Fluke 743B, 741B User Manual

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®

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PN 644788
June 1997 Rev.1, 3/98

© 1997, 1998 Fluke Corporation. All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.

741B/743B

Documenting Process Calibrator

Users Manual

LIMITED WARRANTY & LIMITATION OF LIABILITY

Test Equipment Depot
99 Washington Street
Melrose, MA 02176-6024

www.testequipmentdepot.com
800-517-8431
781-665-0780 FAX

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
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 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 or send the product, with a description of the difficulty, postage and insurance
prepaid (FOB Destination), to the nearest Fluke authorized service center. 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 the failure was caused by misuse, alteration, accident or abnormal condi­tion of operation or handling, 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 CONSEQUENT I AL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, WHETHER ARISING FROM
BREACH OF WARRANTY OR BASED ON CONTRACT, TORT , RELIANCE OR ANY OTHER 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 of competent
jurisdiction, such holding will not affect the validity or enforceability of any other provision.

5/94

Fluke Corporation Fluke Europe B.V.
P.O. Box 9090 P.O. Box 1186
Everett WA 98206-9090 5602 B.D.
U.S.A Eindhoven, The Netherlands

Table of Contents

Title Page

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

Standard Equipment...................................................................................................... 4

Safety Information......................................................................................................... 7

Getting Started Exercise ............................................................................................... 10

Operating Features ....................................................................................................... 12

Input and Output Jacks............................................................................................. 12

Keys ........................................................................................................................ 14

Display...................................................................................................................... 17

Setting Up the Calibrator............................................................................................... 19

Using the Strap and Bail........................................................................................... 19

Charging the Battery................................................................................................. 20

Battery Life ............................................................................................................... 22

Preserving Battery Life............................................................................................. 23

Using the Optional Battery Eliminator....................................................................... 23

Selecting the Display Language............................................................................... 24

Adjusting the Display Contrast.................................................................................. 24

i

741B/743B

Users Manual

Displaying the Date and Time................................................................................... 24

Using the Backlight ................................................................................................... 26

Personalizing the Calibrator...................................................................................... 26

Using Measure Mode..................................................................................................... 28

Measurement Ranges............................................................................................... 28

Measuring Electrical Parameters.............................................................................. 28

Testing Continuity..................................................................................................... 30

Measuring Pressure.................................................................................................. 30

Measuring Temperature............................................................................................ 34

Using Thermocouples .......................................................................................... 34

Using Resistance-Temperature Detectors (RTDs)............................................... 37

Measurements in Percent of Scale........................................................................... 41

Linear-Output Transmitters .................................................................................. 41

Square-Law Process Variables............................................................................ 41

Customizing mV Input Units...................................................................................... 42

Damping Your Measurements................................................................................... 43

Using Source Mode ....................................................................................................... 44

Sourcing Electrical Parameters................................................................................. 44

Simulating a 4 to 20 mA Transmitter......................................................................... 46

Supplying Loop Power.............................................................................................. 48

Sourcing Pressure..................................................................................................... 50

Simulating Thermocouples........................................................................................ 53

Simulating RTDs....................................................................................................... 54

Sourcing in Percent of Scale..................................................................................... 57

Linear-Responding Transmitters.......................................................................... 57

Square-Law Process Variables............................................................................ 57

Stepping and Ramping the Output Value.................................................................. 58

Using Manual Step............................................................................................... 58

ii

Contents

Using Auto Step................................................................................................... 59

Ramping the Output............................................................................................. 60

Simultaneous Measure/Source..................................................................................... 63

Calibrating a Process Instrument.................................................................................. 66

Generating “As Found” Test Data............................................................................. 66

Adjusting the Transmitter.......................................................................................... 71

“As Left” Test Run .................................................................................................... 72

Test Comments........................................................................................................ 73

Calibrating a Delta-Pressure Flow Instrument.......................................................... 73

Calibrating a Limit Switch......................................................................................... 74

Transmitter Mode.......................................................................................................... 77

Memory Operations....................................................................................................... 79

Saving Results.......................................................................................................... 79

Reviewing Memory................................................................................................... 81

Data Logging (Model 743B Only)............................................................................. 81

Recording Min and Max Measurements................................................................... 84

Running a Preloaded Task (743B only).................................................................... 84

Clearing Memory...................................................................................................... 84

