Fluke 726 Operating Manual

726

Multifunction Process Calibrator

®

September 2005

© 2005 Fluke Corporation. All rights reserved.
All product names are trademarks of their respective companies.

Users Manual

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.

11/99

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

Table of Contents

Title Page

Introduction.................................................................................................................... 1

Contacting Fluke............................................................................................................ 1

Standard Equipment...................................................................................................... 3

Safety Information ......................................................................................................... 3

Symbols.................................................................................................................... 7

Getting Acquainted with the Calibrator.......................................................................... 8

Input and Output Terminals ...................................................................................... 8

Keys.......................................................................................................................... 10

Display...................................................................................................................... 13

Configuration Menus ..................................................................................................... 14

Contrast Adjustment ................................................................................................. 14

Shut Down Mode ...................................................................................................... 15

CJC........................................................................................................................... 15

Celcius and Fahrenheit (°C and °F).......................................................................... 15

Frequency Pulse Output Voltage.............................................................................. 15

Pulse Output Frequency........................................................................................... 15

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HART Resistor ON/OFF.......................................................................................... 16

Getting Started............................................................................................................... 16

Voltage to Voltage Test............................................................................................. 16

Using Measure Mode..................................................................................................... 18

Measuring Electrical Parameters (Upper Display) .................................................... 18

Current Measurement with Loop Power.................................................................... 18

Measuring Electrical Parameters (Lower Display) .................................................... 20

Measuring Temperature............................................................................................ 21

Using Thermocouples........................................................................................... 21

Using Resistance-Temperature Detectors (RTDs)............................................... 24

PRT Custom Curves ................................................................................................. 24

Measuring Pressure .................................................................................................. 27

Zeroing with Absolute Pressure Modules.................................................................. 28

Using Source Mode........................................................................................................ 30

Sourcing 4 to 20 mA.................................................................................................. 30

Simulating a 4- to 20-mA Transmitter........................................................................ 30

Sourcing Other Electrical Parameters....................................................................... 32

Simulating Thermocouples........................................................................................ 34

Simulating RTDs ....................................................................................................... 36

Sourcing Pressure..................................................................................................... 38

Setting 0 % and 100 % Output Parameters ................................................................... 41

% Error Functionality................................................................................................. 41

Stepping and Ramping the Output................................................................................. 41

Manually Stepping the mA Output............................................................................. 42

Auto Ramping the Output.......................................................................................... 42

Storing and Recalling Setups......................................................................................... 42

Store a Setup ............................................................................................................ 42

Recall a Setup........................................................................................................... 43

ii

Contents

Storing and Recalling Data............................................................................................ 43

Storing Data.............................................................................................................. 43

Recall Data ............................................................................................................... 44

Pulse Train Source/Read .............................................................................................. 44

Calibrating a Transmitter ............................................................................................... 45

Calibrating a Pressure Transmitter................................................................................ 47

Calibrating an I/P Device............................................................................................... 49

Pressure Switch Test..................................................................................................... 51

Testing an Output Device.............................................................................................. 51

Remote Control Commands .......................................................................................... 52

HART Functionality...................................................................................................... 52

Maintenance.................................................................................................................. 53

Replacing the Batteries............................................................................................. 53

Cleaning the Calibrator............................................................................................. 54

Service Center Calibration or Repair ........................................................................ 54

Replacement Parts ................................................................................................... 54

Accessories ................................................................................................................... 56

External Fluke Pressure Module Compatibility......................................................... 56

Specifications ................................................................................................................ 59

DC Voltage Measurement and Source ..................................................................... 59

DC mA Measurement and Source............................................................................ 59

Ohms Measurement ................................................................................................. 60

Ohms Source............................................................................................................ 60

Frequency Measurement.......................................................................................... 60

Frequency Source .................................................................................................... 61

Temperature, Thermocouples .................................................................................. 61

RTD Accuracy (Read and Source) (ITS-90) ............................................................. 63

(continued)

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Index

Loop Power Supply ................................................................................................... 64

Pulse Read and Pulse Source .................................................................................. 64

Pressure Measurement............................................................................................. 64

General Specifications .............................................................................................. 65

iv

List of Tables

Table Title Page

1. Summary of Source and Measure Functions ....................................................................... 2

2. International Symbols ........................................................................................................... 7

3. Input/Output Terminals and Connectors............................................................................... 9

4. Key Functions....................................................................................................................... 11

5. Thermocouple Types Accepted............................................................................................ 22

6. RTD Types Accepted............................................................................................................ 25

7. mA Step Values.................................................................................................................... 42

8. Replacement Parts ............................................................................................................... 54

9. Fluke Pressure Module Compatibility ................................................................................... 56

10. Pressure Modules................................................................................................................. 57

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vi

List of Figures

Figure Title Page

1. Standard Equipment............................................................................................................. 6

2. Input/Output Terminals and Connectors............................................................................... 8

3. Keys...................................................................................................................................... 10

4. Elements of a Typical Display .............................................................................................. 13

5. Adjusting the Contrast .......................................................................................................... 14

6. Voltage-to-Voltage Test........................................................................................................ 17

7. Measuring Voltage and Current Output................................................................................ 18

8. Connections for Supplying Loop Power................................................................................ 19

9. Measuring Electrical Parameters.......................................................................................... 20

10. Measuring Temperature with a Thermocouple..................................................................... 23

11. Measuring Temperature with an RTD, Measuring 2-, 3-, and 4-Wire Resistance................ 26

12. Gage and Differential Pressure Modules.............................................................................. 27

13. Connections for Measuring Pressure ................................................................................... 29

14. Connections for Simulating a 4- to 20-mA Transmitter......................................................... 31

15. Electrical Sourcing Connections........................................................................................... 33

16. Connections for Simulating a Thermocouple........................................................................ 35

17. Connection for Simulating a 3- and 4-Wire RTD .................................................................. 37

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18. Connections for Sourcing Pressure ...................................................................................... 40

19. SAVE DATA Menu Showing Measurement Memory Location 3, 1....................................... 44

20. Calibrating a Thermocouple Transmitter............................................................................... 46

21. Calibrating a Pressure-to-Current (P/I) Transmitter .............................................................. 48

22. Calibrating a Current-to-Pressure (I/P) Transmitter .............................................................. 50

23. Calibrating a Chart Recorder ................................................................................................ 52

24. Replacing the Batteries ......................................................................................................... 53

25. Replacement Parts................................................................................................................ 55

viii

Multifunction Process Calibrator

Introduction

The Fluke 726 Multifunction Process Calibrator (referred
to as “the Calibrator”) is a handheld, battery-operated
instrument that measures and sources electrical and
physical parameters. See Table 1.

In addition to the functions in Table 1, the Calibrator also
has the following features and functions:

• A split-screen display. The upper display allows

users to measure volts, current, and pressure only.
The lower display allows the user to measure and
source volts, current, pressure, resistance
temperature detectors, thermocouples, frequency,
and ohms.

• A thermocouple (TC) input/output terminal and

internal isothermal block with automatic reference­junction temperature compensation.

• Stores and recalls setups.

• Manual and automatic stepping and ramping.

• Stores and recalls calibration screens.

• Control the Calibrator remotely from a PC running a

terminal emulator program.

Contacting Fluke

To order accessories, receive operating assistance, or
locate the nearest Fluke distributor or Service Center,
call:

USA: 1-888-44-FLUKE (1-888-443-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: [phone]
Japan: [phone]
Singapore: [phone]
Anywhere in the world: [phone]

USA Service: 1-888-99-FLUKE (1-888-993-5853)
Or, visit Fluke's Web site at www.fluke.com

To register your product, visit register.fluke.com

.

