to Figure
23 and perform the following steps:
1. Turn the calibrator off, remove the test leads from the
terminals, and hold the calibrator face down.
2. Using a flat-blade screwdriver, turn the battery door
screws 1/4-turn counterclockwise and remove the
battery door.
3. Remove and replace the damaged fuse.
4. Replace the battery door and secure it by turning the
screws 1/4-turn clockwise.
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50
Battery and
Compartment
Fuse
Compartment
sh38f.eps
Figure 23. Replacing the Battteries
Maintenance
Cleaning the Calibrator
W Warning
To avoid personal injury or damage to the
calibrator, use only the specified
replacement parts and do not allow water
into the case.
Caution
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.
Verify that the calibrator is being operated in accordance
with the instructions in this manual. If the calibrator is
faulty, send a description of the failure with the calibrator.
Pressure modules do not need to accompany the
calibrator unless the module is faulty also. Be sure to
Maintenance
51
pack the calibrator securely, using the original shipping
container if it is available. Send the equipment postage
paid and insured, to the nearest Service Center. Fluke
assumes no responsibility for damage in transit.
The Fluke 725 calibrator covered by the warranty will be
promptly repaired or replaced (at Fluke’s option) and
returned to you at no charge. See the back of the title
page for warranty terms. If the warranty period has
expired, the calibrator will be repaired and returned for a
fixed fee. If the calibrator or pressure module is not
covered under the warranty terms, contact an authorized
service center for a price quote for repair.
To locate an authorized service center, refer to
“Contacting Fluke” at the beginning of the manual.
Replacement Parts
Table 9 lists the part number of each replaceable part.
Refer to Figure 24.
Table 9. Replacement Parts
Item Description PN Qty.
1 Case top 664232 1
2 LCD mask 664273 1
3 Elastomeric strips 802063 2
4 Input/output bracket 691391 1
5 LCD bracket 667287 1
6 Mounting screws 494641 11
7 Backlight 690336 1
8 LCD 690963 1
9 Keypad 690955 1
10 Case bottom 664235 1
11 AA alkaline batteries 376756 4
12 Case screws 832246 4
13 Battery door 664250 1
14 Accessory mount 658424 1
15 Tilt stand 659026 1
16 Battery door 1/4-turn
fasteners
948609 2
17 TL75 series test leads 855742 1
18 Test lead, red
Test lead, black
688051
688066
1
1
19 725 Product Overview
Manual
1549644 1
20 AC72 alligator clip, red
AC72 alligator clip, black
1670641
1670652
1
1
21 CD ROM, contains User
Manual
1549615 1
22 Input Decal 690948 1
23 Fuse 0.05A/250V 2002234 2
725
Users Manual
52
1
8
6
6
9
19
10
12
13
2
18
20
17
3
4
5
3
7
16
11
14
15
21 23
22
zi45f.eps
Figure 24. Replacement Parts
Accessories
53
Accessories
For more information about these accessories and their
prices, contact your Fluke representative. Pressure
Modules and Fluke model numbers (see Table 10) are
listed below. (Differential models also operate in gage
mode.) 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 725’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 10. 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/cm215 psi and above
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Table 11. 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
Accessories
55
Table 11. 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
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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 5 minute warmup period.
DC Voltage Measurement
Range Resolution
Accuracy,
(% of Reading + Counts)
30 V
(upper
display)
0.001 V 0.02 % + 2
20 V
(lower
display)
0.001 V 0.02 % + 2
90 mV 0.01 mV 0.02 % + 2
Temperature coefficient -10 °C to 18 °C, +28 °C to
55 °C: ±0.005 % of range per °C
DC Voltage Source
Range Resolution
Accuracy,
(% of Reading + Counts)
100 mV 0.01 mV 0.02 % + 2
10 V 0.001 V 0.02 % + 2
Temperature coefficient -10 °C to 18 °C, +28 °C to
55 °C: ±0.005 % of range per °C
Maximum load: 1 mA
Millivolt Measurement and Source*
Range Resolution Accuracy
-10 mV to 75 mV 0.01 mV ±(0.025 % + 1 count)
Maximum input voltage: 30 V
Temperature coefficient -10 °C to 18 °C, +28 °C to
55 °C: ±0.005 % of range per °C
*Select this function by pressing T. The signal is
available at the thermocouple miniplug connector.