Using the Built-in Calculator.......................................................................................... 85

Saving to and Recalling from the Registers.............................................................. 85

Using the Calculator to Set the Source Value.......................................................... 86

Quick Guide to Applications.......................................................................................... 86

Communicating with a PC (Model 743 Only)................................................................. 96

Maintenance.................................................................................................................. 96

Replacing the Battery Pack...................................................................................... 96

Internal Lithium Backup Battery................................................................................ 97

Cleaning the Calibrator............................................................................................. 97

Calibration Data........................................................................................................ 97

(continued)

iii

741B/743B

Users Manual

In Case of Difficulty................................................................................................... 97

Service Center Calibration or Repair ........................................................................ 98

Replacement Parts.................................................................................................... 99

Accessories.................................................................................................................... 100

Specifications................................................................................................................. 102

DC Voltage Measurement......................................................................................... 103

AC Voltage Measurement......................................................................................... 104

DC Current Measurement......................................................................................... 105

Resistance Measurement.......................................................................................... 105

Continuity Testing..................................................................................................... 106

Frequency Measurement.......................................................................................... 106

DC Voltage Output.................................................................................................... 107

DC Current Output.................................................................................................... 108

Resistance Sourcing................................................................................................. 109

Frequency Sourcing.................................................................................................. 110

Temperature, Thermocouples................................................................................... 111

Temperature, Resistance Temperature Detectors.................................................... 114

Loop Power Supply................................................................................................... 116

Top and Bottom Limits of Ranges with Auto Range On............................................ 117

General Specifications.............................................................................................. 119

Index ............................................................................................................................. 121

iv

List of Tables

Table Title Page

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

2. Input/Output Jacks and Connectors................................................................................... 12

3. Key Functions .................................................................................................................... 15

4. Battery Life......................................................................................................................... 22

5. Thermocouple Types Accepted.......................................................................................... 35

6. RTD Types Accepted......................................................................................................... 37

7. Simultaneous MEASURE/SOURCE Functions with Loop Power Disabled ....................... 64

8. Simultaneous MEASURE/SOURCE Functions with Loop Power Enabled........................ 65

9. Replacement Parts.............................................................................................................99

v

List of Figures

Figure Title Page

1. Standard Equipment .......................................................................................................... 5

2. Definition of Symbols .........................................................................................................8

3. Jumper Connections for Demonstration............................................................................. 11

4. Measure/Source Example.................................................................................................. 11

5. Input/Output Jacks and Connectors................................................................................... 13

6. Keys................................................................................................................................... 14

7. Elements of a Typical Display............................................................................................ 18

8. Using the Bail and Installing the Strap............................................................................... 19

9. Removing the Battery and Using the Charger.................................................................... 21

10. Electrical Measurement Connections................................................................................. 29

11. Gage and Differential Pressure Modules........................................................................... 31

12. Connections for Measuring Pressure................................................................................. 33

13. Measuring Temperature with a Thermocouple................................................................... 36

14. Using a Jumper Correctly................................................................................................... 39

15. Measuring Temperature with an RTD................................................................................ 40

16. Electrical Sourcing Connections ........................................................................................ 45

17. Connections for Simulating a 4 to 20 mA Transmitter........................................................ 47

vii

741B/743B

Users Manual

18. Connections for Supplying Loop Power.............................................................................. 49

19. Connections for Sourcing Pressure.................................................................................... 52

20. Connections for Simulating a Thermocouple...................................................................... 55

21. Connections for Simulating an RTD ................................................................................... 56

22. Checking a Relay Output Trip Alarm.................................................................................. 62

23. Calibrating a Thermocouple Temperature Transmitter....................................................... 68

24. Limit Switch Terminology.................................................................................................... 74

25. Calibrating a Chart Recorder.............................................................................................. 87

26. Measuring Voltage Drop..................................................................................................... 87

27. Monitoring AC Line Voltage and Frequency....................................................................... 88

28. Calibrating a Current-to-Pressure (I/P) Transmitter ............................................................ 89

29. Measuring the Output Current of a Transmitter.................................................................. 90

30. Measuring a Precision Resistor.......................................................................................... 91

31. Sourcing Resistance........................................................................................................... 91

32. Checking a Switch.............................................................................................................. 92

33. Checking a Tachometer...................................................................................................... 92