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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 20 V

dc mA 0 to 24 mA 0 to 24 mA

Frequency 2 CPM to 15 kHz 2 CPM to 15 kHz
Resistance 0 Ω to 4000 Ω 5 Ω to 4000 Ω

Thermocouple Types E, J, K, T, B, R, S, L, U, N, C, XK, BP

RTD
(Resistance­Temperature
Detector)

Pressure 29 modules ranging from 1.0 in. H2O to 10,000 psi

Pulse 1-100,000

Freqency Max 10 kHz

Other functions Loop supply, HART resistor, pressure switch test, save screen, step, ramp, memory, cold

junction compensation

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

Pt500 Ω (385)
Pt1000 Ω (385)

Ni120 (672)

CU10

1-10,000
Frequency Range 2 CPM to 10 kHz

2

Multifunction Process Calibrator
Standard Equipment

Standard Equipment

If the Calibrator is damaged or something is missing,
contact the place of purchase immediately. To order
replacement parts, see Table 8. The items listed below
and shown in Figure 1 are included with the Calibrator.

• TL75 test leads

• AC72 alligator clips

• Stackable alligator clip test leads

726 Product Overview

•

•

725/726 CD-ROM

shown in Figure 1)

• 4 AA Batteries (installed)

(not shown in Figure 1)

(contains Users Manual; not

Safety Information

The Calibrator is designed in accordance with CAN/CSA­C22.2 NO. 61010-1-04, UL 61010-1, and ISA 82.02.01

XW Warning

To avoid possible electric shock or personal
injury, use the Calibrator only as specified in
this manual, otherwise the protection
provided by the Calibrator may be impaired.

A Warning identifies conditions and actions that pose
hazard(s) to the user. A Caution identifies conditions and
actions that may damage the Calibrator or the equipment
under test.

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XW Warning

To avoid possible electric shock or personal injury:

• Use the Calibrator only as described in the Users Manual or the protection provided by the Calibrator

may be impaired.

• Do not apply more than the rated voltage, as marked on the Calibrator, between the terminals, or

between any terminal and earth ground (30 V 24 mA max all terminals).

• Before each use, verify the Calibrator’s operation by measuring a known voltage.

• Follow all equipment safety procedures.

• Use the proper terminals, mode, and range for the measuring or sourcing application.

• Never touch the probe to a voltage source when the test leads are plugged into the current terminals.

• Do not use the Calibrator if it is damaged. Before using the Calibrator, inspect the case. Look for cracks

or missing plastic. Pay particular attention to the insulation surrounding the connectors.

• Select the proper function and range for the measurement.

• Make sure the battery door is closed and latched before operating the Calibrator.

• Remove test leads from the Calibrator before opening the battery door.

• Inspect the test leads for damaged insulation or exposed metal. Check test lead continuity. Replace

damaged test leads before using the Calibrator.

• When using the probes, keep your fingers away from the probe contacts. Keep fingers behind the finger

guards on the probes.

• Connect the common test lead before connecting the live test lead. When disconnecting the test leads,

disconnect the live test lead first.

• Do not use the Calibrator if it operates abnormally. Protection may be impaired. When in doubt, have the

Calibrator serviced.

• Do not operate the Calibrator around explosive gas, vapor, or dust.

4

Multifunction Process Calibrator
Safety Information

• When using a pressure module, make sure the process pressure line is shut off and depressurized

before connecting it or disconnecting it from the pressure module.

• Use only 4 AA batteries, properly installed in the Calibrator case, to power the Calibrator.

• Disconnect test leads before changing to another measure or source function.

• When servicing the Calibrator, use only specified replacement parts.

• To avoid false readings, which could lead to possible electric shock or personal injury, replace the

battery as soon as the battery indicator (M) appears.

• Turn off circuit power before connecting the Calibrator mA and COM terminals in the circuit. Place

Calibrator in series with the circuit.

• Do not allow water into the case.

WCaution

To avoid possible damage to the Calibrator or to equipment under test:

• Disconnect the power and discharge all high-voltage capacitors before testing resistance or continuity.

• Use the proper input jacks, function, and range for the measurement or sourcing application.

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Users Manual

Alligator Clips

AC72

Test Lead Set

TL75

Stackable
Test Leads

SOURCE / MEASURE

mA

+

3W

mA

-

4W

C

O

N

F

I

G

S

E

L

E

C

T

I

O

N

S

A

V

E

R

E

C

A

L

L

ENTER

TRIGGER/STOP

30V MAX ALL TERMINALS

COM

FREQ

V

RTD

MEASURE

0

2

%

PULSE

EXIT CONFIG

1

0

0

2

5

%

5

%

%

TC

Return to

Recall

V

TC

mA

Hz
RTD

LOOP

COM

6

Figure 1. Standard Equipment

bec01f.eps

Multifunction Process Calibrator
Safety Information

Symbols

Symbols used on the Calibrator and in this manual are explained in Table 2.

Table 2. International Symbols

B
F

J

f

P

)

7

AC - Alternating current

DC - Direct current

Earth ground

Pressure

Conforms to European Union directives

Conforms to Canadian Standards Association directives.

T

M

W

O

X

Double insulated

Battery

Risk of danger. Important information. See
Manual. Precedes Warning.

Power ON/OFF

Hazardous Voltage. Precedes Warning.

726

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

PRECISION CALIBRATOR

726

ZERO

HART

V mA

TC

3 Seconds

Return to

Return to

Recall

Recal

OPEN/CLOSE

SWITCH

TEST

FREQ

RTD PULSE

EXIT CONFIG

100%

0%

25%

25%

%Error

V mA
LOOP

MEAS

SOURCE

CONFIG

SELECTION

SAVE

RECALL

ENTER

TRIGGER/STOP

8

2

7

6

5

3

4

bec05f.eps

Figure 2. Input/Output Terminals and Connectors

8

Multifunction Process Calibrator
Getting Acquainted with the Calibrator

Table 3. Input/Output Terminals and Connectors

No Name Description

A

B, C

D

E, F

G, H

Pressure module
connector/serial connector

MEASURE V, mA terminals Input terminals for measuring voltage, current, supplying loop power, HART

Thermocouple (TC)
input/output

SOURCE/ MEASURE V,
RTD, Pulse, Hz, Ω terminals

SOURCE/ MEASURE mA
terminals, 3W, 4W

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

resistance, switch test options.

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.

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

Terminals for sourcing and measuring current and performing 3 W and 4 W RTD
measurements. HART resistor option in mA mode.

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Keys

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

10

MEAS

SOURCE

CONFIG

SELECTION

SAVE

RECALL

ENTER

TRIGGER/STOP

%Error

V mA
LOOP

V mA

PRECISION CALIBRATOR

726

ZERO

3 Seconds

HART

TC

RTD PULSE

Return to

Recallurn to

Recal

OPEN/CLOSE

SWITCH

TEST

FREQ

EXIT CONFIG

100%

0%

6

7

8

25%

25%

9

10

11

bec41f.eps

PRECISION CALIBRATOR

726

3

20

19

2

ZERO

HART

V mA

TC

3 Seconds

Return to

Recal

OPEN/CLOSE

SWITCH

TEST

FREQ

RTD PULSE

EXIT CONFIG

100%

0%

25%

25%

%Error

V mA
LOOP

MEAS

SOURCE

1

CONFIG

SELECTION

SAVE

RECALL

ENTER

TRIGGER/STOP

4

18

17

5

16

15

14

13

12

Figure 3. Keys

Multifunction Process Calibrator
Getting Acquainted with the Calibrator

Table 4. Key Functions

No Name Description

A O
B

C

%Error

l

ZERO

3 Seconds

A

OPEN/CLOSE

D

Q

E C
F

K

G P

EXIT CONFIG

H

I
J

K

11

G
H

I

J

Turns the power on or off.

