Fluke 743B, 741B User Manual

99 Washington Street

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

Melrose, MA 02176

Phone 781-665-1400 Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

PN 644788 June 1997 Rev.1, 3/98

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

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

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

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

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

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.

741B/743B

Users Manual

Table 1. Summary of Source and Measure Functions

Function Measure Source

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

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

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)

Resistance 0Ω to 11 kΩ 0Ω to 11 kΩ

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

Continuity Beep and the word Short indicates continuity No sourcing

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

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)

Pressure 27 modules ranging from 0 to 10 in. H2O

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

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.

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

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: +31 402-678-200 Japan: +81-3-3434-0181 Singapore: +65 Anywhere in the world: +1-425-356-5500 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)

Documenting Process Calibrator

Standard Equipment

RTD

CLEAR

RANGE

(ZERO)

ENTER

300V

MAX

AC20

Test Clip

(2 Red and 2 Black)

123

RTD

30V MAX

456

mA mA

RTD

MEASSOURCE

TL24

Test Leads

(2 Red and 2 Black)

Jumper

(2 Black)

TP20

Test Probe

(1 Red and 1 Black)

Strap

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Figure 1. Standard Equipment

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

gj2f.eps

Figure 1. Standard Equipment (cont.)

Documenting Process Calibrator

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.

741B/743B

Users Manual

AC-Alternating Current

DC-Direct Current

Fuse

Pressure

ON/OFF

Recycling

CAT

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.

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

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.

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.

Documenting Process Calibrator

Getting Started Exercise

RTD

RANGE

CLEAR

(ZERO)

ENTER

300V

MAX

RTD

30V

MAX

456

123

mA mA

RTD

CAT

SOURCE

MEAS

30V

MAX

Figure 3. Jumper Connections for Demonstration

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gj4s.eps

Figure 4. Measure/Source Example

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.

DOCUMENTING PROCESS CALIBRATOR

743B

Documenting Process Calibrator

Operating Features

RTD

30V

MAX

MEAS

SOURCE

456

123

mA mA

RTD

CAT

SOURCE

MEAS

30V

MAX

SETUPmA

RTD

RANGE

CLEAR

(ZERO)

ENTER

300V

MAX

ki05f.eps

Figure 5. Input/Output Jacks and Connectors

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

MEAS

SOURCE

789

456

123

mA mA

V RTD

SOURCE

30V

MAX

30V MAX

SETUPmA

RTD

RANGE

CLEAR

(ZERO)

ENTER

RTD

CAT

MEAS

300V 30V MAX

7 8 9

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.

741B/743B

Users Manual

Table 3. Key Functions (cont.)

No. Name Description

10 u, d, L, and R

keys

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

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

frequency output in SOURCE mode.

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

mode.

key Turns the power on and off.

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.

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

gj7c.eps

Figure 7. Elements of a Typical Display

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

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.

BATTERY ACCESSBATTERY ACCESS

Documenting Process Calibrator

Setting Up the Calibrator

BATTERY ACCESSBATTERY ACCESS

gj9f.eps

Figure 9. Removing the Battery and Using the

Charger

741B/743B

Users Manual

Battery Life

Table 4 shows the operating time for a new, fully charged battery pack. Calibrator performance is guaranteed to meet specifications until the low battery annunciator b located at the top right side of the display appears and the beeper beeps every 4 seconds. When the b annunciator appears, stop using the calibrator and charge the battery. If you have a fully charged spare battery, exchange it with the low battery.

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

The battery normally lasts for up to 1000 charge / discharge cycles. To replace the battery, refer to

“Replacing the Battery” later in this manual for instructions. For longest battery life and best

WWarning

performance, wait for b to appear before you charge the battery.

Table 4. Battery Life

Operating Modes Backlight Off Backlight On

Measure, continuous 6.5 Hours 6 Hours Measure and source, with loop power on, continuous 3.5 Hours 3 Hours Typical intermittent operation >8 Hours >8 Hours

Documenting Process Calibrator

Setting Up the Calibrator

Preserving Battery Life

An optional Auto Battery Save feature turns the calibrator off after a selected idle time. The default setting for

Battery Save

upper right corner of the display. The setting is preserved after you turn off the power. Auto Battery Save works the same when using the battery eliminator. Turn on the follows:

1. Press s.

2. Press d to highlight

3. Press e or the Choices softkey.

4. Press u to highlight On, then press e.

5. To accept the timeout period shown on the

6. To change the timeout period, press d to

Auto Battery Save is Off. When Auto

is On, the E symbol shows in the

Auto Battery Save feature as

Off following Auto Battery

Save

display, you can finish here. Press

Done to exit

Setup mode and do not go on to step 6.

highlight the timeout period following

Save Timeout

Battery

7. Press e or the

Choices softkey.

8. Enter your choice of timeout period in minutes (accepted range: 1 to 120 minutes).

9. Press the

Done softkey.

10. Press the Done softkey or s to exit Setup mode.

Using the Optional Battery Eliminator

Caution

To avoid damage to the calibrator, use only Fluke Model BE9005 Series Battery Eliminator, available from your Fluke representative.

Where ac power is available, you can use the optional Fluke Model BE9005 Battery Eliminator to conserve battery power. When the battery eliminator is used, the battery is internally disconnected, and can be removed from the calibrator. The battery eliminator does not charge the battery.

741B/743B

Users Manual

The battery eliminator is handy for troubleshooting process instruments on the workbench, and for longterm data logging. When you calibrate an instrument, you will get best results using battery power.

Selecting the Display Language

The calibrator displays information in five languages. English is the default. To change the display language, proceed as follows:

1. Press s.

2. Press the third softkey from the left twice.

3. Press d three times.

4. Press e.

5. Press u or d to highlight your choice of language.

6. Press e to confirm your choice. The language you choose is the power-up default.

7. Press s to exit Setup mode.

Adjusting the Display Contrast

Press u or R to increase contrast. Press L or d to decrease contrast. When the u and d keys

are being used to select an item from a list, for example in Setup mode, use the L and R keys. In calculator mode, all four direction keys are used for arithmetic functions.

Displaying the Date and Time

The date and time can be shown at the top of the display during normal operation. In Setup mode you can turn this date and time display on or off. You can also control the format used to display the date and time. You should set the calendar and clock whether or not you use the date and time display, since a timestamp is applied to all saved results.

Proceed as follows to set up the time and date displays:

Documenting Process Calibrator

Setting Up the Calibrator

1. Press

2. Press the

Next Page softkey. The display

appears as follows:

gj39s.eps

4. Press u or d to move the cursor to the desired date format.

5. Press e to go back to the s display.

Done

gj38s.eps

6. Make another selection or press the softkey or s to save your settings and exit Setup mode.

3. Use the u and d keys to move the cursor to the parameter you want to change, then press e or the

Choices softkey to choose a

setting for that parameter. For example, the following display appears after you select

Format

Date

741B/743B

Users Manual

Using the Backlight

Press C to toggle the display backlight on and off. When the backlight is on, the G symbol shows at the top of the display. You can minimize battery usage by setting the calibrator to turn the display backlight off automatically. When the backlight is on and Auto Backlight Off is activated, the a symbol shows at the top of the display. To automatically turn off the backlight after a set time, proceed as follows:

1. Press s.

2. Press d to highlight

Off

3. Press e or the Choices softkey.

4. Press u to highlight On, then press e.

5. To accept the timeout period shown on the display, press

Done to exit, and do not go on to

step 6.

6. To change the timeout period, press d to highlight the timeout period following

Timeout

Off following Auto Backlight

Backlight

7. Press e or the

Choices softkey.

8. Enter your choice of timeout period in minutes (accepted range: 1 to 120 minutes).

9. Press the

Done softkey.

10. Press the Done softkey or s to exit Setup mode.

Personalizing the Calibrator

You can load your name or some other alphanumeric identifier into the calibrator to be displayed at powerup and in saved results. Proceed as follows to load an identifier:

1. Press s.

2. Press

3. Press d to move the cursor to the same line as

Next Page twice.

