5522A
Operators Manual
4-64
How to Calibrate a Fluke 51 Thermometer
The Fluke 51 Thermometer measures temperature using a type J or K thermocouple. The
calibrator simulates both thermocouples, simplifying testing and calibration. The
following demonstrates how the calibrator is used to calibrate this thermometer.
Note
These procedures are included here as an example. The Model 51 Service
Manual contains the authoritative testing and calibration procedures.
How to Test the Thermometer
The following test should be conducted only after the thermometer has had time to
stabilize to an ambient temperature of 23 °C ±5 °C (73 °F ±9 °F).
1. Connect the Fluke 51 Thermometer to the calibrator using the appropriate connection
cable (Figure 4-22). The connection cable and miniconnector material must match
the thermocouple type. For example, if testing a K thermocouple, the cable and
miniconnector are for a type K thermocouple.
5522A
CALIBRATOR
!
60V
24V
MAX
OFFSET
ON/OFF
F/C
HOLD
K/J THERMOMETER
51
Connection wiring must match thermocouple type, e.g., K, J, etc.
gjh029.eps
Figure 4-22. Cable Connections for Testing a 50 Series Thermometer
2. Verify that the EARTH indicator is lit; if not, press Z.
3. Set up the calibrator by pressing0CE. Ensure the softkey labeled
OUTPUT indicates “tc”. If not, press the OUTPUT softkey until it does.
4. Select the thermocouple type and reference source by pressing the TC MENUS
softkey. Ensure the REF SRC softkey selection indicates “intrnl.” If not, press the
REF SRC softkey. Ensure the TYPE softkey indicates either J or K, depending on
which one the 51 is set to. Continue to press the TYPE softkey until the selected
thermocouple type is displayed.
5. Enter the calibrator settings listed in Table 4-6 and verify performance is within
specifications (see Chapter 1).
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