Simulating Thermocouples - Fluke 741B User Manual

Simulating Thermocouples

Note
Refer to "Measuring Temperature" earlier in the
manual for a table of data relating to
thermocouple types supported by the calibrator.
Connect the calibrator TC input/output to the
instrument under test with thermocouple wire and the
appropriate thermocouple mini-connector (polarized
thermocouple plug with flat, in-line blades spaced 7.9
mm [0.312 in] center to center). One pin is wider than
the other. Do not try to force a miniplug in the wrong
polarization . Figure 20 shows this connection.
Proceed as follows to simulate a thermocouple:
1. Attach the thermocouple leads to the appropriate
TC miniplug, then to the TC input/output as
Figure 13 shows.
2. If necessary, press
3. Press for the display that prompts you to
enter thermocouple type.
4. Press the or key followed by
select the desired thermocouple type.
for SOURCE mode.
to
Documenting Process Calibrator
5. Press the or key followed by
select (default), or
Linear T
calibrating a temperature transmitter that
responds linearly to millivolt inputs).
6. Enter the temperature you want to simulate as
prompted by the display and press
If you use copper wire instead of
thermocouple wire, the reference junction is
no longer inside the calibrator. The reference
junction is moved to the instrument
(transmitter, indicator, controller, etc.) input
terminals. You must measure this external
reference temperature accurately and enter
it into the calibrator. Do this by pressing
and setting
Ref. Junc. Compensat
After you enter the external
Junc. Temp.
reference temperature, the calibrator
corrects all voltages to compensate for this
new reference junction temperature.
Using Source Mode
, (for
Linear mV
.
Note
and
Ref.
to
53