ID.

Documenting Process Calibrator

Setting Up the Calibrator

4. Press

e or the

Choices softkey. The

display appears as follows:

gj40s.eps

5. The ID string is shown at the bottom of the boxed area. To erase a character, press the

Space

softkey. To erase the whole string, press

Back

6. Press u, d, L, or R to select a character, then press e. Use the numeric keypad if you want to enter a number.

7. Repeat step 6 until you are satisfied with the ID string appearing in the window.

8. Press the

Done softkey.

9. Press the Done softkey or s to exit Setup mode.

741B/743B

Users Manual

Using Measure Mode

Note

To achieve best noise rejection and highest accuracy performance, do not use the battery eliminator, and tie all three common jacks together.

The operating mode (i.e., MEASURE, SOURCE) is shown in a reverse-video bar on the display. If the calibrator is not in MEASURE mode, press M until MEASURE is shown. You must be in MEASURE mode to change any of the MEASURE parameters.

Measurement Ranges

The calibrator normally changes to the appropriate measurement range automatically. The lower right

side of the display shows either “Range” or “Auto Range” depending on the range status. Auto Range switch points are shown in the specifications at the

end of this manual. When you press the r key, the range is locked. Press it again to cycle to and lock on the next higher range. Press it and hold it for two seconds to revert to Auto Range.

If the range is locked, overrange inputs produce a display of produce a display of

- - - - - -. In Auto Range, out of range inputs ! ! ! ! ! !.

Measuring Electrical Parameters

When you turn on the calibrator, it powers up in the dc voltage measurement function. Figure 10 shows electrical measurement connections. To select an electrical measurement function from either SOURCE or MEASURE/SOURCE mode, first press M for MEASURE mode, then proceed as follows:

1. Press m for current, v for dc voltage, h once for ac voltage or twice for frequency, or q for resistance.

Documenting Process Calibrator

Using Measure Mode

Red

V RTD

MAX

mA mA

SOURCE

30V

MAX

RTD

CAT

MEAS

300V

MAX

30V

MAX

+–

Black

mA mA

Red

RTD

SOURCE

30V

MAX

30V

MAX

Black

Figure 10. Electrical Measurement Connections

RTD

CAT

MEAS

30V

MAX

300V

MAX

gj10f.eps

741B/743B

Users Manual

Note

When measuring frequency, you are prompted to select a frequency range. If you expect the frequency you are measuring to

be below 20 Hz, press lower frequency range, then press

2. Connect the test leads as shown in Figure 10, depending on the measurement function.

to select the

Testing Continuity

When testing continuity, the beeper sounds and the

Short appears on the display when the

word resistance between the Ω MEAS jack and its common jack is less than 25Ω. The word appears when the resistance is greater than 400Ω. Proceed as follows to test continuity:

1. Remove power from the circuit to be tested.

2. If necessary, press M for MEASURE mode.

3. Press q twice so that

4. Connect the calibrator to the circuit to be tested as Figure 10 shows.

Open appears.

Open

Measuring Pressure

Many ranges and types of pressure modules are

available from Fluke. See “Accessories” near the back of this manual. Before you use a pressure module, read its Instruction Sheet. The modules vary in how you use them, how you zero them, what types of process pressure media are allowed, and accuracy specification.

Figure 11 shows 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 as described in the module’s Instruction Sheet.

Proceed as follows to measure pressure:

Warning

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

Gage

700P06

PRESSURE MODULE

RANGE

100 PSIG

7 bar700 kPa

BURST PRESSURE 300 PSIG

Figure 11. Gage and Differential Pressure Modules

Differential

700P04

PRESSURE MODULE

RANGE

15 PSID/G

1 bar100 kPa

BURST PRESSURE 45 PSIG

HighLow

gj11f.eps

Documenting Process Calibrator

Using Measure Mode

Caution

To avoid mechanically damaging the pressure module, never apply more than 10 ft.-lb. of torque between the pressure module fittings, or between the fittings and the body of the module. Always apply appropriate torque between the pressure module fitting and connecting fittings or adapters.

To avoid damaging the pressure module from overpressure, never apply pressure above the rated maximum printed on the pressure module.

To avoid damaging the pressure module from corrosion, use it only with specified materials. Refer to the printing on the pressure module or the pressure module instruction sheet for the acceptable material compatibility.

741B/743B

Users Manual

1. Connect a pressure module to the calibrator as shown in Figure 12. 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 M for MEASURE mode.

3. Press p. The calibrator automatically senses which pressure module is attached and sets its range accordingly.

4. Zero the pressure module as described in the module’s Instruction Sheet. Modules vary in zeroing procedures depending on module type. You MUST perform this step before you execute a task that sources or measures pressure.

5. If desired, you can change pressure display units to psi, mHg, inHg, mH

O@60°F, ftH2O, bar, g/cm2, or Pa. Metric

inH

O, inH2O@,

units (kPa, mmHg, etc.) are shown in Setup mode in their base units (Pa, mHg, etc.). Change the pressure display units as follows:

a. Press s. b. Press

Next Page twice.

c. Press e or the Choices softkey with

the cursor on

Pressure Units.

d. Select the pressure units with u or d. e. Press e. f. Press Done.

Documenting Process Calibrator

Using Measure Mode

RTD

30V

MAX

SOURCE

456

123

mA mA

RTD

CAT

SOURCE

MEAS

30V

MAX

DOCUMENTING PROCESS CALIBRATOR

743B

Isolation

Valve

Gage

Module

MEAS

SETUPmA

RTD

RANGE

CLEAR

(ZERO)

ENTER

300V

MAX

Differential

Module

Tank

ki12c.eps

Figure 12. Connections for Measuring Pressure

741B/743B

Users Manual

Measuring Temperature

Using Thermocouples

The calibrator supports eleven standard thermocouples, each identified with an alpha character: E, N, J, K, T, B, R, S, C, L, or U. Table 5 summarizes the ranges and characteristics of the supported thermocouples.

To measure temperature using a thermocouple, proceed as follows:

1. Attach the thermocouple leads to the appropriate TC miniplug, then to the TC input/output as shown in Figure 13.

other. Do not try to force a miniplug in the wrong polarization

If the calibrator and the thermocouple plug

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

1. If necessary, press M for MEASURE mode.

One pin is wider than the

Note

2. Press t. The display prompts you to select the thermocouple type.

3. Select the desired thermocouple type using the u or d followed by e.

4. If necessary, you can change between

Temperature Units

a. Press s. b. Press the c. Use the u and d keys to move the cursor

to the desired parameter. Then press either e or the setting for that parameter.

d. Press u or d to move the cursor to the

desired setting.

e. Press e to go back to the s

display.

f. Press the Done softkey or s to exit Setup

mode.

5. If necessary, you can change between

IPTS-68 Temperature Scale in Setup mode. The

procedure is the same as steps a-f above.

as follows:

Next Page softkey twice.

Choices softkey to choose a

°C or °F

ITS-90 or

Table 5. Thermocouple Types Accepted

Positive Lead (H)

Type Positive Lead

Material

E Chromel Purple Violet Constantan -250 to 1000 N Ni-Cr-Si Orange Pink Ni-Si-Mg -200 to 1300

J Iron White Black Constantan -210 to 1200 K Chromel Yellow Green Alumel -270 to 1372 T Copper Blue Brown Constantan -250 to 400 B Platinum (30% Rhodium) Gray Platinum (6% Rhodium) 600 to 1820 R Platinum (13% Rhodium) Black Orange Platinum -20 to 1767 S Platinum (10% Rhodium) Black Orange Platinum -20 to 1767

C *** Tungsten (5% Rhenium) White Tungsten (26% Rhenium) 0 to 2316

L (DIN J) Iron Constantan -200 to 900

Color Negative Lead Specified Range

ANSI* IEC**

Material (°C)

Documenting Process Calibrator

Using Measure Mode

U (DIN T) Copper Constantan -200 to 600 *American National Standards Institute (ANSI) device negative lead (L) is always red.