34. Calibrating a Pressure-to-Current (P/I) Transmitter ............................................................ 93

35. Calibrating a mV to Current Transmitter............................................................................. 94

36. Checking a Vortex Sheeding Flowmeter ............................................................................ 95

37. LCD Operating Environment Specification......................................................................... 120

viii

Documenting Process Calibrator

Introduction

Fluke 741B and 743B Documenting Process
Calibrators (hereafter referred to as the calibrator)
are battery-powered, hand-held instruments that
measure and source electrical and physical
parameters. See Table 1. The calibrator lets you
troubleshoot, calibrate, verify, and document your
work on process instruments. Calibrator
Specifications are near the back of the manual.

A summary of the measuring and sourcing functions
provided by the 741B and 743B calibrators is shown
in Table 1. In addition to these functions, the
calibrator has the following features:

• General features:
An analog display to make it easy to read

measurements when the input is unstable.
A setup option that lets you set the display to

English, French, German, Italian, or Spanish.
A thermocouple (TC) input/output jack and

internal isothermal block with automatic
reference-junction temperature compensation.
Or, you can manually enter an external
temperature reference.

The ability to store results for later review.

1

741B/743B

Users Manual

Table 1. Summary of Source and Measure Functions

Function Measure Source

v

dc V 0V to +/-300V 0V to 15V (10 mA max)

h

ac V 0V to 300V rms, 20 Hz to 5 kHz No sourcing

h

Frequency 1 Hz to 1 kHz (100 mV to 300V rms)

1 kHz to 30 kHz (0.5V to 30V rms)
30 kHz to 50 kHz (1V to 30V rms)

q

Resistance 0Ω to 11 kΩ 0Ω to 11 kΩ

m

dc Current 0 mA to 110 mA 0 to 22 mA (28V max), sourcing or sinking

q

Continuity Beep and the word Short indicates continuity No sourcing

t

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

t

RTD

Measure 2,3, or 4
wire.

Source 2 wire.

100Ω Platinum (3926)

100Ω Platinum (385)

120Ω Nickel (672)

200Ω Platinum (385)

500Ω Platinum (385)

1000Ω Platinum (385)

0.1V to 10V pk zero-symmetric sine or square

wave, 0 Hz to 50 kHz

10Ω Copper (427)

100Ω Platinum (3916)

p

Pressure 27 modules ranging from 0 to 10 in. H2O

(2.5 kPa) to 0 to 10,000 psi (69,000 kPa)

s

Loop Power 24 or 28V (22 mA max)

Note

Note: Use an external hand pump or other pressure source as a pressure stimulus for the source pressure function.

2

Documenting Process Calibrator

Introduction

The ability to automatically log up to 8,000 data
points (Model 743B only).

A serial computer interface for
uploading/downloading tasks, lists, and results
(Model 743B only).

Automatic calibration procedures for transmitters
and limit switches using split screen
MEASURE/SOURCE mode.

Transmitter mode in which the calibrator can be
configured to emulate the functions of a process
instrument.

Built-in calculator with square-root function, and
accessible registers containing measure and
source values.

An optional bar code wand for entering
alphanumeric characters (Model 743B only).

• Measuring features:
Damping (smoothing of the last several

readings), with display indicator of damped
status.

Display of measurements in engineering units,
percent of scale, square-law inputs, or custom
units.

The ability to capture and display minimum and
maximum measured levels.

• Sourcing features:
The ability to set source values to engineering

units, percent of scale, or square-law outputs.
Manual and automatic stepping, and an output

ramp feature for testing limit switches. Trip
detect is either a 1V change or a continuity
status change (Open or Short) from one ramp
increment to the next.

Unless stated otherwise, everything in this manual
applies to both the Fluke 741B and 743B
Documenting Process Calibrators.

For performance testing and calibration instructions
order the

602505).

The phone number in the USA and Canada for
replacement parts is: 1-800-526-4731.

74X Series Calibration Manual

(PN

3

741B/743B

Users Manual

For service help in the USA and Canada call a Fluke
Service Center. For application or operation
assistance on Fluke products call:

USA and Canada: 1-800-44-FLUKE
(1-800-443-5853)

Europe: [phone]
Japan: [phone]
Singapore: +65­ Anywhere in the world: [phone]
Or, visit Fluke’s Web site at www.fluke.com.

