Front Panel Operation
Sample Applications 4
4-65
Table 4-6. Thermocouple Performance
Display Readings
Thermocouple Type
[1]
5522A Setting
Degrees C Degrees F
K -182.0 °C -182.0 ±(0.9) -295.6 ±(1.6)
K -80.0 °C -80.0±(0.8) -112.0 ±(1.4)
K 530.0 °C 530.0 ±(1.2) 986.0 ±(2.3)
K 1355.0 °C 1355.0 ±(2.1) 2471.0 ±(3.8)
J -197.0 °C -197.0 ±(1.0) -322.6 ±(1.7)
J 258.0 °C 258.0 ±(1.1) 496.4 ±(1.9)
J 705.0 °C 705.0 ±(1.5) 1301.0 ±(2.7)
[1] When changing thermocouple types, be use to change the corresponding hiookup wire. For example, K-type thermocouple wire
changes to J-type thermocouple wire.
How to Calibrate the Thermometer
The following procedure refers to the Fluke 51 as the Unit Under Test (UUT). Use
copper hookup wire for all connections, except for steps 17 to 20.
Caution
To prevent damage to the Fluke 51 Thermometer, use only the
elastomeric switch pad supplied when directed to short the
switch grid on the circuit board.
1. Turn the UUT off and remove the top case, leaving the pca in the bottom case.
2. Ensure the calibrator is in standby and connect the UUT to the calibrator as shown in
Figure 4-22. When making this connection with the UUT case top removed, make
sure that the wide blade is oriented the same as the case top would normally allow.
3. Simultaneously short the TP1 grid and turn on the UUT by shorting the ON/OFF
switch grid. Hold the elastomeric switch pad on TP1 for at least 3 seconds after turn
on. This puts the UUT into the Thermocouple Calibration mode.
4. Select °C mode and T1 on the UUT.
Note
The next few steps require specific voltages to be present on the inputs of
the Thermometer. By using the 10
μ
V/
°
C type thermocouple selection of
the calibrator, you can specify the output voltage on the TC terminals.
5. Press 0, C, and E. Ensure the softkey labeled OUTPUT indicates “tc”.
If not, press the OUTPUT softkey until it does.
6. Press the TYPE softkey until 10μV/°C is displayed. This selection allows you to
specify the voltage on the TC terminal.
7. Press the TC MENU softkey.
8. Press REF SRC softkey until “external” is displayed.
9. Press the REF softkey to enter an external reference value.
10. Press 0 and E to set the external reference to 0 °C.
11. Press P to go back one menu level.
12. Press O.
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