Specifications
57
DC mA Measurement and Source
Range Resolution
Accuracy,
(% of Reading + Counts)
24 mA 0.001 mA 0.02 % + 2
Temperature coefficient -10 °C to 18 °C, +28 °C to
55 °C: ±0.005 % of range per °C
Drive capability: 1000 Ω at 20 mA
Ohms Measurement
Accuracy ± Ω*
Ohms Range 4-Wire 2- and 3-Wire
0 to 400 Ω0.1 0.15
400 to 1.5 kΩ0.5 1.0
1.5 to 3.2 kΩ11.5
Temperature coefficient -10 °C to 18 °C, +28 °C to
55 °C: ±0.005 % of range per °C
Excitation Current: 0.2 mA
Maximum input voltage: 30 V
* 2-wire: Does not include lead resistance.
3-wire: Assumes matched leads with a total resistance
not exceeding 100 Ω.
Ohms Source
Ohms Range
Excitation Current from
Measurement Device
Accuracy
± Ω
15 to 400 Ω0.15 to 0.5 mA 0.15
15 to 400 Ω0.5 to 2 mA 0.1
400 to 1.5 kΩ0.05 to 0.8 mA 0.5
1.5 to 3.2 kΩ0.05 to 0.4 mA 1
Temperature coefficient -10 °C to 18 °C, +28 °C to
55 °C: ± 0.005 % of resistance range per °C
Resolution
15 to 400 Ω0.1 Ω
400 to 3.2 kΩ1 Ω
Frequency Measurement
Range Resolution Accuracy
2.0 to 1000.0 CPM 0.1 CPM ± (0.05 % + 1 count)
1 to 1000 Hz 0.1 Hz ± (0.05 % + 1 count)
1.0 to 10.0 kHz 0.01 kHz ± (0.05 % + 1 count)
Sensitivity: 1V peak-to-peak minimum
Waveform: squarewave
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Frequency Source
Range
Resolution
Accuracy
(% of output
frequency)
2.0 to 1000.0 CPM 0.1 CPM ± 0.05 %
1 to 1000 Hz 1 Hz ± 0.05 %
1.0 to 10.0 kHz 0.1 kHz ± 0.25 %
Waveform: 5 V p-p squarewave, -0.1 V offset
Temperature, Thermocouples
Type
Range
Measure and Source
Accuracies (ITS-90)
J -200 to 0 °C
0 to 1200 °C 1.0 °C
0.7 °C
K -200 to 0 °C
0 to 1370 °C 1.2 °C
0.8 °C
T -200 to 0 °C
0 to 400 °C 1.2 °C
0.8 °C
E -200 to 0 °C
0 to 950 °C 0.9 °C
0.7 °C
R -20 to 0 °C
0 to 500 °C
500 to 1750 °C
2.5 °C
1.8 °C
1.4 °C
S -20 to 0 °C
0 to 500 °C
500 to 1750 °C
2.5 °C
1.8 °C
1.5 °C
B 600 to 800 °C
800 to 1000 °C
1000 to 1800 °C
2.2 °C
1.8 °C
1.4 °C
L -200 to 0 °C
0 to 900 °C 0.85 °C
0.7 °C
U -200 to 0 °C
0 to 400 °C 1.1 °C
0.75 °C
N -200 to 0 °C
0 to 1300 °C 1.5 °C
0.9 °C
XK -200 to -100 °C
-100 to 800 °C
0.5 °C
0.6 °C
BP 0 to 800 °C
800 to 2500 °C 1.2 °C
2.5 °C
Resolution:
J, K, T, E, L, N, U, XK, BP: 0.1 °C, 0.1 °F
B, R, S: 1 °C, 1 °F
Specifications
59
Loop Power Supply
Voltage: 24 V
Maximum current: 22 mA
Short circuit protected
RTD Excitation (simulation)
Allowable Excitation by RTD type
Ni 120 0.15 to 3.0 mA
Pt 100-385 0.15 to 3.0 mA
Pt 100-392 0.15 to 3.0 mA
Pt 100-JIS 0.15 to 3.0 mA
Pt 200-385 0.15 to 3.0 mA
Pt 500-385 0.05 to 0.80 mA
Pt 1000-385 0.05 to 0.40 mA
Temperature, RTD Ranges, and Accuracies (ITS-90)
Accuracy
Type Range °C Measure 4-Wire °C Measure 2- and 3-Wire* °C Source °C
Ni120 -80 to 260 0.2 0.3 0.2
Pt100-385 - 200 to 800 0.33 0.5 0.33
Pt100-392 -200 to 630 0.3 0.5 0.3
Pt100-JIS -200 to 630 0.3 0.5 0.3
Pt200-385 -200 to 250
250 to 630 0.2
0.8 0.3
1.6 0.2
0.8
