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5522A
Operators Manual
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.
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
2. Verify that the EARTH indicator is lit; if not, press Z.
3. Set up the calibrator by pressing0CE. Ensure the softkey labeled
4. Select the thermocouple type and reference source by pressing the TC MENUS
5. Enter the calibrator settings listed in Table 4-6 and verify performance is within
4-64
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.
51
K/J THERMOMETER
ON/OFF
F/C
HOLD
OFFSET
!
60V
24V
MAX
Connection wiring must match thermocouple type, e.g., K, J, etc.
Figure 4-22. Cable Connections for Testing a 50 Series Thermometer
OUTPUT indicates "tc". If not, press the OUTPUT softkey until it does.
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.
specifications (see Chapter 1).
Note
5522A
CALIBRATOR
gjh029.eps
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