5520A
Operators Manual
4-72
4-67. Testing 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.
HI
LO
TRIG
GUARD
TC
20A
NORMAL AUX
SCOPE
OUT
V, , ,
RTD
A, -SENSE,
AUX V
20V PK MAX
20V PK MAX
5520A
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.
nn049f.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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