**International Electrotechnical Commissi on (IEC) device negative lead (L) is always white. *** Not an ANSI designation but a Hoskins Engineering Company designation.

741B/743B

Users Manual

V RTD

MAX

mA mA

SOURCE

30V

MAX

RTD

CAT

MEAS

30V

MAX

300V

MAX

Process Temperature

Warning

TC Miniplug

Figure 13. Measuring Temperature with a Thermocouple

30V maximum to

gj12f.eps

Documenting Process Calibrator

Using Measure Mode

Using Resistance-Temperature Detectors (RTDs)

terminal configuration. The calibrator accepts RTD measurement inputs in two-, three-, or four-wire connections as shown in Figure 15. A four-wire

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

Pt100 (3926) 100Ω Platinum 0.003926Ω/°C -200 to 630 *Pt100 (385) 100Ω Platinum 0.00385Ω/°C -200 to 800 Ni120 (672) 120Ω Nickel 0.00672Ω/°C -80 to 260 Pt200 (385) 200Ω Platinum 0.00385Ω/°C -200 to 630 Pt500 (385) 500Ω Platinum 0.00385Ω/°C -200 to 630 Pt1000 (385) 1000Ω Platinum 0.00385Ω/°C -200 to 630 Cu10 (427) 9.035Ω ** Copper 0.00427Ω/°C -100 to 260 Pt100 (3916) 100Ω Platinum 0.003916Ω/°C -200 to 630

*Per IEC 751-Standard **10Ω @ 25°C

is 100Ω. Most RTDs come in a three-

RTD Type Ice Point (R

) Material α Range (°C)

. The most

Table 6. RTD Types Accepted

configuration provides the highest measurement precision, and two-wire provides the lowest measurement precision.

741B/743B

Users Manual

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

1. If necessary, press

2. Press t twice so that

M for MEASURE mode.

Select RTD Type shows.

3. Press u or d to select the desired RTD type.

4. Press e.

5. Press u or d to select a 2-, 3-, or 4- wire connection.

6. Attach the RTD to input jacks as the display or Figure 15 shows. Use the supplied jumper between the mA Ω RTD MEAS low jack and the V MEAS low jack as shown if you are using a 3wire connection.

7. Press e.

Caution

Do not force a dual banana plug between any two jacks in the horizontal orientation. Doing so will damage the jacks. Use the supplied jumper wire when needed for RTD measurements. You can use a dual banana plug in the vertical orientation. See Figure 14.

Documenting Process Calibrator

Using Measure Mode

8. If necessary, you can change between °C or °F temperature units in Setup mode as follows:

mA mA

V RTD

SOURCE

30V MAX

RTD

CAT

MEAS

300V

MAX

30V MAX

WRONG

a. Press s. b. Press the

Next Page softkey twice.

c. Use the u and d keys to move the cursor

to the parameter you which to change, then press e or the

Choices softkey to

choose a setting for that parameter.

d. Press u or d to move the cursor to the

mA mA

RTD

30V MAX

RTD

300V

MEASSOURCE

MAX

RTD

30V MAX

RTD

300V

MEASSOURCE

MAX

desired setting.

e. Press e to go back to the s

display.

f. Press the

Done softkey or s to exit Setup

mode.

ITS-90 or

Figure 14. Using a Jumper Correctly

gj14f.eps

9. If necessary, you can change between

IPTS-68 Temperature Scale in Setup mode. The

procedure is the same as steps a through f above.

741B/743B

Users Manual

mA mA

V RTD

SOURCE

30V MAX

30V

MAX

mA mA

V RTD

SOURCE

30V MAX

30V

MAX

mA mA

V RTD

SOURCE

30V MAX

30V

MAX

RTD

CAT

MEAS

RTD

CAT

MEAS

RTD

CAT

MEAS

300V

MAX

30V

MAX

300V

MAX

30V

MAX

300V

MAX

30V

MAX

RTD

gj15f.eps

Figure 15. Measuring Temperature with an RTD

Documenting Process Calibrator

Using Measure Mode

Measurements in Percent of Scale

This feature lets you scale the measurements in

accordance with a particular process instrument’s response. Percent of scale works for linear-output transmitters or square-law transmitters such as differential pressure transmitters that report flow rate.

Linear-Output Transmitters

1. If necessary, press M for MEASURE mode.

2. Select a measurement function (m, v, q, t, or p) as previously described.

3. Press the

4. Use the numeric keypad to enter the 0% of scale value (

5. Press e.

6. Use the numeric keypad to enter the 100% of scale value (

7. Press e.

8. Leave Mode set to %.

Scale softkey.

0% Value).

100% Value).

9. Press the Percent of scale remains in effect until you press the

Scale softkey again or change to another

measurement function.

Done softkey.

Square-Law Process Variables

When you select √ within scaling, the calibrator takes the square root of its input and displays the measurement in percent. For example, when connected to the output of a delta-pressure transmitter, the calibrator reading is proportional to flow rate.

1. If necessary, press M for MEASURE mode.

2. Select a measurement function (m, v, q, t, or p) as previously described.

3. Press the

4. Use the numeric keypad to enter the 0% of scale value (

Scale softkey.

0% Value).

741B/743B

Users Manual

5. Press

6. Use the numeric keypad to enter the 100% of scale value (

100% Value).

7. Press e.

8. Set Mode to √.

9. Press e.

10. Press the Done softkey.

Percent of scale remains in effect until you press the

Scale softkey again or change to another

measurement function. Set scaling

Units

to return to normal operation.

Mode to Eng.

Customizing mV Input Units

The calibrator works with any measurement accessory that converts an input parameter to a linear millivolt output. Use the for this purpose. After you name and scale a custom measurement unit, the display shows both the new scaled custom unit and the actual measured parameter.

Proceed as follows to set up a custom unit:

Custom Units feature

1. When measuring the millivolt output of the accessory, press the

Custom Units softkey.

2. Enter the name of the custom units (up to four characters), for example

PH (for pH), using the

alphanumeric entry window, then press e.

3. Press the

÷10 or ×10 softkey as many times as

you need to select the proper scaling, then press e.

Custom Units are active, the w symbol shows

While on the display to the right of the custom unit. Once you have programmed the custom measurement unit, the custom unit is available for calibration procedures in split-screen MEASURE/SOURCE mode. To cancel

Custom Units softkey again.

Custom Units, press the

Warning

To avoid possible electric shock, when using Custom Units, always refer to the Secondary Value displayed below and to the right of the main display for the actual value of the measurement in native engineering units.

Documenting Process Calibrator

Using Measure Mode

Damping Your Measurements

The calibrator normally applies a software filter to dampen measurements in all functions except continuity. The specifications assume that damping is turned on. The damping method is a running average of the last several measurements. Fluke recommends that you leave damping on. Turning damping off may be useful when measurement response is more important than accuracy or noise reduction. If you want to turn off damping, press the

More Choices softkey twice, then press the Dampen

softkey so that Off appears. Press Dampen again to turn damping back on. The default state is

On.

Note

If a measurement falls outside a random noise window, a new average is started. If damping is turned off, or until measurements are fully

damped, the

symbol is displayed.

741B/743B

Users Manual

Using Source Mode

The operating mode (i.e., MEASURE, SOURCE) is shown in a reverse-video bar on the display. If the calibrator is not in SOURCE mode, press M until SOURCE is shown. You must be in SOURCE mode to change any of the SOURCE parameters.

Sourcing Electrical Parameters

To select an electrical sourcing function, proceed as follows:

1. Connect the test leads as shown in Figure 16, depending on the source function.

2. Press M for current, v for dc voltage, h for frequency, or q for resistance.

3. Enter the desired output value, then press

e. For example, to source 5.0V dc, press v 5 . 0 e.

