5502A
Operators Manual
4-66
2.
Make sure that the EARTH indicator is on. If not, push
.
3.
Push
to set up the Calibrator. Make sure the softkey named
OUTPUT shows “tc”. If not, push the OUTPUT softkey until it does.
4.
Select the thermocouple type and reference source with the TC MENUS softkey.
Make sure the REF SRC softkey selection shows “intrnl.” If not, push the REF SRC
softkey. Make sure the TYPE softkey shows J or K. This will be the one that the 51 is
set to. Continue to push the TYPE softkey until the selected thermocouple type is
shown.
5.
Record the Calibrator values shown in Table 4-7 and verify performance is not more
or less than its specifications (see Chapter 1).
Table 4-7. Thermocouple Performance
Thermocouple Type
[1]
5502A
Setting
Display Readings
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 you change thermocouple types, be sure to also change the hookup wire that goes with the thermocouple. For
example, K-type thermocouple wire changes to J-type thermocouple wire.
Calibrate the Thermometer
The subsequent procedure uses “UUT” (Unit Under Test) in place of “Fluke 51”. Use
copper hookup wire for all connections other than steps 17 to 20.
Caution
To prevent damage to the Fluke 51 Thermometer, use only the
elastomeric switch pad supplied when you short the switch grid
on the circuit board.
1.
Turn off the UUT and remove the top case. Keep the PCA in the bottom case.
2.
Make sure the Calibrator is in standby and connect the UUT to the Calibrator as
shown in Figure 4-19. When you make this connection with the UUT case top
removed, make sure that the wide blade is on the same side as the wide case top hole.
3.
At the same time, short the TP1 grid and short the ON/OFF switch grid to turn on the
UUT. Hold the elastomeric switch pad on TP1 for a minimum of 3 seconds after turn
on. This puts the UUT into the Thermocouple Calibration mode.
4.
Select
°
C mode and T1 on the UUT.
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