Fluke 725/FPC User manual

725

Multifunction Process Calibrator

®

October, 1998 Rev.3, 5/04

© 1998-2004 Fluke Corporation, All rights reserved.
All product names are trademarks of their respective companies.

Users Manual

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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, ARISI N G 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.

11/99

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Table of Contents

Title Page

Introduction....................................................................................................................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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Users Manual

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

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Contents (continued)

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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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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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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Users Manual

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

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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 reference­junction 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.

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Users Manual

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 Ω 15 Ω to 3200 Ω
Thermocouple Types E, J, K, T, B, R, S, L, U, N, mV
RTD

(Resistance­Temperature
Detector)

Pressure 27 modules ranging from 10 in. H2O to

10,000 psi

Other functions Loop supply, Step, Ramp, Memory, Dual display

Pt100 Ω (385)
Pt100 Ω (3926)
Pt100 Ω (3916)
Pt200 Ω (385)

Pt500 Ω (385)
Pt1000 Ω (385)
Ni120

27 modules ranging from 10 in. H2O to
10,000 psi using an external pressure source
(hand pump)

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Standard Equipment

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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725

Users Manual

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.

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Safety Information

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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725

Users Manual

AC72

Alligator Clips

Test Lead Set

TL75

mA

4W

Stackable
Test Leads

Figure 1. Standard Equipment

3W

mA

-

SOURCE / M

+

STORE
SETUP

RECALL

30V MAX ALL TERMINALS

EASURE

V

Hz
RTD

COM

100%

25%

25%

0%

MEASURE

V

TC

mA

LOOP

COM

sh01f.eps

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Safety Information

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
Conforms to Canadian Standards

Association directives

O

ON/OFF
Conforms to European Union directives

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725

Users Manual

Getting Acquainted with the Calibrator

Input and Output Terminals

Figure 2 shows the calibrator input and output terminals.
Table 3 explains their use.

1

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MULTIFUNCTION CALIBRATOR

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

MEAS

SOURCE

STORE
SETUP

RECALL

V mA

LOOP

2

8

7

6

5

3

4

sh05f.eps

Figure 2. Input/Output Terminals and Connectors

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Table 3. Input/Output Terminals and Connectors

No Name Description

Getting Acquainted with the Calibrator

A

B, C

D

E, F

G, H

Pressure module
connector

MEASURE V, mA
terminals

TC input/output Terminal for measuring or simulating thermocouples. This terminal accepts a miniature

SOURCE/ MEASURE
V, RTD, Hz, Ω
terminals

SOURCE/ MEASURE
mA terminals, 3W, 4W

Connects the calibrator to a pressure module or the calibrator to a PC for a remote
control connection.

Input terminals for measuring voltage, current, and supplying loop power.

polarized thermocouple plug with flat, in-line blades spaced 7.9 mm (0.312 in) center to
center.

Terminals for sourcing or measuring voltage, resistance, frequency, and RTDs.

Terminals for sourcing and measuring current, and performing 3W and 4W RTD
measurements.

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725

Users Manual

Keys

Figure 3 shows the calibrator keys and Table 4 explains
their use.

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MULTIFUNCTION CALIBRATOR

3

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MULTIFUNCTION CALIBRATOR

10

2

4

20

19

18

V mA

TC RTD

V
Hz

RTD

COM COM

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

MEASURE

V

TC

mA

LOOP

V mA

MEAS

SOURCE

STORE

SETUP

RECALL

SOURCE / MEASURE

+

mA
3W

-

mA
4W

LOOP

30V MAX ALL TERMINALS

V mA

TC RTD

V
Hz

RTD

COM COM

ZERO

16

14

17

15

13

12

Hz

C ˚F

˚

100%

25%

25%

0%

MEASURE

V

TC

mA

LOOP

5

V mA

LOOP

MEAS

1

SOURCE

STORE

SETUP

RECALL

SOURCE / MEASURE

+

mA
3W

-

mA
4W

30V MAX ALL TERMINALS

6

7

8

9

10

11

sh41f.eps

Figure 3. Keys

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Getting Acquainted with the Calibrator

Table 4. Key Functions

No Name Description

A O Turns the power on or off.
B l Selects voltage, mA or Loop Power measurement function in the upper display.
C A Selects the pressure measurement function in the upper display. Repeated pushes cycle

through the different pressure units.

