DTM900 and DTM920 Performance Verification
Handheld and Benchtop Instruments Basic Service
5
Performance Verification
This section contains procedures to verify that the DTM900 and DTM920
thermometers perform as warranted. If an instrument fails any of the checks, it
needs adjustment and or repair. Verify the performance of your thermometer
annually or whenever its accuracy or function is in question.
The performance verification procedures provide a valid confirmation of
instrument electrical characteristics and function under the following conditions:
H The instrument operates in an 18_ to 28_ C ambient environment with a
relative humidity of less than 80%.
H The instrument warms up for 60 minutes.
H The instrument remains fully assembled (do not remove the bottom cover).
Test Equipment
The performance verification procedures use external traceable test equipment to
directly check warranted characteristics. If you substitute equipment, always
choose instruments that meet or exceed the minimum requirements specified in
Table 4.
Alternative test equipment must meet or exceed the intended minimum
requirements. If you substitute equipment, you may need to modify the
performance verification procedures.
NOTE. Before beginning the performance verification procedures, warm up the
test equipment according to the manufacturer’s recommendations.
Table 4: Performance Verification Test Equipment
Description Minimum requirements Example Product
Thermocouple Simulator –200_ to1370_ C ±0.01%
(–328_ to 2498_ F ±0.01%)
Wavetek 9100 Universal
Calibration System or
Fluke 5500A Calibrator
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