®
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
Earth ground
Fuse
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
J
I
M
W
T
$
P
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
8
7
6
2
3
4
5
kg03f.eps
Display Elements
Element
A
INPUT
B
OUTPUT
C
i
Meaning
Lit when measuring an RTD or resistance
Lit when simulating an RTD or resistance
When simulating an RTD or ohms, the excitation
current from the measuring device under test is too
high. The calibrator output is unspecified.
When an RTD type is selected, one of these is lit
to show the selected scale.
H
D
°C, °F,
Ω
Display Elements (cont.)
Element
E
2W, 3W, 4W
Meaning
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).
The RTD type annunciators (example, Ni 120)
show the selected RTD type.
Lit when the battery is low.
Show the measured or simulated value in degrees
or ohms. When OL appears, the value is out of
range.
Pushbutton Functions
F
RTD TYPES
G
B
H
Numerals
Pushbutton
Function
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
[
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.
R
C
o
2W 3W 4W
[
{
]
}
Simulating an RTD
To simulate an RTD, proceed as follows:
1.
2.
Press
O
to turn on the power.
If the calibrator is in input mode (INPUT on the display),
press INPUT OUTPUT once. Make sure the display shows
OUTPUT.
Press
R
to select the desired RTD type.
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
30V
MAX
30V
MAX
30V
MAX
3.
4.
3W
NC
2W 3W 4W
OUTPUT
NC
Sense
connection
(if needed)
RTD
measurement
device input
Sense
connection
(if needed)
kg01f.eps
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