THM420 Performance Verification
10
Handheld and Benchtop Instruments Basic Service
The following check verifies resistance measurement accuracy.
1. Turn the THM420 rotary switch to .
2. Connect the resistance source output to the THM420 COM and the
V W Hz
input connectors.
3. Set the controls of the THM420 and the resistance source to each of the
values listed in Table 11; then verify that the THM420 readout remains
within the readout limits.
Table 11: Ohms Accuracy
Readout Limits
THM420 Range Resistance Source Minimum Maximum
400 W 100.0 W 99.2 W 100.8 W
400 kW 100.0 kW 99.4 kW 100.6 kW
40 MW 10.00 MW 9.80 MW 10.20 MW
4. Disconnect the test setup.
The following check verifies diode and continuity measurement accuracy.
1. Turn the THM420 rotary switch to
and .
2. Connect the THM420 COM input to the V W Hz
input with a shorting
strap.
3. Verify that the THM420 readout indicates approximately 0.000V and the
beeper sounds.
4. Disconnect the test setup.
The following check verifies frequency measurement accuracy.
1. Turn the THM420 rotary switch to Hz.
2. Connect the frequency source output to the THM420 COM and the
V W Hz
input connectors.
3. Set the controls of the THM420 and the frequency source to each of the
values listed in Table 12; then verify that the THM420 readout remains
within the readout limits.
Resistance
Diode and Continuity
Frequency
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