D K Zeros the pressure module reading. This applies to both upper and lower displays.
E C Turns backlight on or off. Turns Contrast Adjust mode on when powering up.
F F Toggles frequency and ohms measurement and sourcing functions.
G D Toggles between Centigrade or Fahrenheit when in TC or RTD functions.
H G Recalls 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.

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.
Identifies Firmware version. Press and hold J when powering up.

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725

Users Manual

Table 4. Key Functions (cont.)

No Name Description

L L

AM
AMOYOZ
M XW

Y Z

N Q
O S

P

M

Q T

R V

S R

T U

12

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
Disables Shut Down Mode
Enables Shut Down Mode

Increases or decreases the source lev el.
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 c ont ras t .

Retrieves a previous calibrator setup from a memory location.
Saves the calibrator setup. Saves Contrast Adjust setup.

Cycles the calibrator through MEASURE and SOURCE modes in the lower dis play .
Selects TC (thermocouple) measurement and sourcing function in the lower display. Repeated pushes cycle through

the thermocouple types.
Toggles between voltage, mA sourcing, or mA simulate functions in the lower display .

Selects RTD (resistance temperature detector) measurement and sourcing f unc t ion in lower display . Repeat ed pus hes
cycle through the RTD types.

Selects the pressure measurement and sourcing function. Repeated pushes cycle through the different pressure units.

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Display

Figure 4 shows the elements of a typical display.

Getting Acquainted with the Calibrator

Low Battery

Symbol

Mode

Indicator

Loop

Annunciator

Figure 4. Elements of a Typical Display

Memory Locations

for Calibrator Setups

Units
Display

Auto
Ramp

sh07f.eps

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725

Users Manual

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

5. Press

V to select dc voltage sourcing.

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

7. Press H and I to step between 0 and 100 %

X to increase the output to 5 V. Press and

G to enter 5 V as the 100 % value.

hold

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.

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STORE
SETUP

RECALL

SOURCE

Shut Down Mode

725

MULTIFUNCTION CALIBRATOR

V mA

LOOP

ZERO

V mA

MEAS

TC

Hz

RTD

C

F

˚

˚

100%

25%

25%

0%

Figure 5. Voltage-to-Voltage Test

sh39f.eps

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Users Manual

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.

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MULTIFUNCTION CALIBRATOR

1

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.

16

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

V mA

LOOP

MEAS

SOURCE

STORE

SETUP

RECALL

4

Figure 6. Adjusting the Contrast

2

3

sh06f.eps

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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:

725

MULTIFUNCTION CALIBRATOR

Using Measure Mode

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

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

Red

MEAS

SOURCE

STORE
SETUP

RECALL

V mA

LOOP

Black

Figure 7. Measuring Voltage and Current Output

sh42f.eps

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Users Manual

725

MULTIFUNCTION CALIBRATOR

Red

18

MEAS

SOURCE

STORE

SETUP

RECALL

V mA

LOOP

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

TEST DC PWR

+–+–

–+

Black

Figure 8. Connections for Supplying Loop Power

sh18f.eps

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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.

Using Measure Mode

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MULTIFUNCTION CALIBRATOR

2. If necessary, press
display)

3. Press

V for dc voltage or current, or F for

frequency or resistance.

M for MEASURE mode (lower

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

MEAS

SOURCE

STORE

SETUP

RECALL

V mA

LOOP

Figure 9. Measuring Electrical Parameters

sh43f.eps

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725

Users Manual

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

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

M for MEASURE mode.

D.

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Using Measure Mode

Table 5. Thermocouple Types Accepted

Positive Lead (H)

Type Positive Lead

Material

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.

Color Negative Lead Specified Range

ANSI* IEC**

Material (°C)

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725

Users Manual

SOURCE / MEASURE

+

mA

3W

-

mA
4W

30V MAX ALL TERMINALS

V

TC

TC

mA

LOOP

Hz
RTD

COM COM

MEASURE

V

Process Temperature

Warning

22

TC Miniplug

30 V maximum to

sh12f.eps

Figure 10. Measuring Temperature with a Thermocouple

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Using Measure Mode

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 R
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.

. The most common R

0

To measure temperature using an RTD input, proceed as
follows:

1. If necessary, press

0

2. Press

3. Press

4. Attach the RTD to input terminals as shown in

5. If necessary, you can toggle between °C or °F

R for the RTD display. If desired, continue

pressing this key to select the desired RTD type.

X or W to select a 2-, 3-, or 4- wire

connection.

Figure 11.

temperature units by pressing

M for MEASURE mode.

D.

23

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Users Manual

Table 6. RTD Types Accepted

RTD Type Ice Point (R

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 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.