Toggles voltage, mA, or Loop Power and % Error measurement functions in the upper display.

Selects the pressure measurement function in the upper display. Repeated pushes cycle through the
different pressure units. Zeros pressure when held for 3 seconds.

Activates the switch test.

Turns backlight on or off.
Selects frequency sourcing or measurement.
Selects pulse sourcing or measurement.
Recalls a source value from memory corresponding to 100 % of span and sets it as the source value.

Press and hold to store the source value as the 100 % value.
Exits Configuration Menu.

Increments output by 25 % of span.

Decrements output by 25 % of span.

Recalls from memory a source value corresponding to 0 % of span and sets it as the source value.
Press and hold to store the source value as the 0 % value.
Press and hold when powering up to identify the firmware version. The firmware version is shown in the
upper display for about 1 second after initialization.

726

Users Manual

Table 4. Key Functions (cont.)

No Name Description

Cycles through :

L

M

N

O

TRIGGER/STOP

L

XW Y Z

Return to

Recall

S

ENTER

C

E Slow repeating 0 % - 100 % - 0 % ramp
P Fast repeating 0 % - 100 % - 0 % ramp
N Repeating 0 % - 100 % - 0 % ramp in 25 % steps

Used for the pulse train and totalizer functions.
Increases or decreases the source level.
Cycles through the 2-, 3-, and 4-wire selections.
Moves through the memory locations of Calibrator setups.
Moves through the configuration menus.

Saves and recalls setups & data.
ENTER is used in the configuration menus.

Used to enter and navigate the configuration menus.

P

M

Q T

R

V

S R

T U

12

HART

Cycles the Calibrator through MEASURE and SOURCE modes in the lower display.

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.
Inserts a 250 Ω resistor when in mA.

Selects RTD (resistance temperature detector) measurement and sourcing function in lower
display. Repeated pushes cycle through the RTD types. Selects resistance mode.

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

Multifunction Process Calibrator
Getting Acquainted with the Calibrator

Display

Figure 4 shows the elements of a typical display.

Loop

Indicator

Memory Locations

for Calibrator Setups

HART Mode

Indicator

Low Battery

Symbol

Units

Mode

Display

Indicator

% Error
Indicators

Auto
Ramp

bec07f.eps

Figure 4. Elements of a Typical Display

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Configuration Menus

Use the configuration menus to set or change these
parameters of the Calibrator:

• Contrast Adjustment

• Shut Down Mode

• CJC on/off

• °C/°F

• Frequency/Pulse output voltage

• Pulse output frequency

• HART resistor on/off

To enter the configuration menus, press C. Press
S, to save new configuration. Press G/

CONFIG

to exit configuration.

Configuration menus are explained below.

Contrast Adjustment

To adjust the contrast (see Figure 5):

1. Press C until Contst Adjust appears on the
display.

2. Use X and W to adjust the contrast up and down.

3. Press S to save the setting.

EXIT

PRECISION CALIBRATOR

726

ZERO

HART

V mA

TC

3 Seconds

Return to

Return to

Recall

Recal

OPEN/CLOSE

SWITCH

RTD PULSE

%Error

V mA
LOOP

MEAS

SOURCE

CONFIG

SELECTION

SAVE

RECALL

ENTER

1

TRIGGER/STOP

3

Figure 5. Adjusting the Contrast

TEST

FREQ

EXIT CONFIG

100%

25%

0%

2

25%

bec06f.eps

14

Multifunction Process Calibrator
Configuration Menus

Shut Down Mode

The Calibrator comes with a shut down mode set for 30
minutes (displayed for about 1 second when the
Calibrator is initially turned on). When shut down mode is
enabled, the Calibrator automatically shuts down after
the elapsed time from when the last key was pressed.

1. Press C until SHUT DOWN appears on the
display.

2. Use X and W to increase or decrease the time.

3. Press S to save the setting.

CJC

Cold Junction Compensation (CJC) is a value for the cold
end of a thermocouple at the Meter’s end.

1. Press C until SELECT CJC appears on the
display.

2. Use

3. Press S to save the setting.

Y and Z to select ON or OFF.

Celcius and Fahrenheit (°C and °F)

1. Press C until SELECT UNIT °C (or °F) appears
on the display.

2. Use X and W to select °C or °F.

3. Press S to save the setting.

Frequency Pulse Output Voltage

1. Press C until FREQ OUTPUT V Adjust appears
on the display.

2. Use X, W,
output voltage from 1 to 20 V.

3. Press S to save the setting.

Y and Z to adjust the frequency pulse

Pulse Output Frequency

1. Press C until PULSE OUTPUT Hz FREQ Adjust
appears on the display.

2. Use X, W,
frequency from 2 CPM to 15 kHz.

3. Press S to save the setting.

Y and Z to adjust the pulse output

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

HART

1. Press C until SELECT HART ON or OFF

2. Use V to toggle ON or OFF.

3. Press S to save the setting.

Resistor ON/OFF

appears on the display.

Note

When HART mode is selected, the 250 Ω
resistor is turned on both mA channels.

Getting Started

This section details some basic operations of the
Calibrator.

Voltage to Voltage Test

To perform a voltage-to-voltage test:

1. Connect the Calibrator’s voltage output to its voltage
input as shown in Figure 6.

2. Press

3. If necessary, press

4. Press

5. Press Y and Z to select a digit to change. Press X

6. Press X to increase the output to 5 V. Press and

7. Press

O to turn on the Calibrator. Press l to

select dc voltage (upper display).

M for SOURCE mode (lower

display). The Calibrator is still measuring dc voltage,
the active measurements are visible in the upper
display.

V to select dc voltage sourcing.

to select 1 V for the output value. Press and hold

J

to enter 1 V as the 0 % value.

G to enter 5 V as the 100 % value.

hold

H and I to step between 0 and 100 %

in 25 % step increments.

16

Multifunction Process Calibrator
Getting Started

726

PRECISION CALIBRATOR

ZERO

%Error

3

S

e

c

o

n

d

s

OPEN/CLOSE

V

m

A

S

L

W

O

IT

O

C

P

H

T

E

S

T

HART

V m

M

E

A

S

A

FRE

Q

RTD

PULSE

EXIT CONFIG

1

0

0

%

2

5

%

2

5

%

0

%

C

S

E

S

R

E

C

ENTER

TRIGGER/STOP

SOURCE

O

N

L

E

C

A

V
A

TC

F

I

G

T

I

O

N

E
L

L

bec39f.eps

Figure 6. Voltage-to-Voltage Test

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Users Manual

Using Measure Mode

Measuring Electrical Parameters (Upper Display)

To measure the current or voltage output of a transmitter,
or to measure the output of a 700 Series pressure
module, use the upper display and proceed as follows:

1. Press

2. Connect the leads as shown in Figure 7.

Current Measurement with Loop Power

The loop power function activates a 24 V supply in series
with the current measuring circuit, allowing you to test a
transmitter when it is disconnected from plant wiring. To
measure current with loop power:

1. Connect the Calibrator to the transmitter current loop

2. Press

l to select volts or current. LOOP should

not be on.

terminals as shown in Figure 8.

l while the Calibrator is in current

measurement mode. LOOP appears and an internal
24 V loop supply turns on.

Note

When HART resistor mode is selected, the

Ω

resistor is turned on both mA channels.

