THM500 Series Performance Verification
Handheld and Benchtop Instruments Basic Service
13
Table 7: DC Voltage Accuracy Test Limits
Instrument Range DC Voltage Source Instrument Readout
400 mV 300 mV 298.0 to 302.0
4V 3V 2.980 to 3.020
40 V 30 V 29.80 to 30.20
400 V 300 V 298.0 to 302.0
850 V 500 V 492 to 508
The following check verifies AC voltage accuracy.
WARNING. This test uses hazardous voltages. If you use standard banana plugs
to apply test signals to the THM500 series instrument, do not touch the exposed
conductors.
1. Set the THM500 series instrument to METER mode displaying V-AC. If
the range display at the lower-right corner does not indicate AUTO, press the
Y
and
B
buttons simultaneously to set the RANGE to AUTO.
2. Set the voltage source to 60 Hz AC output.
3. For each row of Table 8, use the
Y
and
B
buttons to set the THM500 series
instrument to the range specified in the first column; then set the voltage
source to the output voltage specified in the second column. Verify that the
THM500 series instrument readout is within the range listed in the third
column.
Table 8: AC Voltage Accuracy Test Limits
Instrument Range Voltage Source at 60 Hz Instrument Readout
400 mV 300 mV 293.5 to 306.5
4V 3V 2.935 to 3.065
40 V 30 V 29.35 to 30.65
400 V 300 V 293.5 to 306.5
600 V 500 V 485 to 515
4. Set the calibrator output to a safe voltage (less than 20 V) and disconnect the
THM500 series instrument from the calibrator.
5. Disconnect the test setup.
AC Voltage Accuracy
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