Pt500-385 -200 to 500
500 to 630 0.3
0.4 0.6
0.9 0.3
0.4
Pt1000-385 -200 to 100
100 to 630 0.2
0.2 0.4
0.5 0.2
0.2
Resolution: 0.1 °C, 0.1 °F
Allowable excitation current (source): Ni120, Pt100-385, Pt100-392, Pt100-JIS, Pt200-385: 0.15 to 3.0 mA
Pt500-385: 0.05 to 0.80 mA; Pt1000-385: 0.05 to 0.40 mA
RTD Source: Addresses pulsed transmitters and PLCs with pulses as short as 5 ms.
* 2-wire: Does not include lead resistance.
3-wire: Assumes matched leads with a total resistance not exceeding 100 Ω.
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Pressure Measurement
Range Resolution Accuracy Units
Determined by
pressure module
5 digits Determined by
pressure module
psi, inH2O@4 °C, inH2O@20 °C, kPa, cmH2O@4 °C,
cmH2O@20 °C, bar, mbar, kg/cm2, mmHg, inHg
General Specifications
Operating temperature -10 °C to 55 °C
Storage temperature - 20 °C to 71 °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 EN 61010-1:1993, ANSI/ISA S82.01-1994; CAN/CSA C22.2
No 1010.1:1992
Power requirements 4 AA alkaline batteries
Size 96 x 200 x 47 mm. (3.75 x 7.9 x 1.86 in)
Weight 650 gm (1 lb, 7 oz)
61
Index
—0—
0% output parameter, setting, 36
—1—
100% output parameter, setting, 36
—4—
4 to 20 mA transmitter
simulating, 28
—A—
Accessories, 52
Auto ramping output, 37
—B—
Battery, replacing, 48
—C—
Calibration, 49
Cleaning calibrator, 49
Connections
for pressure measurement, 25
for pressure sourcing, 35
—D—
Display, 13
—E—
Electrical parameters
measurement, 18
sourcing, 28
—G—
Getting started, 14
—I—
I/P device, calibrating, 42
Input terminals, 8
Input/output terminals and connectors
(table), 9
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—K—
Key functions (table), 11
Keys, 10
—L—
Loop power
simulating, 28
supplying, 16
—M—
Measure functions, summary (table), 2
Measure mode, 16
Measuring
pressure, 25
temperature with RTDs, 22
temperature with thermocouples, 19
—O—
Output device, testing, 44
Output terminals, 8
—P—
Parts list, 50
Pressure modules available, 52
Pressure modules, zeroing, 26
Pressure transmitter, calibrating, 40
—R—
Recalling setups, 37
Remote control commands, 45
Repair, 49
RTD
simulating, 31
RTD
measuring, 22
types, 22
—S—
Safety information, 3
Servicing, 49
Setup
recalling, 37
storing, 37
Thermocouple, 31
Simulating
loop power, 28
RTD, 31
thermocouples, 31
Source functions, summary (table), 2
Source mode, 28
Sourcing
4 to 20 mA, 28
electrical parameters, 28
pressure, 34
thermocouples, 31
Specifications, 55
Standard equipment, 3
Stepping output, 36
Storing setups, 37
—T—
Temperature
measuring with RTD, 22
measuring with thermocouple, 19
Terminals
input, 8
output, 8
Thermocouple
measuring, 19
measuring temperature, 19
sourcing, 31
types, 19
Transmitter
4 to 20 mA, simulating, 28
Transmitter, calibrating, 38
—Z—
Zeroing pressure modules, 26

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