Fluke 712 User manual
712 English Instruction Sheet
Page
1
®
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-Standholster, 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
IPTS-68 curves. Full calibrator specifications are listed at the end
of this instruction sheet.
PN 650280 August 1997
1997 Fluke Corporation. All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.
712 English Instruction Sheet
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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.
Supported RTD Types
RTD Type Temperature Range and
Resolution Allowable
Excitation
(Note 1)
°C°FmA
Ni 120 -80.0 to 260.0 -112.0 to 500.0 0.15 to 2.00
Pt 100 385 -200.0 to 800.0 -328.0 to 1472.0 0.15 to 2.00
Pt 200 385 -200.0 to 630.0 -328.0 to 1166.0 0.15 to 2.00
Pt 500 385 -200.0 to 630.0 -328.0 to 1166.0 0.05 to 0.80
Pt 1000 385 -200.0 to 630.0 -328.0 to 1166.0 0.05 to 0.40
Pt 100 392 -200.0 to 630.0 -328.0 to 1166.0 0.15 to 2.00
Pt 100 JIS -200.0 to 630.0 -328.0 to 1166.0 0.15 to 2.00
Range and Resolution for Ohms
Simulate and Measure
R (Note 2) 15.0 Ωto 400.0 Ω0.15 to 2.00
R 400.0 Ωto 1500.0 Ω0.05 to 0.80
R 1500.0 Ωto 3200.0 Ω0.05 to 0.40
Note 1: This column is for simulate mode only. It shows the allowable
exitation current from an ohmmeter or RTD measurement device
connected to the calibrator.
Note 2: The R annunciator signifies “resistance,” not an RTD type. You
select it the same way as an RTD type.
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
JEarth ground
IFuse
MBattery
WRefer to this instruction sheet for information about
this feature.
TDouble insulated
Conforms to relevant Canadian Standards
Association directives
PConforms to European Union directives
712 English Instruction Sheet
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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).
1
8
7
24
3
56
kg03f.eps
Display Elements
Element Meaning
A
INPUT Lit when measuring an RTD or resistance
B
OUTPUT Lit when simulating an RTD or resistance
C
iHLiL
When simulating an RTD or ohms, the excitation
current from the measuring device under test is too
low. The calibrator output is unspecified.
iH
When 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 When an RTD type is selected, one of these is lit
to show the selected temperature scale.
712 English Instruction Sheet
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Display Elements (cont.)
Element Meaning
E
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).
F
TYPE This and one of the RTD type annunciators
(example, Ni 120) shows the selected RTD type.
G
B
Lit when the battery is low.
H
Numerals 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 R type (ohms), displayed units are
ohms, not degrees.
CPress to toggle temperature scales between
Celsius and Fahrenheit.
Press 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 0.1°or 0.1 Ω. 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).
Notes
If you connect the calibrator to an ohmmeter or RTD
measuring device with auto ranging, you must lock its
range. Select a range that produces an excitation
current in allowed range shown in the first table,
Supported RTD Types.
To simulate an RTD for a pulsed transmitter, wait for the
calibrator output to stabilize. This can take up to 10
seconds.
NC NC
4W 3W
2W 3W 4W
OUTPUT
INPUT
30V
MAX 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 30V
MAX
RTD 3W4W
kg02f.eps
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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10
Replacing the Fuse
WWarning
To avoid personal injury or damage to the
calibrator, use only a 0.125A 250V fast fuse,
Littelfuse2AG.
To determine if fuse F1is blown, put the calibrator in simulate
mode (OUTPUT on the display) and check for proper resistance
at the calibrator’s OUTPUT terminals. An open or very high
impedance suggests fuse F1 is blown.
Replace the fuse as follows:
1. Remove the test leads 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. Replace the fuse with a 0.125 A 250 V fast fuse, Littelfuse
2AG.
6. Fit the top and bottom covers together, engaging the two
snaps. Make sure that the gasket is properly seated.
Reinstall the three screws.
7. Replace the battery door.
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