Note

If you are sourcing frequency, respond to the display prompt to select a zero-symmetric sine or positive square wave. The amplitude you specify is p-p amplitude.

4. To change the output value enter a new value and press e.

Note

If you are sourcing current, wait for the symbol to go out before you use the output.

5. To set the output value to 0 in the present source function, press c.

6. To turn off sourcing completely, press c twice.

Note

Use the source current function to drive a current loop. This is different than the loop power function in which the calibrator is powering a process instrument. To source loop power, use the accessible from Setup mode.

Loop Power

function

Documenting Process Calibrator

Using Source Mode

mA mA

Red

RTD

SOURCE

30V

MAX

30V

MAX

RTD

CAT

MEAS

300V

MAX

30V

MAX

–

Black

Common

mA mA

Red

RTD

SOURCE

30V

MAX

30V

MAX

RTD

CAT

MEAS

MAX

300V

MAX

30V

–

Black

Common

gj16f.eps

Figure 16. Electrical Sourcing Connections

741B/743B

Users Manual

Simulating a 4 to 20 mA Transmitter

You can configure the calibrator as a load on a current loop through the SOURCE mA function. When you press the M key in SOURCE mode, the display prompts you to select

Transmitter

. When you Source mA the calibrator is sourcing current, and when you the calibrator is sourcing a variable resistance to regulate current to the specified value. Connect an external loop supply to the positive (top) mA jack as shown in Figure 17.

Also see “Transmitter Mode,” in which the calibrator can be set up to temporarily take the place of a two-wire process transmitter.

Source mA or Simulate

Simulate Transmitter

Note

DOCUMENTING PROCESS CALIBRATOR

743B

MEAS

SETUP

Loop

Power

Supply

SOURCE

Red

+24

789

456

123

mA mA

RTD

SOURCE

30V MAX

RTD

RANGE

CLEAR

(ZERO)

ENTER

RTD

CAT

MEAS

300V

MAX

30V MAX

Documenting Process Calibrator

Using Source Mode

Black

UUT

–

ki17c.eps

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

741B/743B

Users Manual

Supplying Loop Power

The calibrator supplies loop power at 28V or 24V dc. The 28V setting supplies enough current for two or three 4-20 mA devices on the loop in addition to the two-wire transmitter but uses more battery power. Use the 24V setting if there are two or fewer devices on the loop in addition to the two-wire transmitter. (Each device on a typical 4- to 20-mA loop has a resistance of 250Ω, thus dropping 5V at 20 mA. A typical transmitter must have 11V minimum in order to operate correctly at its top end.)

When loop power is enabled, the mA (middle column) jacks are dedicated to sourcing and measuring the current loop. This means that the SOURCE mA, measure RTD, and measure functions are not available (see Table 8, later in this manual.)

Ω

Connect the calibrator in series with the instrument current loop as Figure 18 shows. Proceed as follows to source loop power:

1. Press s for Setup mode.

2. Note that following

Loop Power, Disabled is

highlighted. Press e.

3. Use the u or d arrow keys to select

24V

or Enabled 28V.

Enabled

4. Press e.

5. Press the Done softkey.

DOCUMENTING PROCESS CALIBRATOR

743B

MEAS

SETUP

SOURCE

789

456

123

mA mA

RTD

SOURCE

30V MAX

RTD

RANGE

CLEAR

(ZERO)

ENTER

RTD

CAT

MEAS

300V

MAX

30V MAX

Red

Documenting Process Calibrator

Using Source Mode

TEST DC PWR

+–+–

–+

Black

ki18c.eps

Figure 18. Connections for Supplying Loop Power

741B/743B

Users Manual

Sourcing Pressure

The calibrator provides a source pressure display function that requires the use of an external pressure hand pump. Use this function to calibrate instruments that require a pressure source or differential pressure measurement. See Figures 19 and 34 for information about that application.

Many ranges and types of pressure modules are

To use the source pressure display, see Figure 19 and proceed as follows:

Warning

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

Caution

To avoid mechanically damaging the pressure module, never apply more than 10 ft.-lb. of torque between the pressure module fittings or between the fittings and the body of the module. Always apply appropriate torque between the pressure module fitting and connecting fittings or adapters.

To avoid damaging the pressure module from overpressure, never apply pressure above the rated maximum printed on the pressure module.

Documenting Process Calibrator

Using Source Mode

1. Connect a pressure module and pressure source to the calibrator as Figure 19 shows. The threads

on the pressure modules accept ¼ NPT fittings. Use the supplied ¼ NPT to ¼ ISO adapter if necessary.

2. If necessary, press M for SOURCE mode.

3. Press p. The calibrator automatically senses which pressure module is attached and sets its range accordingly.

5. Pressurize the pressure line with the pressure source to the desired level as shown on the display.

6. If desired, you can change pressure display units to psi, mHg, inHg, mH

O, bar, g/cm2, or Pa. Metric units (kPa,

ftH

O, inH2O, inH2O@60°F,

mmHg, etc.) are shown in Setup mode in their

base units (Pa, mHg, etc.). Change the pressure display units as follows:

a. Press s. b. Press

Next Page twice.

c. Press e with the cursor on Pressure

Units

d. Select the pressure units with the u or d

keys. e. Press e. f. Press the

Done softkey.

741B/743B

Users Manual

V RTD

30V

MAX

DOCUMENTING PROCESS CALIBRATOR

743B

MEAS

SOURCE

789

456

123

mA mA

SOURCE

30V MAX

Pressure

Module

Hand

Pump

SETUP

RTD

RANGE

CLEAR

(ZERO)

ENTER

RTD

CAT

MEAS

300V

MAX

30V

MAX

ki19c.eps

Figure 19. Connections for Sourcing Pressure

Documenting Process Calibrator

Using Source Mode

Simulating Thermocouples

Note

Refer to “Measuring Temperature” earlier in the manual for a table of data relating to thermocouple types supported by the calibrator.

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

the other. Do not try to force a miniplug in the wrong polarization

Proceed as follows to simulate a thermocouple:

1. Attach the thermocouple leads to the appropriate TC miniplug, then to the TC input/output as Figure 13 shows.

2. If necessary, press M for SOURCE mode.

3. Press t for the display that prompts you to enter thermocouple type.

4. Press the u or d key followed by e to select the desired thermocouple type.

. Figure 20 shows this connection.

One pin is wider than

5. Press the u or d key followed by e to

Linear T (default), or Linear mV, (for

select calibrating a temperature transmitter that responds linearly to millivolt inputs).

6. Enter the temperature you want to simulate as prompted by the display and press e.

Note

If you use copper wire instead of thermocouple wire, the reference junction is no longer inside the calibrator. The reference junction is moved to the instrument (transmitter, indicator, controller, etc.) input terminals. You must measure this external reference temperature accurately and enter

and

Ref.

it into the calibrator. Do this by pressing and setting

Junc. Temp.

Ref. Junc. Compensat

After you enter the external reference temperature, the calibrator corrects all voltages to compensate for this new reference junction temperature.

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Users Manual

Simulating RTDs

Note

Refer to Table 6 for information about RTD (Resistance-Temperature Detector) types supported by the calibrator.