250

Figure 7. Measuring Voltage and Current Output

bec42f.eps

18

Multifunction Process Calibrator
Using Measure Mode

PRECISION CALIBRATOR

726

ZERO

HART

V mA

TC

3 Seconds

Return to

Recall

OPEN/CLOSE

SWITCH

TEST

FREQ

RTD PULSE

EXIT CONFIG

100%

25%

0%

TEST DC PWR

+–+–

25%

–+

MEAS

SOURCE

CONFIG

SELECTION

SAVE

RECALL

ENTER

TRIGGER/STOP

%Error

V mA
LOOP

HART

Communicator

Red

Black

bec18f.eps

Figure 8. Connections for Supplying Loop Power

19

726

Users Manual

Measuring Electrical Parameters (Lower Display)

To measure electrical parameters using the lower display,
proceed as follows:

1. Connect the Calibrator as shown in Figure 9.

2. If necessary, press
display).

3. Press

V for dc voltage or current, K for

frequency, and Rfor resistance.

M for MEASURE mode (lower

Red

Black

MEAS

SOURCE

CONFIG

SELECTION

SAVE

RECALL

ENTER

TRIGGER/STOP

%Error

V mA
LOOP

726

HART

V mA

TC

PRECISION CALIBRATOR

ZERO

OPEN/CLOSE

3 Seconds

SWITCH

TEST

RTD PULSE

EXIT CONFIG

Return to

Recal

FREQ

100%

25%

25%

0%

20

Figure 9. Measuring Electrical Parameters

bec43f.eps

Multifunction Process Calibrator
Using Measure Mode

Measuring Temperature

Using Thermocouples

The Calibrator supports 13 standard thermocouples.
Table 5 summarizes the ranges and characteristics of
each.

To measure temperature using a thermocouple:

1. Select Celsius or Fahrenheit, depending on the
desired measurement. Refer to “Configuration
Menus” for more information.

2. Attach the thermocouple leads to the appropriate TC
miniplug, then to the TC input/output as shown in
Figure 10.

W Caution

One pin is wider than the other. Do not try to force a
miniplug into the wrong polarization.

Note

If the Calibrator and the thermocouple plug are at
different temperatures, wait one minute or more
for the connector temperature to stabilize after
plugging the miniplug into the TC input/output.

3. If necessary, press M for MEASURE mode.

4. Press

T for the thermocouple display. Continue

pressing this key to select the desired thermocouple
type.

21

726

Users Manual

Table 5. Thermocouple Types Accepted

Type

E Chromel Purple Violet Constantan -200 to 950
N Ni-Cr-Si Orange Pink Ni-Si-Mg -200 to 1300

J Iron White Black Constantan -200 to 1200
K Chromel Yellow Green Alumel -200 to 1370
T Copper Blue Brown Constantan -200 to 400
B Platinum (30 % Rhodium) Gray Platinum (6 % Rhodium) 600 to 1800
R Platinum (13 % Rhodium) Black Orange Platinum -20 to 1750
S Platinum (10 % Rhodium) Black Orange Platinum -20 to 1750
L Iron Constantan -200 to 900
U Copper Constantan -200 to 400

C

BP 90.5 % Ni + 9.5 % Cr

XK 95 % W + 5 % Re Red or Pink 80 % W + 20 % Re 0 to 2500

*American National Standards Institute (ANSI) device negative lead (L) is always red.
**International Electrotechnical Commission (IEC) device negative lead (L) is always white.

Tungsten 5% Rhenium White None Tungsten 26% Rhenium 0 to 2316

Positive Lead

Material

Positive Lead (H)

Color

ANSI* IEC**

GOST

Violet or Black

Negative Lead

Material (°C)

56 % Cu + 44 % Ni -200 to 800

Specified Range

22

Multifunction Process Calibrator
Using Measure Mode

30V MAX ALL TERMINALS

SOURCE / MEASURE

+

mA

3W

-

mA
4W

V
Hz

RTD

COM COM

MEASURE

V

TC

mA

LOOP

TC

Process Temperature

Warning

TC Miniplug

30 V maximum to

Figure 10. Measuring Temperature with a Thermocouple

23

bec12f.eps

726

Users Manual

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
common R
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.

is 100 Ω. The Calibrator accepts RTD

0

. The most

0

To measure temperature using an RTD input:

1. If necessary, press

2. Press

3. Press

4. Attach the RTD to input terminals as shown in

R for the RTD display. Continue pressing

this key to select the desired RTD type.

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

connection.

Figure 11.

M for MEASURE mode.

PRT Custom Curves

Up to three custom curves can be named and CVD
coefficients can be entered through the serial port. Names
can be up to six characters. For more information, see
the Application Note on the 725/726 CD.

24

Multifunction Process Calibrator
Using Measure Mode

Table 6. RTD Types Accepted

RTD Type Ice Point (R

) Material α Range (°C)

0

Pt100 (3926) 100 Ω Platinum 0.003926 Ω/°C -200 to 630
Pt100 (385) 100 Ω Platinum 0.00385 Ω/°C -200 to 800
Ni120 (672) 120 Ω Nickel 0.00672 Ω/°C -80 to 260
Pt200 (385) 200 Ω Platinum 0.00385 Ω/°C -200 to 630
Pt500 (385) 500 Ω Platinum 0.00385 Ω/°C -200 to 630
Pt1000 (385) 1000 Ω Platinum 0.00385 Ω/°C -200 to 630
Pt100 (3916) 100 Ω Platinum 0.003916 Ω/°C -200 to 630

The IEC standard RTD commonly used in U.S. industrial applications is the Pt100 (385), α = 0.00385 Ω/°C.
Pt100 (3916), α = 0.003916 Ω/°C is also designated as JIS curve.

Custom RTDs may also be added, see PRT Custom Curves

25

726

Users Manual

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

LOOP

mA

MEASURE

V

MEASURE

V

MEASURE

V

RTD

RTD

RTD

26

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

bec15f.eps

Multifunction Process Calibrator
Using Measure Mode

Measuring Pressure

Many ranges and types of pressure modules are available
from Fluke, see “Accessories”. Before using a pressure
module, read its instruction sheet. The modules vary in
use, media, and accuracy.

Figure 12 shows the gage and differential modules.
Differential modules also work in gage mode by leaving
the low fitting open to atmosphere.

To measure pressure, attach the appropriate pressure
module for the process pressure to be tested, and
proceed as follows:

W Warning

To avoid a violent release of pressure in a
pressurized system, shut off the valve and
slowly bleed off the pressure before attaching
the pressure module to the pressure line.

Figure 12. Gage and Differential Pressure Modules

To avoid mechanically damaging the
pressure module:

• Never apply more than 10 ft.-lb. (13.5 Nm)

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

WCaution

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.

gj11f.eps

27

726

Users Manual

• Never apply pressure above the rated

maximum printed on the pressure
module.

• Only use the pressure module with

specified materials. Refer to the printing
on the pressure module or the pressure
module instruction sheet for the
acceptable material compatibility.

1. Connect a pressure module to the Calibrator as
shown in Figure 13. The threads on the pressure
modules accept standard ¼ NPT pipe fittings. Use
the supplied ¼ NPT to ¼ ISO adapter if necessary.

2. Press either

A or a. The Calibrator

automatically senses which pressure module is
attached and sets its range accordingly.

3. Zero the pressure module as described in the
module’s Instruction Sheet. Modules vary in zeroing
procedures depending on module type, but all require
pressing

Continue pressing
units to psi, mmHg, inHg, cmH
°C, inH
bar, kg/cm

A for 3 seconds.

A to change pressure display

O@4 °C, cmH2O@20

O@4 °C, inH2O@20 °C, inH2O@60 °F, mbar,

2

2

, or kPa.

2

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

2. Use X to increase or W to decrease the Calibrator

3. Press
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.

A, REF Adjust appears to the right of the

pressure reading.

reading to equal the reference pressure.

A again to exit the zeroing procedure.

