THM420 Performance Verification
8
Handheld and Benchtop Instruments Basic Service
Test Equipment
The performance verification procedures use external traceable test equipment to
directly check warranted characteristics. The following procedures use either the
Wavetek 9100 Universal Calibration System with Oscilloscope Calibration
Module (Option 250) or the Fluke 5500A Multi-product Calibrator with
Oscilloscope Calibration Option 5500A-SC.
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.
Verification Procedure
WARNING. The following tests use hazardous voltages. If you use standard
banana plugs to apply test signals to the THM420 instrument, do not touch the
exposed conductors.
NOTE. For the following series of tests, set the METER/SCOPE button to the
METER mode.
To verify the performance of your THM420 instrument, perform the following
checks in sequential order.
The following check verifies DC voltage measurement accuracy.
1. Turn the THM420 rotary switch to V
.
2. Set the DC/AC button to DCV.
3. Connect the voltage source output to the THM420 COM and the V W Hz
inputs.
4. Configure the voltage source to output DC.
5. Set the controls of the THM420 and the voltage source to each of the values
listed in Table 9; then verify that the THM420 readout remains within the
readout limits.
DC Voltage
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