Connect the calibrator to the instrument under test as shown in Figure 21. Proceed as follows to simulate an RTD (Resistance-Temperature Detector):

1. If necessary, press M for SOURCE mode.

2. Press t until the select RTD type display is showing.

3. Press the u or d keys followed by e to select the desired RTD type.

4. Enter the temperature you want to simulate as prompted by the display, then press e.

DOCUMENTING PROCESS CALIBRATOR

743B

Documenting Process Calibrator

Using Source Mode

Color depends

TEST DC PWR

++–

on type of TC

MEAS

SOURCE

789

456

123

mA mA

RTD

SOURCE

30V MAX

SETUP

RTD

RANGE

CLEAR

(ZERO)

ENTER

RTD

CAT

MEAS

300V

MAX

30V MAX

–+

TC Miniplug

Figure 20. Connections for Simulating a Thermocouple

ki20c.eps

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RTD

Transmitter

V RTD

MAX

Black

mA mA

SOURCE

30V

MAX

RTD

CAT

MEAS

MAX

300V

MAX

30V

-PS +PS M

-IN

+IN

Red

gj21f.eps

Figure 21. Connections for Simulating an RTD

Documenting Process Calibrator

Using Source Mode

Sourcing in Percent of Scale

This feature lets you scale the output in accordance with the input requirements of a particular process

instrument’s response. Percent of scale works for linear-responding transmitters, or square-root responding transmitters.

Linear-Responding Transmitters

1. If necessary, press M for SOURCE mode.

2. Select a source function (m, v, q, t, or p) as previously described and enter a value.

3. Press the

4. Use the numeric keypad to enter the 0% of scale value (

5. Press e.

6. Use the numeric keypad to enter the 100% of scale value(

7. Leave Mode set to %.

8. Press the Done softkey.

Scale softkey.

0% Value).

100% Value).

Percent of scale remains in effect until you press the

Scale softkey again or you change the source

function.

Square-Law Process Variables

When you select √ within scaling, the calibrator output value is the percent value entered, squared, and converted to engineering units.

1. If necessary, press M for SOURCE mode.

2. Select a source function (m, v, q, t, or p) as previously described.

3. Press the

4. Use the numeric keypad to enter the 0% of scale value (

5. Press e.

6. Use the numeric keypad to enter the 100% of scale value(

7. Set Mode to √.

8. Press e.

Scale softkey.

0% Value).

100% Value).

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Users Manual

9. Press the Percent of scale remains in effect until you press the

Scale softkey again.

Done softkey.

Stepping and Ramping the Output Value

Two features are available for adjusting the value of source functions, except pressure, which requires that you use an external pressure source:

• Stepping the output manually with the keys, or in automatic mode.

• Ramping the output with optional continuity or V trip detect.

u and d

Using Manual Step

The manual Step feature allows you to select a step size in engineering units (mV, V, mA, °C, etc.) or %

of scale. Stepping the output in % of scale is useful for quickly jumping between 0% and 100% (set step size = 100%) or 0-50-100% (set step size = 50%). Stepping works in SOURCE and in MEASURE/SOURCE modes. Proceed as follows to select a step size:

1. Refer to the appropriate “Using Source Mode” subheading earlier in this manual (e.g., “Sourcing Electrical Parameters”) and connect the calibrator to the circuit to be tested.

2. If necessary, press M for SOURCE mode.

3. Set the calibrator for the desired source value.

4. If you want to step the source value in % of scale, set the % of scale value as described previously under “Sourcing in Percent of Scale.”

5. Press the

6. Use the numeric keypad to enter the step size in the units shown on the display.

7. Press the

8. Now you can adjust the output in steps by pressing the u and d keys.

Step softkey.

Done softkey.

Documenting Process Calibrator

Using Source Mode

Using Auto Step

To have the calibrator make a sequence of steps automatically, either once through the sequence or repetitively, proceed as follows:

1. Refer to the appropriate “Using Source Mode”

subheading earlier in this manual (e.g., “Sourcing Electrical Parameters”) and connect the calibrator to the circuit to be tested.

2. If necessary, press M for SOURCE mode.

3. Set the calibrator for the desired source value.

4. If you want to step the source value in % of scale, set the % of scale value as described previously under “Sourcing in Percent of Scale.”

5. Press the

6. Press the Auto Step softkey.

Step softkey.

7. Select values for the following parameters as you are prompted by the display:

Starting point (in units or % of scale)

•

Ending point

•

Number of steps

•

Time per step

•

Single shot or continuous repetition

•

Ramp pattern if continuous

•

Start delay

•

8. To start automatic stepping, press the softkey. The softkey label changes to Stop Step.

9. To stop automatic stepping, press the Stop Step softkey.

10. Press the Done softkey to resume normal operation.

Start Step

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Ramping the Output

Ramping sweeps the source up or down in value. Use the ramp feature to check a limit switch or alarm, or any time you want a smoothly increasing or decreasing output function. You can set the calibrator to ramp up or down in engineering units (mV, V, mA, °C, etc.) or % of scale.

During ramping, the output is adjusted 4 times per second. The size of the steps is determined by your choices of endpoints and ramp time. For example, if you set the calibrator to ramp from 1 mV to 1V over 10 seconds, the output is adjusted in approximately 25 mV steps.

Ramping continues until the selected limit is reached, or until an optional trip condition is encountered. The optional trip detect works as follows: during ramping, the calibrator checks for either a 1V change in dc voltage or a change in continuity status (

Short) from one ¼ second interval to the next.

Open or

Proceed as follows to ramp (i.e., sweep the source):

1. Refer to the appropriate heading earlier in this manual (e.g., “Sourcing Electrical Parameters”) and connect the calibrator to the circuit to be tested. Figure 22 shows an example.

2. To automatically stop ramping if a trip condition is detected, connect a voltage trip circuit to the V MEAS jacks or a continuity trip circuit to the mA

RTD MEAS jacks. (Continuity detection is not

Ω

available when sourcing current.)

3. If necessary, press M for SOURCE mode.

4. Set the calibrator for the desired source value as previously described.

5. If you want to ramp the output in % of scale, set % of scale as described previously under “Sourcing in Percent of Scale.”

6. Press the

More Choices softkey.

Documenting Process Calibrator

Using Source Mode

7. Press the

Ramp softkey. The display changes to

the following:

gj41s.eps

8. Fill in the parameters as prompted. Enter the

Start Value, End Value, and Ramp Time.

9. To automatically stop ramping if a trip condition is detected, set the

Voltage or Continuity as the trip function.

select

Trip Detect to Enabled, and

10. Press the

Done softkey. Note the RAMP

annunciator next to SOURCE at the top of the display.

11. Select a low-to-high ramp or a high-to-low ramp with the

Ramp Up/Down softkey.

12. To start ramping, press the Start Ramp softkey.

13. Ramping continues until a trip is detected (if enabled), the ramp time expires, or you press

Stop Ramp softkey.

the

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743B

MEAS

SOURCE

789

456

123

mA mA

RTD

SOURCE

30V MAX

DOCUMENTING PROCESS CALIBRATOR

SETUP

RTD

RANGE

CLEAR

(ZERO)

ENTER

RTD

CAT

MEAS

300V

MAX

30V

MAX

Voltage Trip Detect

Trip Relay

Output

–+

Red

Input

4 – 20 mA

+–

Black

Red

Source mA

Figure 22. Checking a Relay Output Trip Alarm

Black

ki22c.eps

Documenting Process Calibrator

Simultaneous Measure/Source

Use the MEASURE/SOURCE mode to calibrate or emulate a process instrument. Press M so that a split screen display appears as shown below.

gj42s.eps

Table 7 shows the functions you can use simultaneously when Loop Power is disabled. Table 8 shows the functions you can use simultaneously when Loop Power is enabled.

You can use the

Step or Auto Step features to adjust

the output in MEASURE/SOURCE mode, or you can use the calibration routine provided when you press

As Found softkey.

the

The following two softkeys displayed in MEASURE/SOURCE mode are for use in calibrating a process instrument.

As Found, which lets you set up a calibration

• routine to obtain and record as found data.

Auto Step, which lets you set up the calibrator for

• auto-stepping, as previously described.

Instructions for calibrating a process instrument follow.

