Fluke 522A/6, Operator'S Manual

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5522A
Operators Manual
4-38
or NONE if the Calibrator is in Standby. When the Reference Source is External,
the display shows the value you entered for external reference.
•
OUTPUT (Temperature Output Device) Selects the temperature device:
thermocouple (tc) or resistance temperature detector (rtd). Select tc.
•
TYPE (Thermocouple Type) Selects the thermocouple type simulated by the
Calibrator. The default is type K. (The 10
μ
V/
°
C and 1 mV/
°
C settings are used
as an accurate output voltage source for user-supplied linearizations.)
Note
The “u” indicator that occasionally appears in the Output Display
indicates an internal adjustment to the measured isothermal block
temperature and is normal. If it appears for more than 10 seconds
(nominal), or if it appears to flash continuously, check to see that you are
not externally heating the thermocouple miniconnector or wires.
How to Set Temperature Simulation (RTD)
RTDs have a characteristic resistance at specific temperatures. The simulated output,
then, is a resistance value based on the selected temperature and type of RTD being
simulated. To toggle the degree reference between the 1968 International Provisional
Temperature Standard (ipts-68) and the 1990 International Temperature Standard (its-90),
see “How to Use the Instrument Setup Menu” earlier in this chapter.
Complete the following procedure to set a simulated RTD temperature output at the front
panel NORMAL terminals. If you make an entry error, press
G
to clear the display,
then reenter the value.
1.
Press
R
to clear any output from the Calibrator.
2. Connect the UUT as described earlier in this chapter under “How to Connect the
Calibrator to a UUT.”
Note
When calibrating Resistance Temperature Detectors (RTDs) using the
three-terminal connection shown in Figure 4-9, be sure the test leads have
identical resistances to cancel any errors due to lead resistance. This can
be accomplished, for example, by using three identical test lead lengths and
identical connector styles.
3. Set the UUT to measure temperature on the desired range.
4. Press the numeric keys and decimal point key to enter the desired temperature output
(maximum 6 numeric keys). For example, 123.456.
5. For an output in
°
C, press the
C
key. For
°
F, press
b
and then the
C
key.
6. The Control Display now shows the amplitude of your temperature output. For
example, 123.456
°
C (below).
nn102f.eps
7. Press
E
. The calibrator clears your entry from the Control Display and copies it
into the Output Display (below is typical).