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50S & 50D Thermometer
Calibration Information
6
Required Test Equipment
Table 2 lists the required test equipment needed to perform the performance test and calibration procedures
for the 50S and 50D thermometers. If the required equipment is not available, instruments with equivalent
specifications may be used.
Table 2. Required Test Equipment
Test Equipment Required Characteristics Recommended Model
DMM DC Voltage Accuracy: 0.5%
Fluke 87 Series IV Digital
Multimeter
Temperature Probe Accuracy: Certified to ± 0.2
o
C ambient Fluke Model 80T-150U
DC Voltage Calibrator
Output Voltage 0 to 10 V
Accuracy: 0.025%
Resolution: 10 µV Fluke 5520A
Elastomeric Switch Pad Fluke Part Number 680686
Thermocouple Connector For K-type thermocouple
Fluke 80CK-M
Fluke Part Number 779942
Thermocouple Connector For J-type thermocouple
80CJ-M
Fluke Part Number 833046
Thermocouple Wire
(K or J Type) Standard Omega
Dewar Flask/Cap 1-pint capacity Thermos
Mercury Thermometer
(either
o
C or
o
F)
0.02
o
C resolution
0.05
o
F resolution
Princo Model ASTM56C
Princo Model ASTM56F
Performance Tests
Performance tests are recommended for incoming inspection, periodic maintenance, and for verifying the
thermometer’s specifications. If the thermometer fails any part of the performance tests, calibration and/or
repair is indicated.
Use the following procedure to prepare the thermometer before beginning the performance tests or
calibration procedures.
1. Allow the thermometer to stabilize to room temperature, 23
o
C ± 5
o
C (73
o
F ± 9
o
F).
2. Check the battery and replace it if necessary.
Display Test
Turn the thermometer on while pressing the HOLD button. All display segments are shown until the HOLD
button is released. Check that all the display segments are showing as in Figure 3.
Note
Because pressing the HOLD button during power-up activates one of the thermometers other
functions, take care to return the instrument to its normal function (if necessary).