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

Measure Function Source Function

dc V mA Freq Ω TC RTD Pressure

dc V ••••• • • mA • ••• • • ac V ••••• • • Frequency (≥20 Hz) ••••• • • Low Frequency (<20 Hz)

Ω • ••• • •

Continuity • ••• • • TC •••• • • RTD • ••• • • 3W RTD • ••• • • 4W RTD • ••• • • Pressure ••••• •

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

Measure Function Source Function

dc V mA Freq Ω TC RTD Pressure

dc V • • • • • • mA • • • • • • ac V • • • • • • Frequency (≥20 Hz) • • • • • • TC • • • • • Pressure • •• • •

Documenting Process Calibrator

Simultaneous Measure/Source

741B/743B

Users Manual

Calibrating a Process Instrument

When the calibrator is in simultaneous MEASURE/SOURCE mode, a built-in calibration routine is activated when you press the softkey. (As Found data are the test results showing the condition of a transmitter before it is calibrated.) Additionally, the Model 743 runs tasks (procedures) that are developed using a host computer and compatible application software.

Caution

Calibration of pulsed or multiplexed RTD instruments with settling times of less than 100 ms may result in errors, and is not recommended.

Generating “As Found” Test Data

The following example shows how to generate

data for a thermocouple temperature

found

transmitter. The way you set up the template for the procedure is similar for Delta-P and 1 Pt. and 2 Pt. Switch tests.

As Found

In this case the calibrator is simulating the output of a thermocouple and measuring the resulting current from the transmitter. Other transmitters use this same method. Just go back to MEASUREMENT or SOURCE mode and change the operating parameters before you press

1. Connect the test leads to the instrument under test as shown in Figure 23. The connections simulate a thermocouple and measure the corresponding output current.

2. If necessary, press M for MEASURE mode.

3. Press m.

4. Press M for SOURCE mode.

5. Press t.

6. Use the u and d keys to select the thermocouple type, then press e.

7. Enter a source value, for example 100 degrees, then e.

As Found.

Documenting Process Calibrator

Calibrating a Process Instrument

8. Press

M for MEASURE/SOURCE mode. The

display changes to:

9. Press the As Found softkey, followed by the

Instrument softkey. The display changes to:

gj42s.eps

10. Enter values for 0% and 100% of 4.0 mA and

20.0 mA, respectively. Set

Tolerance to 0.5% of

span. (Use other values if necessary for your application.)

gj44s.eps

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Users Manual

DOCUMENTING PROCESS CALIBRATOR

743B

MEAS

SOURCE

789

456

123

mA mA

RTD

SOURCE

30V

MAX

30V MAX

Color depends

on type of TC

SETUP

RTD

RANGE

CLEAR

(ZERO)

ENTER

RTD

CAT

MEAS

300V MAX

30V MAX

Red

Miniplug

Black

–+

Figure 23. Calibrating a Thermocouple Temperature Transmitter

TEST DC PWR

++–

–+

Circuit Wiring

Power

Supply

Original

ki23c.eps

Documenting Process Calibrator

Calibrating a Process Instrument

11. If the process instrument needs more time to

settle than the calibrator’s normal settling time (about 2 seconds) at each new stimulus level, enter that time in seconds for

Delay.

12. Use the arrow keys to move the cursor down to

0% and 100% values for SOURCE

enter temperature. Our example uses 100°C and 300°C.

13. If the instrument calibration procedure requires you to enter either the measurement value or source value by hand at each step, press the

User Value softkey, for “user entered values.” Custom Units lets you define your own units such

as “PH.” See “Creating Custom Measurement Units,” earlier in this manual for an example.

When you use custom units, the

w symbol

appears next to the value on the display and in results.

Press the

Done softkey after you have

programmed your custom unit.

14. The

Strategy is the number of test points and

which test points are performed rising and falling

in percent of scale. Our example uses five points (0%, 25%, 50%, 75%, and 100%), rising only. Rising is indicated by the up arrow on the display. Change to another test strategy by pressing e on this line. A list of strategies appears from which to choose. Select one, then press

Done.

15. When you finish selecting the calibration parameters, the display appears as follows:

gj45s.eps

741B/743B

Users Manual

16. Press the

Done softkey to accept the calibration

parameters. The display changes to:

17. You now have the choice of starting an automatic test or stepping through the test points manually. Press the Auto Test softkey to have the calibrator run through the tests automatically.

Abort gets you out of the calibration procedure.)

( The tests begin at the zero point, sourcing the correct temperature (a voltage) and measuring the corresponding current from the transmitter.

As soon as a measurement has settled and been captured, the calibrator moves to the next step. Because the calibrator waits for the

gj46s.eps

measurement to stop changing, the Auto Test works correctly for instruments with built-in damping. The error of the expected measured value is shown in the top left of the measure window.

18. The calibrator moves to the remaining set of points. For temperature and electrical parameter calibration, the points are done automatically. If you are sourcing pressure, the calibrator pauses at each step for you to adjust the pressure source. When the tests are complete, an error summary table such as the following is displayed.

gj47s.eps

Documenting Process Calibrator

Calibrating a Process Instrument

19. In the results summary test, failures are highlighted. An adjustment is required in this example because three tests show failures. The

failures were outside the ±0.5% tolerance that we selected.

20. Either press the

Abort softkey to delete the data and start

or the

Done softkey to save the data,

over. You can see the saved data entry and recall the

table for later viewing through the

Memory

softkey during normal operation. With

Review

Model 743 you can upload this data to a host computer running compatible application software.

Adjusting the Transmitter

Proceed as follows to make the calibration adjustments to the transmitter. (Always refer to the transmitter manufacturer’s instructions to locate the adjustment controls and connection points for your transmitter.)

1. Press the summary.

2. Press the 0% of span (100°C in this example) and displays the following softkeys:

• Go to 100%/Go to 0%

• Go to 50%

• As Left

• Exit Cal

3. Adjust the transmitter output for 4 mA then press the Go to 100% softkey.

Done softkey while viewing the results

Adjust softkey. The calibrator sources

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Users Manual

4. Adjust the transmitter output for 20 mA.

5. If the span was adjusted in step 4, you must go back and repeat steps 3 and 4 until no more adjustment is required.

6. Now check the transmitter at 50%. If it is within specification, your adjustment is complete. If not, adjust the linearity and begin this procedure again at step 3.

“As Left” Test Run

Proceed as follows to generate and record data for the thermocouple temperature transmitter you have just adjusted.

1. Press the

As Left softkey to record

2. Press the Auto Test softkey to begin an automatic sequence through all the test points, or you can step through the tests manually.

3. When the tests are complete, observe the error summary table, such as the following.

as left

data.

gj48s.eps

An asterisk (*) next to a measure or source value indicates an unsettled value (

g annunciator)

when the measurement was taken.

4. If all the results are within specification, as they are this time, press the memory is made for

Done softkey. An entry in

as left

data.

Documenting Process Calibrator

Calibrating a Process Instrument

Test Comments

Model 743B runs tasks (custom procedures) that are developed using a host computer and compatible application software. A task may display a list of proposed comments during execution. When the comment list is displayed, select a comment to be saved with the test results by pressing the u and d keys followed by e.

Calibrating a Delta-Pressure Flow Instrument

The procedure to calibrate a √ instrument is the same as for other instruments, as just described, with the following differences:

• Source square-root is automatically enabled after the complete.

As Found calibration template is

• Measure/Source displays are in engineering units.

• The measurement percentage is automatically

corrected for the transmitter’s square-root response, and is used to compute instrument errors.

You select the √ instrument procedure in a menu after you press the

As Found softkey.

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Users Manual

Calibrating a Limit Switch

The procedure to calibrate a limit switch also uses the As Found and As Left calibration templates. Select either the

1 Pt. Switch or 2 Pt. Switch

procedure in a menu after you press the As Found softkey. Figure 24 defines the terminology used in calibrating limit switches.

The template to set up the limit switch procedure lets you select the following parameters:

• Switch sense (normally open or closed).

• For each setpoint:

• Setpoint value.

• Setpoint tolerance.

• High limit or low limit.

• Minimum deadband.

• Maximum deadband.