) Material α Range (°C)

0

24

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2W

3W

4W

SOURCE / MEASURE

+

mA

3W

-

mA
4W

SOURCE / MEASURE

+

mA

3W

-

mA
4W

SOURCE / MEASURE

+

mA

3W

-

mA
4W

30V MAX ALL TERMINALS

V

TC

Hz
RTD

COM COM

30V MAX ALL TERMINALS

V

TC

Hz
RTD

COM COM

30V MAX ALL TERMINALS

V

TC

Hz
RTD

COM COM

mA

LOOP

mA

LOOP

mA

LOOP

MEASURE

V

MEASURE

V

MEASURE

V

Using Measure Mode

RTD

RTD

RTD

Resistance
to be
measured

Figure 11. Measuring Temperature with an RTD, Measuring 2-, 3-, and 4-Wire Resistance

sh15f.eps

25

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725

Users Manual

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:

Gage

700P06

PRESSURE MODULE

RANGE

100 PSIG

BURST PRESSURE 300 PSIG

7 bar700 kPa

Differential

700P04

PRESSURE MODULE

RANGE

15 PSID/G

1 bar100 kPa

BURST PRESSURE 45 PSIG

HighLow

gj11f.eps

Figure 12. Gage and Differential Pressure Modules

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.

26

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.

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Using Measure Mode

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

If desired, continue pressing
display units to psi, mmHg, inHg, cmH

K.

A to change pressure

O@4 °C,

2

O@20 °C, inH2O@4 °C, inH2O@20 °C, mbar,

cmH

2

2

bar, kg/cm

, 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.

27

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725

MULTIFUNCTION CALIBRATOR

Isolation

Valve

Gage

Module

28

MEAS

SOURCE

STORE

SETUP

RECALL

V mA

LOOP

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

Differential

Module

HL

Tank

sh37f.eps

Figure 13. Connections for Measuring Pressure

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Using Source Mode

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

3. Press

V for current and enter the desired current

you want by pressing

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.

M for SOURCE mode.

X and W keys.

2. If necessary, press

3. Press

4. Enter the desired current by pressing

V until both mA and SIM display.

keys.

M for SOURCE mode.

X and W

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

3. Press

4. Enter the desired output value by pressing

V for dc voltage, or F for frequency or

resistance.

Mfor SOURCE mode.

X and

W keys. Press Y and Z to select a different digit to

change.

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Users Manual

725

MULTIFUNCTION CALIBRATOR

30

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

V mA

LOOP

MEAS

Red

+

+24 V

SOURCE

STORE

SETUP

RECALL

Loop

Power

Supply

–

Figure 14. Connections for Simulating a 4- to 20-mA Transmitter

Black

Readout or

Controller

sh17f.eps

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Using Source Mode

mA

30V MAX ALL TERMINALS

SOURCE / MEASURE

+ mA

+

mA

Red

+

3W

-

mA
4W

–

V
Hz

RTD

COM COM

MEASURE

V

TC

mA

LOOP

Black

V

+

Hz

Red

SOURCE / MEASURE

+

mA

3W

-

mA
4W

–

Black

Common

30V MAX ALL TERMINALS

V

TC

mA

Hz

LOOP

RTD

COM COM

Common

MEASURE

V

sh16f.eps

Figure 15. Electrical Sourcing Connections

31

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Users Manual

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

3. Press

4. Enter the temperature you want by pressing

T for the TC display. If desired, continue

pressing this key to select the desired thermocouple
type.

M for SOURCE mode.

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

2. Press

R for the RTD display.

M for SOURCE mode.

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 3­wire or 4-wire transmitter, use the stacking
cables to provide the extra wires. See Figure 17.

3. Enter the temperature you want by pressing

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.

X and

32

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MULTIFUNCTION CALIBRATOR

Color depends

on type of TC

TEST DC PWR

++–

Using Source Mode

MEAS

SOURCE

STORE

SETUP

RECALL

V mA

LOOP

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

TC

–+

TC Miniplug

Figure 16. Connections for Simulating a Thermocouple

sh20f.eps

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Users Manual

RECALL

SOURCE

STORE
SETUP

SENSOR TERMINALS

725

MULTIFUNCTION CALIBRATOR

1

4

3

2

V mA

LOOP

ZERO

V mA

MEAS

TC

Hz

RTD

C

F

˚

˚

100%

25%

25%

0%

BLACK

RED

BLACK

Figure 17. Connections for Simulating 3-Wire RTD

sh40f.eps

34

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Using Source Mode

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.