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 at the
end of this manual.

• TL24 industrial test leads (two sets)

-276-6196

*

• TP20 test probes (one set)

• BP7217 rechargeable nickel-cadmium battery

pack

• BC7210 battery charger with Instruction Sheet

• Adjustable quick-release strap (PN 946769)

• Jumper for three-wire RTD measurement

connections (two included, PN 944632)

741B/743B Users Manual

•
English (PN 644788)

French (PN 649688)
German (PN 649696)
Italian (PN 649704)
Spanish (PN 649670)



• DPC/TRACK

interface cable (9-pin male-female straight­through, PN 943738).

Software utility version with

• AC20 test clips (two sets)

4

Documenting Process Calibrator

Standard Equipment

TC

RTD

CLEAR

RANGE

(ZERO)

ENTER

V

300V

TC

MAX

AC20

Test Clip

(2 Red and 2 Black)

123

V

RTD

30V MAX

V

V

Hz

7

89

456

0

.

mA mA

RTD

MEASSOURCE

TL24

Test Leads

(2 Red and 2 Black)

Jumper

(2 Black)

TP20

Test Probe

(1 Red and 1 Black)

Strap

gj1f.eps

Figure 1. Standard Equipment

5

741B/743B

Users Manual

Users

Manual

BC7210

Battery Charger

7.2V

1700 mAh

Ni-Cd

U.S.A.

CORPORATION

FLUKE

DO NOT EXPOSE TO FIRE

SPECIFIED IN MANUAL

USE CHARGING PROCEDURES

BP7217

Nickel-Cadmium

Battery Pack

OF PROPERLY

MUST BE RECYCLED OR DISPOSED

DISASSEMBLE

DO NOT SHORT CIRCUIT OR

USE ONLY WITH FLUKE PRODUCTS

SAFE OPERATION

REFER TO USERS MANUAL FOR

RECHARGEABLE BATTERY

NICKEL-CADMIUM

BP7217

or

gj2f.eps

Figure 1. Standard Equipment (cont.)

6

Documenting Process Calibrator

Safety Information

Safety Information

This calibrator is designed and tested in accordance
with CAN/CSA C22.2 No. 1010.1-92, ANSI/ISA
S82.01-1994, UL3111 and EN610-10:1993. 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
hazards to the user; a Caution identifies conditions
and actions that may damage the calibrator or the
equipment under test.

Symbols used on the calibrator and in this manual
are explained in Figure 2.

7

741B/743B

Users Manual

AC-Alternating Current

DC-Direct Current

Fuse

Pressure

ON/OFF

Recycling

CAT

II

Figure 2. Definition of Symbols

To protect yourself, follow these safety guidelines:

• Do not use the calibrator if it is damaged. Before
you use the calibrator, inspect the insulating
cover. Look for cracks or missing plastic. Pay
particular attention to the insulation surrounding
the connectors.

CAUTION see explanation in manual

Common (LO) Input equipotentiality
Equipment protected throughout by DOUBLE INSULATION or

REINFORCED INSULATION
Conforms to relevent European Union directives.

Conforms to relevent Canadian Standards Association directives.

Overvoltage (Installation) Category
of Impluse Withstand Voltage protection provided. Typical locations
include; Mains Wall outlets, local appliances and PORTABLE
EQUIPMENT.

II

per IEC 1010-1 refers to the level

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

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

gj56f.eps

8

Documenting Process Calibrator

Safety Information

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

• Select the proper function and range for your
measurement.

• Use caution when working above 30V ac rms,
42V ac pk, or 60V dc. Such voltages pose a
shock hazard.

• 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 operate the calibrator around explosive
gas, vapor, or dust.

• When using a pressure module, make sure the
process pressure line is shut off and
depressurized before you connect it to or
disconnect it from the pressure module.

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

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

9

741B/743B

Users Manual

Getting Started Exercise

The following is a brief getting started exercise that
will make it easier to understand the instructions in
the rest of the manual.

1. When you first unpack the calibrator, you will
need to charge the battery. See Figure 9 and
charge the battery for 2 hours.

2. Reinstall the battery in the calibrator.

3. Connect the calibrator’s voltage output to its

voltage input as follows: connect leftmost pair of
jacks (V Ω RTD SOURCE) to the right most pair
of jacks (V MEAS). (See Figure 3.)

