Fluke 712 Instruction Manual

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
1997-2004 Fluke Corporation. All rights reserved. Printed in U.S.A.

All product names are trademarks of their respective companies.

Safety Information

W Warning

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

I

Earth ground

Fuse

M

W

T

$

P

Battery

Refer to this instruction sheet for information about
this feature.

Double insulated

Conforms to relevant Canadian Standards
Association directives

Conforms to European Union directives

Getting Acquainted with the Calibrator

Press the green O pushbutton to turn the calibrator on and off.
Press the INPUT/OUTPUT pushbutton to select either INPUT
(measuring) or OUTPUT (simulating).

1

2

3

4

8

7

6

5

Display Elements

Element Meaning

A INPUT Lit when measuring an RTD or resistance

B OUTPUT Lit when simulating an RTD or resistance

C

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

When simulating an RTD or ohms, the excitation

i H

current from the measuring device under test is too
high. The calibrator output is unspecified.

to show the selected scale.

kg03f.eps

Display Elements (cont.)

Element Meaning

E 2W, 3W, 4W

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

G B Lit when the battery is low.

H Numerals Show the measured or simulated value in degrees

Pushbutton Function

R

C

o

2W 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).

show the selected RTD type.

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

Pushbutton Functions

Press to select a different RTD type. When you
select the e type (ohms), displayed units are
ohms, not degrees.

Press to toggle temperature scales between
Celsius and Fahrenheit.

Press to select input (measure) or output
(simulate) mode.

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

In measurement mode, press
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.

or { to select

[

Simulating an RTD

To simulate an RTD, proceed as follows:

1. Press O to 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

R to 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).

INPUT

4W 3W

Sense
connection
(if needed)

30V

MAX

NC NC

30V

MAX

2W 3W 4W

OUTPUT

RTD

measurement

device input

30V

MAX

Sense
connection
(if needed)

kg01f.eps