35

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725

Users Manual

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
display units to psi, mmHg, inHg, cmH

O@20 °C, inH2O@4 °C, inH2O@20 °C, mbar,

cmH

2

2

bar, kg/cm

, or kPa.

U to change pressure

O@4 °C,

2

36

725

MULTIFUNCTION CALIBRATOR

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

MEAS

SOURCE

STORE

SETUP

RECALL

V mA

LOOP

Figure 18. Connections for Sourcing Pressure

sh19f.eps

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Setting 0 % and 100 % Output Parameters

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

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
value.

4. Enter in 300 °C and press and hold
value.

M for SOURCE mode.

J to store the

G to store the

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
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

• Touch momentarily either

H or I to step the current up or down in

25 % steps.

J to go to 0 %, or G

to go to 100 %.

H and I

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Users Manual

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
continuously repeating 0 % - 100 % - 0 % ramp in your
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.

Step 4 to 20 mA

0 % 4.000
25 % 8.000
50 % 12.000
75 % 16.000
100 % 20.000

L, the calibrator produces a

Table 7. mA Step Values

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
display, the memory locations appear.

2. Press

3. Press S, only the stored memory location will be

To recall setups, proceed as follows.

1. Press

2. Press

Y or Z to select locations one through eight. An

underscore appears below the selected memory
location.

displayed.

The setup is stored.

Q. The memory locations appear on the

display.

Y or Z to select the appropriate location and
Q.

press

S. In the

38

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Calibrating a Transmitter

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

2. Press

3. If necessary, press

l for current (upper display). If required,

l again to activate loop power.

press

T (lower display). If desired, continue

pressing this key to select the desired thermocouple
type.

M for SOURCE mode.

4. Set your zero and span parameters by pressing
and W keys. Enter these parameters by pressing and
holding
setting parameters, see “Setting 0 % and 100 %”
earlier in this manual.

5. Perform test checks at 0-25-50-75-100 % points by
pressing
necessary.

J and G. For more information on

H or I. Adjust the transmitter as

X

39

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Users Manual

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MULTIFUNCTION CALIBRATOR

Red

40

MEAS

SOURCE

STORE

SETUP

RECALL

V mA

LOOP

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

TEST DC PWR

+–+–

–+

Black

Figure 19. Calibrating a Thermocouple Transmitter

sh44f.eps

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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:

Calibrating a Pressure Transmitter

1. Press

2. Press

3. If necessary, press

4. Zero the pressure module.

5. Perform checks at 0 % and 100 % of span and adjust

l for current (upper display). If required,

l again to activate loop power.

press

U (lower display).

M for SOURCE mode.

the transmitter as necessary.

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Users Manual

Hand Pump

42

MEAS

SOURCE

STORE
SETUP

RECALL

V mA

LOOP

725

V mA

TC RTD

MULTIFUNCTION CALIBRATOR

ZERO

Measure mA
Source Pressure
24 V Loop Power
Enabled

Pressure

Module

Hz

C ˚F

˚

100%

25%

25%

0%

Red

Figure 20. Calibrating a Pressure-to-Current (P/I) Transmitter

Black

+

SIGNAL

–

TEST

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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.

Calibrating an I/P Device

2. Press

3. Press

4. If necessary, press

5. Enter the desired current by pressing

A (upper display).
V for sourcing current (lower display).

M for SOURCE mode.

keys. Press Y and Z to select different digits.

X and W

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44

MEAS

SOURCE

STORE

SETUP

RECALL

V mA

LOOP

725

V mA

TC RTD

MULTIFUNCTION CALIBRATOR

ZERO

Measure
Pressure
Source mA

Pressure

Module

Hz

C ˚F

˚

100%

25%

25%

0%

Red

Figure 21. Calibrating a Current-to-Pressure (I/P) Transmitter

Black

+

SIGNAL

–

TEST

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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.

Testing an Output Device

725

MULTIFUNCTION CALIBRATOR

2. Press

V for current or dc voltage, or F for

frequency or resistance (lower display).

3. If necessary, press

M for SOURCE mode.

ZERO

V mA

TC RTD

Red

MEAS

SOURCE

STORE
SETUP

RECALL

V mA

LOOP

0 to 1 V dc

Input

Black

Figure 22. Calibrating a Chart Recorder

Hz

C ˚F

˚

100%

25%

25%

0%

sh25f.eps

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Users Manual

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
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 di splay 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

M key. The calibrator will initialize with its

46

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Remote Control Commands

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

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Users Manual

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

S 1 J Pt100 (3926)

No. Thermocouple Type RTD Type

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

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Replacing the Batteries

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-tu rn clockwise.