28

Multifunction Process Calibrator
Using Measure Mode

Isolation

Valve

Gage

Module

PRECISION CALIBRATOR

726

ZERO

HART

V mA

TC

3 Seconds

Return to

Recall

OPEN/CLOSE

SWITCH

TEST

FREQ

RTD PULSE

EXIT CONFIG

100%

0%

Differential

25%

25%

Module

HL

Tank

MEAS

SOURCE

CONFIG

SELECTION

SAVE

RECALL

ENTER

TRIGGER/STOP

%Error

V mA
LOOP

bec37f.eps

Figure 13. Connections for Measuring Pressure

29

726

Users Manual

Using Source Mode

In SOURCE mode, the Calibrator:

• generates calibrated signals for testing and
calibrating process instruments

• supplies voltages, currents, frequencies, and
resistances

• simulates the electrical output of RTD and
thermocouple temperature sensors

• measures gas pressure from an external source,
creating a calibrated pressure source.

Sourcing 4 to 20 mA

To select the current sourcing mode, proceed as follows:

1. Connect the test leads in the mA terminals (left
column).

2. If necessary, press

3. Press

V for current and enter the desired current

by pressing X,W,

M for SOURCE mode.

Y, and Z.

Simulating a 4- to 20-mA Transmitter

Simulate is a special mode of operation in which the
Calibrator is connected into a loop in place of a
transmitter and supplies a known, settable test current.
Proceed as follows:

1. Connect the 24 V loop power source as shown in
Figure 14.

2. If necessary, press

3. Press

4. Enter the desired current by pressing X,W,

V until both mA and SIM display.

M for SOURCE mode.

Y, and

Z.

30

Multifunction Process Calibrator
Using Source Mode

PRECISION CALIBRATOR

726

ZERO

HART

V mA

TC

3 Seconds

Return to

Recall

OPEN/CLOSE

SWITCH

TEST

FREQ

RTD PULSE

EXIT CONFIG

100%

0%

25%

25%

%Error

V mA
LOOP

MEAS

Red

+

+24 V

SOURCE

CONFIG

SELECTION

SAVE

RECALL

ENTER

TRIGGER/STOP

Loop
Power
Supply

Black

Readout or

Controller

–

bec17f.eps

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

31

726

Users Manual

Sourcing Other Electrical Parameters

Volts, ohms, and frequency are also sourced and shown
in the lower display.

To select an electrical sourcing function, proceed as
follows:

1. Connect the test leads as shown in Figure 15,
depending on the source function.

2. If necessary, press

Mfor SOURCE mode.

3. Press V for dc voltage, or K for frequency, and

R for resistance.

4. Enter the desired output value by pressing

X and

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

change.

32

Multifunction Process Calibrator
Using Source Mode

mA

30V MAX ALL TERMINALS

SOURCE / MEASURE

+ mA

+

mA

Red

+

HART

–

Communicator

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

bec16f.eps

Figure 15. Electrical Sourcing Connections

33

726

Users Manual

Simulating Thermocouples

Connect the Calibrator TC input/output to the instrument
under test with the thermocouple wire and the appropriate
thermocouple mini-connector (polarized thermocouple
plug with flat, in-line blades spaced 7.9 mm [0.312 in]
center to center).

One pin is wider than the other.

W Caution

Do not try to force a miniplug into the wrong
polarization.

Figure 16 shows this connection. Proceed as follows to
simulate a thermocouple:

1. Attach the thermocouple leads to the appropriate TC
miniplug, then to the TC input/output as shown in
Figure 16.

2. If necessary, press

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.

34

Multifunction Process Calibrator
Using Source Mode

PRECISION CALIBRATOR

726

TEST DC PWR

++–

–+

MEAS

SOURCE

CONFIG

SELECTION

SAVE

RECALL

ENTER

TRIGGER/STOP

%Error

V mA
LOOP

HART

V mA

TC

ZERO

3 Seconds

Return to

Recall

OPEN/CLOSE

SWITCH

TEST

FREQ

RTD PULSE

EXIT CONFIG

100%

25%

0%

Color depends

on type of TC

25%

TC Miniplug

Figure 16. Connections for Simulating a Thermocouple

bec20f.eps

35

726

Users Manual

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.

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.

M for SOURCE mode.

Note

3. Enter the desired temperature by pressing X and

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

4. If the 726 display indicates ExI HI, the excitation
current from your device under test exceeds the
limits of the 726.

36

Multifunction Process Calibrator
Using Source Mode

726

PRECISION CALIBRATOR

RED

1

2

SOURCE

C

S

E

L

S

A

R

E

C

ENTER

TRIGGER/STOP

ZERO

%Error

3

S

e

c

o

n

d

s

OPEN/CLOSE

V

m

A

S

L

W

O

IT

O

C

P

H

T

E

S

T

HART

V m

M

E

A

S

A

F

R

EQ

TC

O

N

F

I

G

E

C

T

I

O

N

V

E

A

L

L

Return to

Recall

R

TD

P

U

LS

E

EXIT CONFIG

1

0

0

%

2

5

%

2

5

%

0

%

SENSOR

TERMINALS

4

3

BLACK

bec40f.eps

Figure 17. Connections for Simulating 3- and 4-Wire RTD

37

726

Users Manual

Sourcing Pressure

The Calibrator sources pressure by measuring pressure
supplied by a pump or other sources, and displaying the
pressure in the SOURCE field. Figure 18 shows how to
connect a pump to a Fluke pressure module which makes
it a calibrated source.

Many ranges and types of pressure modules are available
from Fluke, see “Accessories”. Before using a pressure
module, read its instruction sheet. The modules vary in
use, media, and accuracy.

Attach the appropriate pressure module for the process
pressure to be tested.

Proceed as follows to source pressure:

WWarning

To avoid a violent release of pressure in a
pressurized system, shut off the valve and
slowly bleed off the pressure before attaching
the pressure module to the pressure line.

WCaution

To avoid mechanically damaging the
pressure module:

• Never apply more than 10 ft.-lb. (13.5 Nm)

of torque between the pressure module
fittings, or between the fittings and the
body of the module. Always apply
appropriate torque between the pressure
module fitting and connecting fittings or
adapters.

• Never apply pressure above the rated

maximum printed on the pressure
module.

• Use the pressure module only with

specified materials. Refer to the printing
on the pressure module or the pressure
module instruction sheet for the
acceptable material compatibility.

38

Multifunction Process Calibrator
Using Source Mode

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,

O@4 °C, cmH2O@20 °C, inH2O@4 °C,

cmH

2

O@20 °C, inH2O@60 °C, mbar, bar, kg/cm2, or

inH

2

kPa.

39

726

Users Manual

%Error

V mA
LOOP

MEAS

SOURCE

CONFIG

SELECTION

SAVE

RECALL

ENTER

TRIGGER/STOP

PRECISION CALIBRATOR

726

ZERO

3 Seconds

HART

V mA

TC

Return to

Recall

OPEN/CLOSE

SWITCH

TEST

FREQ

RTD PULSE

EXIT CONFIG

100%

0%

0%

Hand Pump

Measure mA
Source Pressure
24 V Loop Power
Enabled

Pressure

Module

To Unit Under Test

25%

25%

40

Figure 18. Connections for Sourcing Pressure

bec47f.eps

Multifunction Process Calibrator
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, 0 % and 100 % points must
be set before using 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. This example is temperature
source using 100 °C and 300 °C values for source.

3. Enter 100 °C then press and hold
value.

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

This setting can now be used for the following:

• Manually stepping an output in 25 %

increments.

• Switch between the 0 and 100 % span points by

momentarily pushing

M for SOURCE mode.

J to store the

G to store the

J or G.

% Error Functionality

Percentage Error is available for every range on the
lower display. The calculation is based on a mA
percentage deviation
upper display to the value sourced on the lower display
0 % mA and 100 % mA are fixed to 4 and 20 mA. 0 %
and 100 % for the lower display are set in source using
J and G, refer to “Setting 0% and 100% Output
Parameters”.

from the value measured on the

Stepping and Ramping the Output

Two additional 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 use of an external pressure
source.

