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

Measuring an RTD

To measure an RTD, proceed as follows:

1. Press O to 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

4. Press

R to select the desired RTD type.
[ 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.

INPUT

4W 3W

30V

MAX

NC NC

30V

MAX

2W 3W 4W

OUTPUT

30V

MAX

3W4W

RTD

kg02f.eps

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.

Replacing the Battery

When the B symbol appears on the display, replace the
battery with a 9 V alkaline battery.

it07f.eps

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.

F1

F2

Snaps

kg08f.eps

Replacement Parts and Accessories

Replacement Parts

Item Description PN or

Model

no.

Qty.

BT1 9V battery, ANSI/NEDA 1604A or

IEC 6LR61

CG81Y Holster, Yellow CG81Y 1

W F1,F2 Fuse, 125 mA, 250V fast 686527 2

MP85 Case top 620192 1

MP86 Case bottom 620168 1

H2, 3, 4 Case screw 832246 3

MP89, 90 Non-skid foot 824466 2

MP8 O-ring for input/output receptacle 831933 1

MP92 Battery door 609930 1

H5, 6 Battery door fasteners 948609 2

S1 Keypad 687084 1

- 712 Instruction Sheet 650280 1

- Test lead, red 688051 2

- Test lead, black 688066 2

- 71X Series Calibration Manual 686540 Option

614487 1

MP8

BT1

MP86

H2, 3, 4

MP85

S1

F2

F1

H5, 6

Instruction

Sheet

Test Lead Set

MP92

Holster

MP89, 90

kg10c.eps

Specifications

Specifications are based on a one year calibration cycle and
apply for ambient temperature from +18°C to +28°C unless
stated otherwise.

Note

Specifications on this Instruction Sheet apply to the 712
RTD Calibrators with serial number 7676001 or above.

Ohms Specifications

Ohms
Range

400.00Ω

400.0Ω to

1500.0Ω

1500.0Ω to

3200.0Ω

Allowable Excitation is for Output mode only. It shows the allowable
excitation current from an ohmmeter or RTD measurement device
connected to the calibrator.

Excitation current from 712: 0.2 mA.

Maximum input voltage: 30 V

Input

Accuracy

4-Wire ±Ω

0.1

0.5 0.5 0.05 to 0.8

1 1 0.05 to 0.4

Output

Accuracy

± Ω

0.15 0.1 to 0.5 0.00Ω to

0.1 0.5 to 3.0

Allowable

Excitation (mA)

RTD Specifications

Note

Since ohms input and output units are available, you
can use the calibrator for any unsupported RTD type by
selecting the ohms range and making manual
calculations or referring to tables.

Accuracy (°C)

0.2

0.8

0.3

0.4

0.2

0.2

Allowable
Excitation

(mA)

0.1 to 3.0

0.05 to 0.8

0.05 to 0.4

Input

RTD Type Range °C (°F)

4-Wire 2-Wire

Output

&

3-Wire

Ni 120 -80.0 to 260.0

Pt 100 385 -200.0 to 800.0

Pt 200 385 -200.0 to 250.0

Pt 500 385 -200.0 to 500.0

Pt 1000 385 -200.0 to 100.0

Pt 100 392
(3926)
Pt 100 JIS
(3916)

Addresses pulsed transmitters and PLCs with pulses as short as 5 ms.
Allowable Excitation is for Output mode only. It shows the allowable excitation

current from an ohmmeter or RTD measurement device connected to the
calibrator.

Excitation current from 712: 0.2 mA.
Maximum input voltage: 30 V

(-112.0 to 500.0)

(-328.0 to 1472.0)

(-328.0 to 482.0)

250.0 to 630.0

(482.0 to 1166.0)

(-328.0 to 932.0)

500.0 to 630.0

(932.0 to 1166.0)

(-328.0 to 212.0)

100.0 to 630.0

(212.0 to 1166.0)

-200.0 to 630.0

(-328.0 to 1166.0)

-200.0 to 630.0

(-328.0 to 1166.0)

0.2 0.3 0.2 0.1 to 3.0

0.33 0.5 0.33 0.1 to 3.0

0.2

0.8

0.3

0.4

0.2

0.2

0.3 0.5 0.3 0.1 to 3.0

0.3 0.5 0.3 0.1 to 3.0

0.3

1.6

0.6

0.9

0.4

0.5

General Specifications

Resolution: RTD: 0.1°C, 0.1°F. Ohms: 0.1Ω
Maximum voltage applied between any terminal and earth

ground or between any two terminals: 30 V
Storage temperature: -20°C to 60°C
Operating temperature: -10°C to 55°C
Operating altitude: 3000 meters maximum
Temperature coefficient: 0.005% of ohms range per °C for

temperature ranges -10°C to 18°C and 28°C to 55°C. Ohms
ranges are 400 Ω, 1.5 kΩ, and 3.2 kΩ.

Relative humidity: 95% up to 30°C, 75% up to 40°C, 45% up to
50°C, and 35% up to 55°C

Vibration: Random 2 g, 5 Hz to 500 Hz
Shock: 1 meter drop test
Safety: Certified as compliant to CAN/CSA C22.2 No.

1010.1:1992. Complies with ANSI/ISA S82.01-1994.

Power requirements: Single 9 V battery (ANSI/NEDA 1604A or
IEC 6LR61)

Size: 32 mm H x 87 mm W x 187 mm L (1.25 in H x 3.41 in W x

7.35 in L);

With holster and Flex-Stand: 52 mm H x 98 mm W x 201 mm L
(2.06 in H x 3.86 in W x 7.93 in L)

Weight: 337 g (11.9 oz);
With holster and Flex-Stand: 587 g (20.7 oz)

How to Contact Fluke

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

To contact Fluke, call one of the following telephone numbers:

USA: 1-888-99-FLUKE (1-888-993-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: [phone]
Japan: [phone]
Singapore: [phone]
Anywhere in the world: [phone]

Or, visit Fluke's Web site at www.fluke.com.
To register your product, visit register.fluke.com
Address correspondence to:

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

LIMITED WARRANTY & LIMITATION OF LIABILITY

This Fluke product will be free from defects in material and workmanship
for three years from the date of purchase. This warranty does not cover
fuses, disposable batteries or damage from accident, neglect, misuse or
abnormal conditions of operation or handling. Resellers are not
authorized to extend any other warranty on Fluke’s behalf. To obtain
service during the warranty period, send your defective calibrator to the
nearest Fluke Authorized Service Center with a description of the
problem.

THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER
WARRANTIES, SUCH AS FITNESS FOR A PARTICULAR PURPOSE,
ARE EXPRESSED OR IMPLIED. FLUKE IS NOT LIABLE FOR ANY
SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES
OR LOSSES, ARISING FROM ANY CAUSE OR THEORY. Since some
states or countries do not allow the exclusion or limitation of an implied
warranty or of incidental or consequential damages, this limitation of
liability may not apply to you.