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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.

Battery and

Compartment

50

Fuse
Compartment

Figure 23. Replacing the Battteries

sh38f.eps

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

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Maintenance

pack the calibrator securely, using the original shipping
container if it is available. Send the equipment postage
paid and ins
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.

ured, to the nearest Service Center. Fluke

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
17 TL75 series test leads 855742 1
18 Test lead, red

Test lead, black
19 725 Product Overview

Manual

20 AC72 alligator clip, red

AC72 alligator clip, black
21 CD ROM, contains User

Manual
22 Input Decal 690948 1
23 Fuse 0.05A/250V 2002234 2

948609 2

688051
68806611

1549644 1

1670641
167065211
1549615 1

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20

19

22

1

21

8

7

3

6

23

Figure 24. Replacement Parts

9

6

17

10

11

2

3

4

5

16

18

12

13

14

15

zi45f.eps

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Accessories

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

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

2

Kg/cm

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.

15 psi and above

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Fluke Model Number Range Type and Media

Table 11. Pressure Modules

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 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

Accessories

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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

Accuracy,

Range Resolution

30 V
(upper
display)

20 V
(lower
display)

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

0.001 V 0.02 % + 2

0.001 V 0.02 % + 2

(% of Reading + Counts)

DC Voltage Source

Accuracy,

Range Resolution

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

(% of Reading + Counts)

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.

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Specifications

DC mA Measurement and Source

Accuracy,

Range Resolution

24 mA 0.001 mA

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

(% of Reading + Counts)

0.02 % + 2

Ohms Measurement

Accuracy ± Ω*

Ohms Range

0 to 400 Ω 0.1 0.15
400 to 1.5 kΩ 0.5 1.0

1.5 to 3.2 kΩ 11.5

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.

4-Wire 2- and 3-Wire

Ohms Source

Excitation Current from

Ohms Range

15 to 400 Ω 0.15 to 0.5 mA 0.15
15 to 400 Ω 0.5 to 2 mA 0.1
400 to 1.5 kΩ 0.05 to 0.8 mA 0.5

1.5 to 3.2 kΩ 0.05 to 0.4 mA 1

Temperature coefficient -10 °C to 18 °C, +28 °C to
55 °C: ± 0.005 % of resistance range per °C

15 to 400 Ω 0.1 Ω
400 to 3.2 kΩ 1 Ω

Measurement Device

Resolution

Accuracy

± 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

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

Resolution

Accuracy

(% of output

frequency)

Temperature, Thermocouples

Type

J -200 to 0 °C

0 to 1200 °C

K -200 to 0 °C

0 to 1370 °C

T -200 to 0 °C

0 to 400 °C

E -200 to 0 °C

0 to 950 °C

R -20 to 0 °C

0 to 500 °C
500 to 1750 °C

S -20 to 0 °C

0 to 500 °C
500 to 1750 °C

Range

Measure and Source

Accuracies (ITS-90)

1.0 °C

0.7 °C

1.2 °C

0.8 °C

1.2 °C

0.8 °C

0.9 °C

0.7 °C

2.5 °C

1.8 °C

1.4 °C

2.5 °C

1.8 °C

1.5 °C

B 600 to 800 °C

800 to 1000 °C
1000 to 1800 °C

L -200 to 0 °C

0 to 900 °C

U -200 to 0 °C

0 to 400 °C

N -200 to 0 °C

0 to 1300 °C

XK -200 to -100 °C

-100 to 800 °C

BP 0 to 800 °C

800 to 2500 °C
Resolution:
J, K, T, E, L, N, U, XK, BP: 0.1 °C, 0.1 °F
B, R, S: 1 °C, 1 °F

2.2 °C

1.8 °C

1.4 °C

0.85 °C

0.7 °C

1.1 °C

0.75 °C

1.5 °C

0.9 °C

0.5 °C

0.6 °C

1.2 °C

2.5 °C

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Specifications

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

Pt500-385 -200 to 500

500 to 630

Pt1000-385 -200 to 100

100 to 630

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.

0.2

0.8

0.3

0.4

0.2

0.2

0.3

1.6

0.6

0.9

0.4

0.5

0.2

0.8

0.3

0.4

0.2

0.2

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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,
cmH

O@20 °C, bar, mbar, kg/cm2, mmHg, inHg

2

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)

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