4. Press o to turn on the calibrator. Press u and
d to adjust the display contrast for the best
looking display. The calibrator powers up in the
dc voltage measurement function, and is taking
readings on the V MEAS pair of input jacks.

5. Press M to switch to the SOURCE screen.
The calibrator is still measuring dc voltage, and
you can see the active measurements at the top
of the display.

6. Press v to select dc voltage sourcing. Press
5 on the keypad and e to begin sourcing

5.0000V dc.

7. Now press M to go to the split-screen,
simultaneous MEASURE/SOURCE mode. The
calibrator is simultaneously sourcing dc volts
and measuring dc volts. You can see the
measurement readings in the top window, and
the active source value in the bottom window as
shown in Figure 4.

10

Documenting Process Calibrator

Getting Started Exercise

TC

RTD

RANGE

CLEAR

(ZERO)

ENTER

.

V

300V

TC

MAX

V

RTD

30V

MAX

V

V

Hz

7

89

456

123

0

mA mA

RTD

CAT

SOURCE

MEAS

30V

30V

MAX

MAX

Figure 3. Jumper Connections for Demonstration

gj3f.eps

gj4s.eps

Figure 4. Measure/Source Example

11

741B/743B

Users Manual

Operating Features

Input and Output Jacks

Figure 5 shows the calibrator input and output jacks.
Table 2 explains their use.

Table 2. Input/Output Jacks and Connectors

No. Name Description

1 Battery Eliminator jack Jack for the Model BE9005 Battery Eliminator. Use the battery eliminator for bench-top

applications where ac line power is available. This input does not charge the battery.

2 wSERIAL PORT

(743B Only)

3 Pressure module

connector

4 TC input/output Jack for measuring or simulating thermocouples. This jack accepts a miniature

5, 6 w MEAS V jacks Input jacks for measuring voltage, frequency, or three- or four-wire RTDs (Resistance

7, 8 w SOURCE mA,

MEAS mA Ω RTD
jacks

9,10 w SOURCE V Ω

RTD jacks

Connects the calibrator to an RS-232 serial port on a personal computer.

Connects the calibrator to a pressure module.

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

Temperature Detectors).
Jacks for sourcing or measuring current, measuring resistance and RTDs, and
supplying loop power.

Output jacks for sourcing voltage, resistance, frequency, and for simulating RTDs.

12

DOCUMENTING PROCESS CALIBRATOR

743B

Documenting Process Calibrator

Operating Features

1

2

3

V

RTD

30V

MAX

MEAS

SOURCE

V

V

Hz

7

89

456

123

0

.

mA mA

RTD

CAT

SOURCE

MEAS

30V

30V

MAX

MAX

SETUPmA

TC

RTD

RANGE

CLEAR

(ZERO)

ENTER

V

300V

TC

MAX

4

10

9

7

8

5

6

ki05f.eps

Figure 5. Input/Output Jacks and Connectors

13

741B/743B

Users Manual

Keys

Figure 6 shows the calibrator keys and Table 3
explains their functions. The softkeys are the four
unmarked blue keys just below the display. Softkey
functions are defined by the labels that appear above
the softkey during operation. Softkey labels and
other display text are shown in this manual in bold
type, for example,

Choices.

DOCUMENTING PROCESS CALIBRATOR

743B

21

3

4

16

MEAS

15

14

13

SOURCE

V

V

Hz

789

456

123

0

mA mA

V
RTD

SOURCE

30V

MAX

30V
MAX

SETUPmA

TC

RTD

RANGE

CLEAR

(ZERO)

ENTER

.

V

RTD

CAT

MEAS

300V
30V
MAX

TC

5

6

7
8
9

10

11

12

14

ki06f.eps

Figure 6. Keys

Table 3. Key Functions

No. Name Description

1 M key Cycles the calibrator through MEASURE, SOURCE, and MEASURE/SOURCE modes.
2 m key Selects mA (current) measure or source function. For loop power on/off, go to the Setup

mode.
3 s key Enters and exits Setup mode to modify operating parameters.
4 Softkeys Perform the function defined by the label above each key on the display.
5 C key Turns the backlight on and off.
6 p key Selects the pressure measurement or sourcing function.
7 t key Selects TC (thermocouple) or RTD (resistance temperature detector) measurement or

sourcing functions.
8 r key Toggles between autorange and locked range, and increments range. Each time you press

Documenting Process Calibrator

Operating Features

r, the cali brator locks on the next range. Press this key again for 2 seconds to resume

autorange. In calculator mode, provides the square root function.
9 c key Clears a partial data entry, or zeros the output when in the SOURCE mode. When using a

pressure module, zeros the pressure module reading.