Switch B

Deadband

Process Variable

Switch A

Deadband

Switch A: Low Limit Switch B: High Limit

Open

Switch B

Closed

Switch A

Open

Switch B Setpoint

Reset

Switch A Setpoint

gj24f.eps

Figure 24. Limit Switch Terminology

Documenting Process Calibrator

Calibrating a Process Instrument

The procedure for testing a pressure limit switch follows. The switch in this example sets at a high limit of 10 psi. The set state is a closed switch contact. For pressure switches, you use the

Manual Test

choice. For testing switches that do not require sourcing pressure, you can use the

Auto Test choice.

1. Connect the test leads between the pressure switch contact output and the mA Ω RTD (middle) jacks on the calibrator.

2. Connect the pressure module to the calibrator, and connect a pressure line to the limit switch. Leave the pressure line vented to atmosphere.

3. If necessary, press M for MEASURE mode.

4. Press q q for the continuity measure function.

5. Press M for SOURCE mode.

6. Press p for the pressure source function.

7. Press c to zero the pressure module.

8. Press M.

9. Press the

As Found softkey.

10. Highlight 1 Pt. Switch Test from the menu and press e.

11. Press e to modify the parameters for Setpoint 1.

12. Make the following selections:

Setpoint 1 = 10.000 psi Setpoint Type = High Set State = Short

13. Press the Done softkey.

14. Set the Tolerance to 0.5 psi.

15. The next parameters, Deadband Min and

Deadband Max, are optional. Do not set them in

this example.

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Users Manual

16. Set

Trip Function to Trip Cont by cycling through

the choices with the e key.

17. Press the

Done softkey.

18. Press the Manual Test softkey.

19. Close the pressure line vent and slowly bring the

pressure up to the trip point.

20. When the switch sets, slowly bring the pressure back down until the switch resets. You can repeat this cycle as many times as you want.

21. Press the

Done softkey and view the results.

22. Press the Done softkey and if desired, enter Tag,

S/N,

and/or ID.

23. Press the Done softkey.

24. Now press the Adjust softkey if you want to adjust the limit switch and test it again.

25. Use the softkeys to control the calibrator, and adjust the limit switch as necessary.

26. Press the

Done softkey.

27. Press the As Left softkey to run the test again with the same parameters. Results from the As Found and As Left tests are saved in the calibrator memory for later viewing, or in the case of the 743B, uploading.

The procedure for limit switches that respond to other parameters work similarly. When you do a 2 Pt. Limit Switch Test, you simply follow the prompts on the display for testing the first switch, changing test leads, and testing the second limit switch.

Documenting Process Calibrator

Transmitter Mode

You can set up the calibrator so that a varying input (MEASURE) controls the output (SOURCE), like a

transmitter. This is called “Transmitter mode.” In Transmitter mode, the calibrator can be temporarily used as a substitute for a defective or suspect transmitter.

Warning

Do not use Transmitter mode in any environment that requires intrinsic safe equipment and practices.

Caution

Transmitter mode is for diagnostic purposes only. Use a fresh battery. Do not use the calibrator in place of a transmitter for extended periods.

To set up the calibrator to emulate a transmitter, proceed as follows:

1. Disconnect the control bus wires from the transmitter output (loop current or dc V control signal).

2. Connect test leads from the appropriate calibrator SOURCE jacks to the control wires in place of the transmitter.

3. Disconnect the process input (e.g., thermocouple) from the transmitter.

4. Connect the process input to the appropriate calibrator MEASURE jacks or input connector.

5. If necessary, press M for MEASURE mode.

6. Press the appropriate function key for the process input.

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Users Manual

7. Press

M for SOURCE mode.

8. Press the appropriate function key for the control output (e.g., v or m). If the transmitter is connected to a current loop that has a power supply, select

Simulate Transmitter for the

current output choice.

9. Select a source value, e.g., 4 mA.

10. Press M for MEASURE/SOURCE mode.

11. Press

More Choices until the Transmitter Mode

softkey appears.

12. Press the Transmitter Mode softkey.

13. Set the 0% and 100% values for MEASURE and SOURCE on the display. You can select

Linear

or √ for the transfer function.

14. Press Done.

15. The calibrator is now in Transmitter mode. It is measuring the process input and sourcing the control signal output proportional to the input.

16. To change any of the Transmitter mode parameters, press

Change Setup, and repeat the

process in step 13.

17. To exit Transmitter mode, press the

Abort

softkey.

Memory Operations

Saving Results

As Found/As Left test results are automatically saved at the end of each test routine. Any other time during MEASURE, SOURCE, or MEASURE / SOURCE you can press the display for later review.

Save softkey to save the data on the

Documenting Process Calibrator

Memory Operations

After you press information on the display and shows a saved result index number, the date and time, and the percentage

Save, the calibrator saves the

gj49s.eps

of memory available, as in the following display:

If you want to add information to the saved data, the calibrator has a way for you to do so. If you press the

Continue softkey, the display prompts you to enter

the instrument tag identifier ( number (

S/N), and operator name (ID), as shown in

Tag), instrument serial

the following display:

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Users Manual

gj50s.eps

Enter alpanumeric characters into the highlighted field with the optional bar code wand (743 only) or the calibrator keys.

To enter alphanumeric characters using the calibrator keys, press e with the cursor on the field you would like to change (for example, Tag, above). The display presents you with an alphanumeric entry window as follows:

1. Enter numbers using the numeric keypad, and letters by highlighting the desired character with the u, d, L, and R keys followed by e . Enter a space character by pressing the

Space

softkey, followed by e.

2. When the entry showing at the bottom of the window is what you want, press the

Done

softkey.

gj51s.eps

Documenting Process Calibrator

Memory Operations

Reviewing Memory

Press the More Choices softkey until Review Memory appears, then press the Review Memory softkey to recall and view saved results.

When you press the display changes to:

Press u or d and e or the Go to Result softkey to view a saved result.

Review Memory softkey, the

gj52s.eps

Data Logging (Model 743B Only)

With Model 743B only, you can record a series of measurements for later uploading to a host computer running compatible application software. You can log up to 8000 readings, depending on the reading rate, duration, and how much memory is being used for other things such as tasks or saved results. You enter the reading rate and duration in minutes as shown next.

gj53s.eps

741B/743B

Users Manual

Proceed as follows to log data:

1. If necessary, press

2. Press the

More Choices softkey.

M for MEASURE mode.

3. Press the Log softkey.

4. A list appears from which you select a reading rate (1, 2, 5, 10, 20, 30, or 60 readings per minute). Use the u or d key to select the reading rate.

5. Press e.

6. Press d to move the cursor to

Duration.

7. Use the numeric keypad to enter the duration in minutes, followed by e. The maximum duration will depend on the reading rate and how much memory is available to log data. The table below gives an estimate of the limits for duration, assuming that no memory is being used for other purposes.

Readings/Minute Maximum

Readings

1 8000 133 hours 2 8000 66 hours

5 8000 26 hours 10 8000 13 hours 20 8000 6 hours 30 7980 4 hours 60 7980 2 hours

Caution

A long logging duration can exceed the life of a battery charge. Use a fresh battery and the appropriate duration, or use the optional battery eliminator to avoid losing power during a logging session. If b appears during a log session, the session is terminated and data collected to that point is saved.

Approximate

Duration

Documenting Process Calibrator

Memory Operations

8. After you enter your choice of duration, you can see how much memory that duration would consume. See the

Remaining Memory Used indicates the percentage of

percentage figures on the display.

Memory Used and Memory

available memory that will be used by the specified log.

Memory Remaining indicates the

percentage of memory that will remain unused after logging is complete.

9. Press the

Done softkey. The display changes to:

gj54s.eps

10. Note the LOG annunciator next to MEASURE. Press the

Start Logging softkey to start taking

data.