H and I

41

726

Users Manual

Manually Stepping the mA Output

To manually step current output:

• Use

• Touch 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 %.

Auto Ramping the Output

Auto ramping can continuously apply a varying stimulus
from the Calibrator to a transmitter, while your hands
remain free to test the response of the transmitter.

L is pressed, the Calibrator produces a

When
repeating 0 % - 100 % - 0 % ramp in a choice of three
ramp waveforms:

E 0 % - 100 % - 0 % 40-second smooth ramp

•

•

P 0 % - 100 % - 0 % 15-second smooth ramp

•

N 0 % - 100 % - 0 % Stair-step ramp in 25 %

steps, pausing 5 seconds at each step. Steps are
listed in Table 7.

To exit ramping, press any button.

Table 7. mA Step Values

Step 4 to 20 mA

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

Storing and Recalling Setups

Up to eight settings can be stored in a nonvolatile
memory to recall for later use. A low battery condition or
a battery change does not jeopardize the stored settings.

Store a Setup

To store a setup:

1. Create the desired setup.

2. Push S. The right side of the display changes to
show SAVE SETUP and SAVE DATA.

3. Push Sto select SAVE SETUP.

4. Push Y or Z to select the desired memory location (at
the top of the LCD).

5. Push S to enter the setup.

42

Multifunction Process Calibrator
Storing and Recalling Data

Recall a Setup

To recall a setup:

1. Push S twice. The right side of the display
changes to show RECL SETUP and RECALL DATA.

2. Push S again to RECL SETUP.

3. Push Z to select the desired memory location (at the
top of the LCD).

4. Push S to recall the setup from the proper
memory location.

Storing and Recalling Data

Up to 40 data samples can be stored in a nonvolatile
memory to be recalled for later use. A low battery
condition or a battery change does not jeopardize the
stored settings.

Storing Data

To store measurement data, use the following procedure,
refer to Figure 19.

1. Take the desired measurement.

2. Push S. The right side of the display changes to
show SAVE SETUP and SAVE DATA.

3. Press W to select SAVE DATA.

4. Push S again. The open data point (bottom right
of the display) flashes.

5. Use Y and Z to change the data point location (1-8).

6. Push S to store the measurement and return the
unit to the measurement mode. Figure 19 shows a
reading stored in memory location 3, data point 1.

43

726

Users Manual

Memory Locations

Save Data Mode Indicator

Data Point

S A V E
D A T A

1

bec46f.eps

Figure 19. SAVE DATA Menu Showing Measurement

Memory Location 3, 1

Recall Data

To recall data:

1. Push S twice. The right side of the display
changes to show RECL SETUP and RECALL DATA.

2. Push W to highlight RECL DATA (bottom right of the
display).

3. Push S.

4. Push Z to choose the desired memory location (top
of the display).

The data saved in that first memory location now
appears. There can be different measurements
stored (1-5) for each memory location (1-8).

5. Push Y or Z to select the correct data location
(bottom right of display).

6. Push S to recall the data stored in that location.

7. Push W to return to the same RECALL DATA
location to see the next saved measurement, 2 of 5
for example.

Pulse Train Source/Read

Pulse Train Source/Read counts input pulses or sources
output pulses. Use the configuration menus to set the
frequency and output voltage. Refer to “Configuration
Menus” earlier in this manual. The number of counts is
set through the main display and cannot be changed
while sourcing pulses.

L works as a trigger/stop key

in this mode since ramping or stepping during a pulse
train is not relevant.

44

Multifunction Process Calibrator
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. Use the following steps to calibrate a
transmitter:

1. Connect the Calibrator to the instrument under test
as shown in Figure 20.

2. Press

3. 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.

4. If necessary, press

5. Set the zero and span parameters by pressing

W. Enter these parameters by pressing and

and
holding
setting parameters, see “Setting 0 % and 100 %
Output Parameters”.

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

When HART resistor mode is selected, the
250

J and G. For more information on

H or I. Adjust the transmitter as

Ω

resistor is turned on both mA channels.

M for SOURCE mode.

X

Note

45

726

Users Manual

%Error

V mA
LOOP

MEAS

SOURCE

CONFIG

SELECTION

SAVE

RECALL

ENTER

TRIGGER/STOP

PRECISION CALIBRATOR

726

ZERO

3 Seconds

HART

V mA

TC

Return to

Recall

OPEN/CLOSE

SWITCH

TEST

FREQ

RTD PULSE

EXIT CONFIG

100%

25%

0%

Red

TEST DC PWR

+–+–

25%

–+

HART

Communicator

Black

46

Figure 20. Calibrating a Thermocouple Transmitter

bec44f.eps

Multifunction Process Calibrator
Calibrating a Pressure Transmitter

Calibrating a Pressure Transmitter

The following steps explain calibrating a pressure
transmitter.

1. Connect the Calibrator to the instrument under test
as shown in Figure 21.

2. Press

3. Press

l for current (upper display). If required,

l again to activate loop power.

press

U (lower display).

4. If necessary, press M for SOURCE mode.

5. Zero the pressure module.

6. Perform checks at 0 % and 100 % of span and
adjust the transmitter as necessary.

Note

When HART resistor mode is selected, the

Ω

resistor is turned on both mA channels.

250

47

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Users Manual

Hand Pump

48

MEAS

SOURCE

CONFIG

SELECTION

SAVE

RECALL

ENTER

TRIGGER/STOP

%Error

V mA
LOOP

726

HART

V mA

TC

PRECISION CALIBRATOR

ZERO

OPEN/CLOSE

3 Seconds

SWITCH

TEST

RTD PULSE

Return to

Recall

Measure mA
Source Pressure
24 V Loop Power
Enabled

Pressure

Module

FREQ

EXIT CONFIG

100%

25%

25%

0%

0%

Red

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

SIGNAL

+

TEST

HART

Communicator

–

Black

bec34f.eps

Multifunction Process Calibrator
Calibrating an I/P Device

Calibrating an I/P Device

The following steps explain how to calibrate a device that
controls pressure. Proceed as follows:

1. Connect the test leads to the instrument under test as
shown in Figure 22. The connections simulate a
current-to-pressure transmitter and measures the
corresponding output pressure.

2. Press

A (upper display).

3. Press V for sourcing current (lower display).

4. If necessary, press

5. Enter the desired current by pressing

Y and Z to select different digits.

Press

M for SOURCE mode.

X and W.

49

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Users Manual

50

MEAS

SOURCE

CONFIG

SELECTION

SAVE

RECALL

ENTER

TRIGGER/STOP

%Error

V mA
LOOP

HART

V mA

726

TC

PRECISION CALIBRATOR

ZERO

OPEN/CLOSE

3 Seconds

SWITCH

TEST

RTD PULSE

EXIT CONFIG

Return to

Recall

Measure
Pressure
Source mA

Pressure

Module

FREQ

100%

25%

25%

0%

0%

Red

Figure 22. Calibrating a Current-to-Pressure (I/P) Transmitter

SIGNAL

+

TEST

HART

Communicator

–

Black

bec28f.eps

Pressure Switch Test

Multifunction Process Calibrator

Pressure Switch Test

Note

This example uses a normally-closed switch.
The procedure is the same for an open switch
but the display reads OPEN instead of CLOSE.

To perform a switch test:

1. Connect the Calibrator mA and COM terminals to the
switch using the pressure switch terminals and
connect the pump to the pressure switch. The
polarity of the terminals does not matter.

2. Make sure the vent on the pump is open and, if
necessary, zero the Calibrator. Close the vent after
zeroing the Calibrator.