15

741B/743B

Users Manual

Table 3. Key Functions (cont.)

No. Name Description

10 u, d, L, and R

keys

11

12

e

q

key Terminates a numeric entry when setting a source value, or confirms your choice in a

key Toggles between resistance and continuity functions in MEASURE mode, or selects

• Adjust the display contra st.

• Make choices from lists on the display.

• Increase or decrease the source level when using the step feature.

• In calculator mode, provide arithmetic functions (+ - ÷ ×).

list. In calculator mode, provides the equals arithmetic operator (=).

the resistance function in SOURCE mode.

13 Numeric keypad Used whenever a numeric entry is required.
14

15

16

h

key Toggles between ac voltage and frequency functions in MEASURE mode, or selects

frequency output in SOURCE mode.

v

key Selects the dc voltage function in MEASURE mode, or selects dc voltage in SOURCE

mode.

o

key Turns the power on and off.

16

Display

Figure 7 shows the features of a typical display. The
display shown is MEASURE mode. Near the top of

the display is “Source Off.” This is the area of the
display that shows what is happening in the other
mode (SOURCE or MEASURE). The other parts of
the display are as follows:

Status Bar: shows the time and date (if set in

•

Setup mode), and shows the status of Loop
Power, Battery Save, and Backlight Timeout; all
of which are set in Setup mode. The low battery
and backlight on annunciators also appear here.

Mode Indicator: Shows whether the calibrator is

•

in MEASURE or SOURCE mode. In split screen
MEASURE/SOURCE mode, there is a Mode
Indicator for each window.

Documenting Process Calibrator

Operating Features

Measured Value: Shows the measured value in

•

your choice of engineering units or percent of
scale.

Range Status: Shows whether Auto Range is on,

•

and what range is currently being used.
Custom Units Indicator: Shows that the displayed

•

units are custom. The original engineering units
of the measure or source function are not
displayed. The value may also be scaled.

Secondary Value: Shows the measure or source

•

value in original engineering units whenever
scaling or custom units are active.

17

741B/743B

Users Manual

Loop Power Annunciator

Time and Date Display

Status Bar

Mode Indicator

Measured Value

Battery Save Annunciator

Source Status

Undamped (Unsettled)
Indicator

Custom Units Indicator
Secondary Value

Range Status

Softkey Labels

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Figure 7. Elements of a Typical Display

18

Setting Up the Calibrator

Using the Strap and Bail

After you unpack the calibrator, attach its carrying
strap as shown in Figure 8. You can adjust the strap
as necessary to hang the calibrator on any sturdy

Figure 8. Using the Bail and Installing the Strap

Documenting Process Calibrator

Setting Up the Calibrator

support. Figure 8 also shows you how to open the
bail to stand the calibrator at a comfortable viewing
angle for benchtop use.

gj8f.eps

19

741B/743B

Users Manual

Charging the Battery

wBefore you use the calibrator for the first time,
charge its battery pack for 2 hours in the external
battery charger.

Figure 9 shows how to remove the battery. Remove
the battery door and tap the calibrator with your
hand to get the battery out. Place the battery in the
charger and connect the charger to line power. The
charger automatically senses line voltage and
adjusts itself accordingly.

A discharged battery is fully charged in 2 hours or
less in fast-charge mode (steady indicator light on
the charger). Full charge is maintained after that

time in trickle-charge mode (blinking indicator light
on the charger). Switching between charging modes
is automatic. You can leave the battery pack on
trickle charge indefinitely without damage.

Note

When you remove a charged battery from
the charger, wait for the blinking indicator to
go off before you insert a discharged
battery. It takes about 2 seconds for the
battery charger to reset.

20

BATTERY ACCESSBATTERY ACCESS

Documenting Process Calibrator

Setting Up the Calibrator

1

BATTERY ACCESSBATTERY ACCESS

BATTERY ACCESSBATTERY ACCESS

2

3

4

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Figure 9. Removing the Battery and Using the

Charger

21