11. The calibrator will continue storing data points until the duration has elapsed, or until you press

Done softkey. Either way of terminating

the logging causes the calibrator to save the data as a memory item that can be uploaded to a host computer running compatible application software.

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Recording Min and Max Measurements

You can set the display to record and show the maximum and minimum readings. Min and Max readings are always undamped, even if Dampen is On. Press the

Min Max softkey to turn on this feature. Press the

the c key to reset the Min Max registers. Press the

Min Max softkey again to revert to the normal display.

The following figure shows the display with Min Max on:

More Choices softkey twice, then press

gj55s.eps

Running a Preloaded Task (743B only)

Press the More Choices softkey until the Tasks softkey appear, then press Tasks to view the list of tasks (procedures) downloaded from a host computer. Tasks are 743B calibrator configurations, saved with a procedure name, for example the type and manufacturer of a specific transmitter. A task configures the calibrator for transmitter calibration with all the calibration parameters (source and measure functions, 0% and 100% levels, test strategy) predefined.

While the task is controlling the calibrator, the

Continue softkey becomes Continue Task.

Clearing Memory

In Setup mode, highlight the Clear Memory choice and press e to clear all the memory:

• Saved results

• Min Max data

• Log data sets (Model 743 only)

A confirmation message appears so that you do not inadvertently erase the memory.

Using the Built-in Calculator

For solving mathematical equations that involve the

calibrator’s source or measured value, you can use the calibrator’s built-in calculator. The present measure and source values, including units, are always available to be inserted into an equation at a single keystroke. The calibrator keeps measuring and sourcing during calculator operation.

Start the calculator from the SOURCE, MEASURE, or MEASURE/SOURCE mode by pressing the softkey. You may have to press More Choices to get

Calc softkey.

the After you press Calc, the display, number keys, and

keys with calculator functions (

r, L, R, u,

Calc

d, and e) become an algebraic-entry

calculator.

Done when you want to resume normal

Press calibrator operation.

Documenting Process Calibrator

Using the Built-in Calculator

Saving to and Recalling from the Registers

When the calibrator is in calculator mode, the top half of the display shows three register names and their contents:

MEASURE (the present measured value)

•

SOURCE (the present sourced value)

•

Insert the contents of any register into a calculation by pressing the for the desired register.

Store to copy the number from the calculator

Press display (lower half) into save the number for later use, or into

Recall softkey followed by the softkey

SOURCE.

741B/743B

Users Manual

Using the Calculator to Set the Source Value

When you store to SOURCE, the calibrator presents you with a choice of unit multipliers when appropriate (e.g., mV or V), then starts sourcing that value. The calibrator ignores attempts to store out-of-range values to

SOURCE.

Quick Guide to Applications

The following figures show test lead connections and which calibrator function to use for many different applications.

Documenting Process Calibrator

Quick Guide to Applications

Measure V

DOCUMENTING PROCESS CALIBRATOR

743B

DOCUMENTING PROCESS CALIBRATOR

743B

0 to 1V dc

Input

Red

MEAS

SOURCE

789

456

123

mA mA

V RTD

SOURCE

30V

MAX

30V MAX

SETUP

RTD

CLEAR

(ZERO)

RANGE

Red

Circuit

ENTER

RTD

CAT

MEAS

300V

MAX

30V

MAX

250

Ω

Black

MEAS

SOURCE

789

456

123

mA mA

V RTD

SOURCE

30V

MAX

30V MAX

SETUP

RTD

RANGE

CLEAR

(ZERO)

ENTER

RTD

CAT

MEAS

300V

MAX

30V MAX

Black

ki25c.eps

Figure 25. Calibrating a Chart Recorder

ki26c.eps

Figure 26. Measuring Voltage Drop

741B/743B

Users Manual

789

456

123

V RTD

30V

MAX

DOCUMENTING PROCESS CALIBRATOR

743B

MEAS

SOURCE

mA mA

SOURCE

30V

MAX

Measure V

SETUP

RTD

RANGE

CLEAR

(ZERO)

ENTER

RTD

CAT

MEAS

300V

MAX

30V MAX

RED

BLACK

ki27c.eps

Figure 27. Monitoring AC Line Voltage and Frequency

Documenting Process Calibrator

Quick Guide to Applications

743B

MEAS

SOURCE

789

456

123

mA mA

V RTD

SOURCE

30V MAX

DOCUMENTING PROCESS CALIBRATOR

SETUP

RTD

RANGE

CLEAR

(ZERO)

ENTER

RTD

CAT

MEAS

300V

MAX

30V MAX

Measure Pressure Source mA Loop Power Disabled

Pressure

Module

Red

SIGNAL

–

TEST

Black

ki28c.eps

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

741B/743B

Users Manual

Measure mA Loop Power Disabled

Red

TEST DC PWR

++–

–+

Original

Circuit Wiring

Power

–+

Supply

MEAS

SOURCE

789

456

123

mA mA

RTD

SOURCE

30V

MAX

30V MAX

DOCUMENTING PROCESS CALIBRATOR

743B

SETUP

CLEAR

RTD

CAT

MEAS

30V MAX

RTD

RANGE

(ZERO)

ENTER

300V

MAX

Black

ki29c.eps

Figure 29. Measuring the Output Current of a Transmitter

Documenting Process Calibrator

Quick Guide to Applications

DOCUMENTING PROCESS CALIBRATOR

743B

MEAS

SOURCE

789

456

123

mA mA

V RTD

SOURCE

30V MAX

30V

MAX

SETUP

RTD

RANGE

CLEAR

(ZERO)

ENTER

RTD

CAT

MEAS

300V

MAX

30V MAX

Black

Figure 30. Measuring a Precision Resistor

Measure Resistance

Red

ki30c.eps

Source

Resistance

DOCUMENTING PROCESS CALIBRATOR

743B

Circuit

Red

MEAS

SOURCE

789

456

123

mA mA

V RTD

SOURCE

30V

MAX

30V MAX

SETUP

RTD

RANGE

CLEAR

(ZERO)

ENTER

RTD

CAT

MEAS

300V

MAX

30V

MAX

Black

ki31c.eps

Figure 31. Sourcing Resistance

Fluke 743B, 741B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Users Manual

LIMITED WARRANTY & LIMITATION OF LIABILITY

Table of Contents

List of Tables

List of Figures

Introduction

Standard Equipment

Safety Information

Getting Started Exercise

Operating Features

Input and Output Jacks

Keys

Display

Setting Up the Calibrator

Using the Strap and Bail

Charging the Battery

Battery Life

Preserving Battery Life

Using the Optional Battery Eliminator

Selecting the Display Language

Adjusting the Display Contrast

Displaying the Date and Time

Using the Backlight

Personalizing the Calibrator

Using Measure Mode

Measurement Ranges

Measuring Electrical Parameters

Testing Continuity

Measuring Pressure

Measuring Temperature

Using Thermocouples

Using Resistance-Temperature Detectors (RTDs)

Measurements in Percent of Scale

Linear-Output Transmitters

Square-Law Process Variables

Customizing mV Input Units

Damping Your Measurements

Using Source Mode

Sourcing Electrical Parameters

Simulating a 4 to 20 mA Transmitter

Supplying Loop Power

Sourcing Pressure

Simulating Thermocouples

Simulating RTDs

Sourcing in Percent of Scale

Linear-Responding Transmitters

Square-Law Process Variables

Stepping and Ramping the Output Value

Using Manual Step

Using Auto Step

Ramping the Output

Simultaneous Measure/Source

Calibrating a Process Instrument

Adjusting the Transmitter

Test Comments

Calibrating a Delta-Pressure Flow Instrument

Calibrating a Limit Switch

Transmitter Mode

Memory Operations

Saving Results

Reviewing Memory

Data Logging (Model 743B Only)

Recording Min and Max Measurements

Running a Preloaded Task (743B only)

Using the Built-in Calculator

Saving to and Recalling from the Registers

Using the Calculator to Set the Source Value

Quick Guide to Applications