3. Press Q to enter switch-test mode. The upper
display indicates the applied pressure. CLOSE is
displayed to the right of the pressure reading to
indicate closed contacts.

4. Slowly apply pressure with the pump until the switch
opens.

Note

Pressure the device slowly to ensure accurate
readings. Run the test several times to confirm
repeatability.

OPEN displays once the switch is open. Slowly bleed the
pump until the pressure switch closes. RECALL appears
on the display.

5. Press Q to read the pressure values for when the
switch opened, for when it closed, and for the
deadband.

6. Hold Q for three seconds to restart the test. Press
A OR U to exit the switch test.

Testing an Output Device

Use the source functions to test and calibrate actuators,
recording, and indicating devices. Proceed as follows:

1. Connect the test leads to the instrument under test
as shown in Figure 23.

2. Press V for current or dc voltage, or K for
frequency or resistance (lower display).

3. If necessary, press

M for SOURCE mode.

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Remote Control Commands

The Calibrator may be remotely controlled from a PC
running a terminal emulator program. The remote control
commands give access to all capabilities of the Calibrator
with the exception of pressure measurement.

See the Fluke Web Site for the 726 Remote
Programming application note at

www.fluke.com/processtools

HART Functionality

The Calibrator has a user-selectable 250 Ω HART to
facilitate use with HART
resistor can be switched in or out using config selection
menus. Use a HART communicator when measuring mA
with loop power or sourcing mA.

communication devices. The

52

Figure 23. Calibrating a Chart Recorder

bec25f.eps

Maintenance

Multifunction Process Calibrator

Maintenance

Replacing the Batteries

XWWarning

To avoid false readings, which could lead to
possible electric shock or personal injury,
replace the batteries as soon as the battery
indicator (M) appears.

Figure 24 shows you how to replace the batteries.

Battery and

Compartment

Figure 24. Replacing the Batteries

bec38f.eps

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Cleaning the Calibrator

WCaution

To avoid damaging the plastic lens and case,
do not use solvents or abrasive cleansers.

Clean the Calibrator and pressure modules with a soft
cloth dampened with water or water and mild soap.

Service Center Calibration or Repair

Calibration, repairs, or servicing not covered in this
manual should be performed only by qualified service
personnel. If the Calibrator fails, check the batteries first,
and replace them if needed.

To locate an authorized service center, refer to
“Contacting Fluke” at the beginning of the manual.

Replacement Parts

Table 8 lists the part number of each replaceable part.
Refer to Figure 25.

Table 8. Replacement Parts

Item Description PN Qty.

1 AA alkaline batteries 376756 4
2 Case screws 832246 4
3 Battery door 664250 1
4 Accessory mount 658424 1
5 Tilt stand 659026 1
6 Battery door 1/4-turn

fasteners

7 TL75 series test leads
8 Test lead, red

Test lead, black

9

726 Product Overview
Manual

10 AC72 alligator clip, red

AC72 alligator clip, black

11

725/726 CD ROM

contains User Manual

,

948609 2

855742 1
688051
688066 1 1

2441588 1

1670641
1670652 1 1
1549615 1

54

Multifunction Process Calibrator

Maintenance

1

2

10

3

6

7

4

5

9

11

8

bec45f.eps

Figure 25. Replacement Parts

55

726

Users Manual

Accessories

For more information about these accessories, contact
your Fluke representative. Fluke Pressure Module
Compatibility is listed in Table 9. Pressure Modules and
Fluke model numbers are listed in Table 10. Contact your
Fluke representative about new pressure modules not
listed here.

• 700HTP 0 to 10,000 PSI Pump

• 700PTP -11.6 to 360 PSI Pump

• 700TC1 and 700TC2 Thermocouple Mini-plug Kits

Table 9. Fluke Pressure Module Compatibility

Pressure Unit Module Compatibility

Psi Available on all pressure ranges
In. H20 All ranges through 3000 psi
cm. H20 All ranges through 1000 psi
Bar 15 psi and above
Mbar All ranges through 1000 psi
KPa Available on all pressure ranges
In.Hg. Available on all pressure ranges
mm. Hg All ranges through 1000 psi
Kg/cm2 15 psi and above

External Fluke Pressure Module Compatibility

The output of Fluke 700P pressure modules can cause
the 726’s 5 digit display to overflow, or else produce
values that are too low to be read if inappropriate units
are selected. This is prevented by displaying OL on the
display per the following table.

56

Multifunction Process Calibrator

Accessories

Table 10. Pressure Modules

Fluke Model Number Range Type and Media

Fluke-700P00 0 to 1” H2O differential, dry
Fluke-700P01 0 to 10” H2O differential, dry
Fluke-700P02 0 to 1 psi differential, dry
Fluke-700P22 0 to 1 psi differential, wet
Fluke-700P03 0 to 5 psi differential, dry
Fluke-700P23 0 to 5 psi differential, wet
Fluke-700P04 0 to 15 psi differential, dry
Fluke-700P24 0 to 15 psi differential, wet
Fluke-700P05 0 to 30 psi gage, wet
Fluke-700P06 0 to 100 psi gage, wet
Fluke-700P27 0 to 300 psi gage, wet
Fluke-700P07 0 to 500 psi gage, wet
Fluke-700P08 0 to 1,000 psi gage, wet
Fluke-700P09 0 to 1,500 psi gage, wet

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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

Table 10. Pressure Modules (cont.)

58

Multifunction Process Calibrator

Specifications

Specifications

Specifications are based on a one year calibration cycle and apply from +18 °C to +28 °C unless stated otherwise. All
specifications assume a five-minute warmup period.

DC Voltage Measurement and Source

Range Minimum Maximum

30 V (upper display) 0.000 30.000 0.010 % + 2 mV
20 V (lower display) 0.000 20.000 0.010 % + 2 mV
20 V (Source) 0.000 20.000 0.010 % + 2 mV
100 mV (Source) 0.000 100.000 0.010 % + 10 µV
90 mV (Read) 0.000 90.000 0.010 % + 10 µV

Maximum current output in voltage ranges is 1 mA with an output impedance of ≤ 1 Ω

DC mA Measurement and Source

Range Minimum Maximum

mA Read (Upper Display) 0.000 24.000

mA Read (Lower Display) 0.000 24.000

mA Source 0.000 24.000

Maximum load on, mA source is 1 ke. W ith the HART resistor on, maximum load is 750 Ω.
Voltage input range on simulate mode is 5 to 30 V

Accuracy,

(% of Reading + Floor)

Accuracy,

(% of Reading + Floor)

0.010 % + 2 µA

0.010 % + 2 µA

0.010 % + 2 µA

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Ohms Measurement

Ohms Range Minimum Maximum

Ohms Read (low) 0.00 400.00

Ohms Read (high) 401.0 4000.0

Accuracy

(% of Reading + Floor)

0.015 % + 0.05 Ω

0.015 % + 0.5 Ω

Ohms Source

Ohms Range Minimum Maximum

Ohms Source (low)

Ohms Source (high)

Unit is compatible with smart transmitters and PLCs.
Frequency response is ≤ 5 mS

5.0 400.0 0.1 to 0.5 mA

5.0 400.0 0.5 to 3 mA

400 1500 0.05 to 0.8 mA

1500 4000 0.05 to 0.4 mA

Excitation Current from

Measurement Device

Accuracy

(% of Reading + Floor)

0.015 % + 0.1 Ω

0.015 % + 0.05 Ω

0.015 % + 0.5 Ω

0.015 % + 0.5 Ω

Frequency Measurement

Range Minimum Maximum

CPM Read 2.0 1000.0 0.05 % + 0.1 CPM
Hz Read 1.0 1000.0 0.05 % + 0.1 Hz
KHz Read 1.00 15.00 0.05 % + 0.01 KHz

