Fluke 712 User manual

712 English Instruction Sheet

Page

712

RTD Calibrator

Instruction Sheet

Introduction

Fluke Model 712 RTD Calibrator is a handheld tool for calibrating

RTD (Resistance Temperature Detector) transmitters, including

most pulsed transmitters. It simulates and measures seven

different types of RTDs, in units of °C or °F. It also simulates and

measures resistance in units of ohms. It does not source and

measure simultaneously.

Your calibrator is supplied with a Flex-Standholster, an

installed 9 V alkaline battery, two sets of test leads, and this

instruction sheet.

If the calibrator is damaged or something is missing, contact the

place of purchase immediately. Contact your Fluke distributor for

information about accessories. To order replacement parts or

spares, see “Replacement Parts.”

The next table lists the RTD types supported by the calibrator,

with their ranges, resolution, and the allowable excitation current

from an RTD measurement device under test. All RTD types use

ITS-90 curves. Full calibrator specifications are listed at the end

of this instruction sheet.

PN 650280 August 1997, Rev.2, 5/04

All product names are trademarks of their respective companies.

712 English Instruction Sheet

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Safety Information

WWarning

To avoid possible electric shock or personal injury:

•Never apply more than 30 V between any two

terminals, or between any terminal and earth

ground.

•Make sure the battery door is closed and

latched before you operate the calibrator.

•Remove test leads from the calibrator before

you open the battery door.

•Do not operate the calibrator if it is damaged.

•Do not operate the calibrator around explosive

gas, vapor, or dust.

When servicing the calibrator, use only specified replacement

parts.

International Symbols

Symbol Meaning

J Earth ground

I Fuse

M Battery

W Refer to this instruction sheet for information about

this feature.

T Double insulated

$ Conforms to relevant Canadian Standards

Association directives

P Conforms to European Union directives

712 English Instruction Sheet

Page

Getting Acquainted with the Calibrator

Press the green Opushbutton to turn the calibrator on and off.

Press the INPUT/OUTPUT pushbutton to select either INPUT

(measuring) or OUTPUT (simulating).

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Display Elements

Element Meaning

AINPUT Lit when measuring an RTD or resistance

BOUTPUT Lit when simulating an RTD or resistance

CiHWhen simulating an RTD or ohms, the excitation

current from the measuring device under test is too

high. The calibrator output is unspecified.

D°C, °F, ΩWhen an RTD type is selected, one of these is lit

to show the selected scale.

712 English Instruction Sheet

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Display Elements (cont.)

Element Meaning

E2W, 3W, 4W When measuring an RTD, one of these is lit to

indicate a two-wire, three-wire, or four-wire

configuration. These annunciators are not used

when simulating an RTD or resistance (output).

FRTD TYPES The RTD type annunciators (example, Ni 120)

show the selected RTD type.

GBLit when the battery is low.

HNumerals Show the measured or simulated value in degrees

or ohms. When OL appears, the value is out of

range.

Pushbutton Functions

Pushbutton Function

RPress to select a different RTD type. When you

select the etype (ohms), displayed units are

ohms, not degrees.

CPress to toggle temperature scales between

Celsius and Fahrenheit.

oPress to select input (measure) or output

(simulate) mode.

2W 3W 4W

[

{

In simulate mode, press to step up or down 50°or

50 Ω.

In measurement mode, press [or {to select

a two-wire, three-wire, or four-wire RTD input

configuration. You will see the corresponding 2W,

3W, or 4W on the display.

]

}Press to scroll up or down display. Hold down to

scroll faster.

712 English Instruction Sheet

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Simulating an RTD

To simulate an RTD, proceed as follows:

1. Press Oto turn on the power.

2. If the calibrator is in input mode (INPUT on the display),

press INPUT OUTPUT once. Make sure the display shows

OUTPUT.

3. Press Rto select the desired RTD type.

4. Connect test leads to the terminals of the RTD measuring

device as shown. Use only the two center outputs (labeled

2W 3W 4W OUTPUT).

NC NC

4W 3W

2W 3W 4W

OUTPUT

INPUT

30V

MAX 30V

MAX

Sense

connection

(if needed)

Sense

connection

(if needed)

RTD

measurement

device input

kg01f.eps

712 English Instruction Sheet

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Measuring an RTD

To measure an RTD, proceed as follows:

1. Press Oto turn on the power.

2. If the calibrator is in simulate mode (OUTPUT on the

display), press INPUT OUTPUT once. Make sure the display

shows INPUT.

3. Press Rto select the desired RTD type.

4. Press [or {to select a two-wire, three-wire, or four-

wire RTD input configuration. Look for the 2W, 3W, or 4W

annunciator on the display to verify that the configuration is

set correctly.

5. Connect test leads to the RTD as shown below. Use two,

three, or four inputs, depending on the setting of 2W, 3W, or

4W on the display.

NC NC

4W 3W

2W 3W 4W

OUTPUT

INPUT

30V

MAX 30V

MAX

RTD

3W4W

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712 English Instruction Sheet

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Maintenance

For maintenance procedures not described in this sheet, contact

a Fluke Service Center.

In Case of Difficulty

•Check the battery and test leads. Replace as necessary.

•Review this sheet to make sure you are using the calibrator

correctly.

If the calibrator needs repair, contact a Fluke Service Center. If

the calibrator is under warranty, see the warranty statement for

terms. If the warranty has lapsed, the calibrator will be repaired

and returned for a fixed fee. Contact a Fluke Service Center for

information and price.

Cleaning

Periodically wipe the case with a damp cloth and detergent; do

not use abrasives or solvents.

Calibration

Calibrate your calibrator once a year to ensure that it performs

according to its specifications. A calibration manual is available

(PN 686540). Call 1-800-526-4731 from the USA and Canada. In

other countries, contact a Fluke Service Center.

712 English Instruction Sheet

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Replacing the Battery

When the Bsymbol appears on the display, replace the

battery with a 9 V alkaline battery.

it07f.eps

712 English Instruction Sheet

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Testing and Replacing the Fuses

WWarning

To avoid personal injury or damage to the

calibrator, use only a 0.125A 250V fast fuse,

Littelfuse2AG.

Fuse F1 protects the input circuit. Fuse F2 protects the output

circuit. Test and replace the fuses using the following procedure:

1. Remove the test leads from the calibrator terminals and turn

the calibrator off.

2. Remove the battery door.

3. Remove the three Phillips-head screws from the case

bottom and turn the case over.

4. Gently lift the top cover from the end nearest the input/output

terminals until it unsnaps from the bottom cover.

5. Gently remove the fuse from its mounting bracket.

6. Measure the resistance of the fuse. An open or high

resistance suggests that the fuse is blown.

7. Replace the blown fuse with a 0.125 A 250 V fast fuse,

Littelfuse2AG.

8. Fit the top and bottom covers together, engaging the two

snaps. Make sure that the keypad and the input/output

terminal gasket are properly seated.

9. Reinstall the three screws.

10. Replace the battery door.

712 English Instruction Sheet

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Snaps

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