Front Panel Operation
Sample Applications
4
4-73
Table 4-6. Thermocouple Performance
Thermocouple 5520A Display Readings
Type [1] 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 hookup wire, e.g.,
K-type thermocouple wire changes to J-type thermocouple wire.
4-68. Calibrating 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
When you are directed to short a switch grid on the 51, use
only the elastomeric switch pad that is supplied, because you
could damage the printed circuit assembly (pca) if a hard tool
is used.
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, Cand 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.
To Next Page
Loading...