Accuracy

(% of Reading + Floor)

60

Multifunction Process Calibrator

Specifications

Frequency Source

Range Minimum Maximum Accuracy

CPM Source 2.0 1000 0.05 %
Hz Source 1.0 1000.0 0.05 %

1.0 10.00 0.25 % KHz Source

10.00 15.00 0.50 %

Temperature, Thermocouples

Type Minimum Maximum

-210 0.0 0.6 0.4

J

K

T

E

R

CJC error outside of 23 ± 5 °C is 0.05 °C / °C

0.0 800 0.4 0.2

800 1200 0.5 0.3

-200 0.0 0.8 0.6

0.0 1000 0.5 0.3

1000 1372 0.7 0.5

-250 0.0 0.8 0.6

0.0 400 0.4 0.2

-250 -100 0.8 0.6

-100 1000 0.4 0.4

-20 0.0 2.0 1.8

0.0 1767 1.4 1.2

CJC ON

Accuracy

CJC OFF

Accuracy

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726

Users Manual

Type

S

B

C

L

U

N

XK -200 800 0.4 0.2

BP

-20 0.0 2.0 1.8

0.0 1767 1.4 1.2

600 800 1.4 1.2

800 1000 1.5 1.3

1000 1820 1.7 1.5

0.0 1000 0.8 0.6

1000 2316 2.5 2.3

-200 0.0 0.45 0.25

0.0 900 0.4 0.2

-200 0.0 0.7 0.5

0.0 600 0.45 0.25

-200 0.0 1.0 0.8

0.0 1300 0.6 0.4

0.0 800 1.1 0.9

800 2500 2.3 2.1

Minimum Maximum

Thermocouple in mV read

Thermocouple in mV source

Maximum current output in voltage ranges is 1 mA with an output impedance of ≤ 1 e

CJC ON

Accuracy

Range Accuracy

-10 °C to 75 °C

-10 °C to 75 °C

CJC OFF
Accuracy

0.015 % + 10 µV

(% of Reading + Floor)

0.015 % + 10 µV

(% of Reading + Floor)

62

Multifunction Process Calibrator

Specifications

RTD Accuracy (Read and Source) (ITS-90)

Range Minimum Maximum Accuracy

Ni120 (672) -80.00 260.00 0.15

-200.00 100.00 0.15

Pt100 (385)

Pt100 (3926)

Pt100 (3916)

Pt200 (385)

Pt500 (385)

Pt1000 (385)

CU10 -10.00 250.00 1.8

Notes: Read Accuracy is based on 4-wire input. For 3-wire input, add ± 0.05 e assuming all three RTD leads are matched.
Source Accuracy is based on 0.5 to 3.0 mA excitation current (0.1 mA for pt1000 range)

100.00 300.00 0.25

300.00 600.00 0.35

600.00 800.00 0.45

-200.00 100.00 0.15

100.00 300.00 0.25

300.00 630.00 0.35

-200.00 100.00 0.15

100.00 300.00 0.25

300.00 630.00 0.35

-200.00 100.00 0.75

100.00 300.00 0.85

300.00 630.00 0.95

-200.00 100.00 0.35

100.00 300.00 0.45

300.00 630.00 0.55

-200.00 100.00 0.15

100.00 300.00 0.25

300.00 630.00 0.35

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Loop Power Supply

Voltage: 24 V
Maximum current: 22 mA
Short circuit protected.

Pulse Read and Pulse Source

Pulse Min Max Accuracy Frequency

Source

Read

1

10,000

100,000

1 Count 2 CPM to 10 kHz

Pressure Measurement

Range Resolution Accuracy Units Mode

Determined by
pressure module

5 digits Determined by

pressure module

psi, inH
cm H
mbar, kg/cm

O@4 °C, inH2O@20 °C, kPa,

2

O@4 °C, cmH2O@20 °C, bar,

2

, mmHg, inHg

2

Pushing A for 3 seconds
stores present pressure value
as an offset and subtracts it
from the displayed value

64

Multifunction Process Calibrator

Specifications

General Specifications

Operating temperature

Storage temperature

Stability

Operating altitude 3000 meters above mean sea level
Relative Humidity (% RH operating without condensation)

Vibration Random, 2 g, 5 to 500 Hz
Safety EN50082-1:1992 and EN55022: 1994 Class B Criteria A or B CSA

Power requirements 4 AA alkaline batteries
Protection Class Pollution Degree II
Size 96 x 200 x 47 mm. (3.75 x 7.9 x 1.86 in)
Weight 650 gm (1 lb, 7 oz)

-10 °C to 50 °C

- 20 °C to 70 °C
± 0.005 % of range/°C outside of 23 ± 5 °C

90 % (10 to 30 °C)
75 % (30 to 40 °C)
45 % (40 to 50 °C)
35 % (50 to 55 °C)
uncontrolled < 10 °C

C22.2 No 1010.1:1992

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66

Index

—0—

0% output parameter, setting, 41

—1—

100% output parameter, setting, 41

—4—

4 to 20 mA transmitter

simulating, 30

—A—

Accessories, 56
Auto ramping output, 42

67

—B—

Battery, replacing, 53

—C—

Calibration, 54
Celcius and Fahrenheit, 15
Cleaning calibrator, 54
Cold Junction Compensation (CJC), 15
Commands

Remote Control, 52
configuration menus, 14
Connections

for pressure sourcing, 39
Contact Information, 1

—D—

Data

Recall, 44

display

contrast adjustment, 14

Display, 13

—E—

Electrical parameters

measurement, 20
sourcing, 32

—F—

frequency output voltage, 15

726

Users Manual

—G—

Getting started, 16

—H—

HART

configuration menu, 16

—I—

I/P device, calibrating, 49
Input terminals, 8
Input/output terminals and connectors

(table), 9

—K—

Key functions (table), 11
Keys, 10

—L—

loop power, 18
Loop power

simulating, 30

—M—

Measure functions, summary (table), 2
Measure mode, 18
Measuring

pressure, 27
temperature with RTDs, 24
temperature with thermocouples, 21

menus

configuration, 14

—O—

Output device, testing, 51
Output terminals, 8

—P—

Parts list, 54
Percentage Error, 41
Pressure

Measurement, 27
Sourcing, 38

pressure modules

compatibility, 56

Pressure Modules

Compatibility, 56

Pressure modules available, 56

Pressure modules, zeroing, 28
Pressure Switch Test, 51
Pressure transmitter, calibrating, 47
Pulse Train Source/Read, 44

—R—

ramping, 41
Recalling setups, 42, 43
Remote control commands, 52
Repair, 54
Resistance-Temperature Detectors

accepted types (table), 25

RTD

simulating, 36

RTD

measuring, 24
types, 24

—S—

Safety information, 3
Saving

Measurements, 43
Servicing, 54
Setup

Recall, 43

recalling, 42, 43

68

Index

(continued)

storing, 42, 43
shut down mode, 15
Thermocouple, 34
Simulating

loop power, 30

RTD, 36

thermocouples, 34
Source functions, summary (table), 2
Source mode, 30
Sourcing

4 to 20 mA, 30

electrical parameters, 32

pressure, 38

thermocouples, 34
Specifications, 59
Standard equipment, 3
stepping, 41
Stepping output, 42
Storing setups, 42, 43
symbols, 7

—T—

Temperature

measuring with RTD, 24

measuring with thermocouple, 21
Terminals

input, 8
output, 8

Thermocouple

measuring, 21
measuring temperature, 21
sourcing, 34
types, 21

thermocouples

accepted types, 22

Transmitter

4 to 20 mA, simulating, 30

Transmitter, calibrating, 45

—V—

voltage to voltage test, 16

—Z—

Zeroing pressure modules, 28

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