THM420 Performance Verification
Handheld and Benchtop Instruments Basic Service
11
Table 12: Frequency Accuracy
Frequency Source Readout Limits
THM420 Range Voltage Frequency Minimum Maximum
100 kHz 1.000 V 50 kHz 49.91 kHz 50.09 kHz
4. Disconnect the test setup.
The following check verifies DC ampere measurement accuracy.
1. Turn the THM420 rotary switch to mA
for the first verification; turn the
THM420 rotary switch to A
for the second verification.
2. Set the THM420 DC/AC button to DCA.
3. Set the current source to output DC.
4. Connect the current source output to the THM420 COM and the V W Hz
input connectors.
5. Set the controls of the THM420 and the current source to each of the values
listed in Table 13; then verify that the THM420 readout remains within the
readout limits.
Table 13: DC Amperes Accuracy
Readout Limits
M
20 Rot
ry
Switch
DC Current Source
Minimum Maximum
mA 200.0 mA 198.5 mA 201.5 mA
A 2.000 A 1.94 A 2.06 A
6. Do not disconnect the test setup.
The following check verifies AC ampere measurement accuracy.
1. Turn the THM420 rotary switch to mA
2. Set the THM420 DC/AC button to ACA.
3. Reconfigure the current source to output AC.
4. Set the controls of the THM420 and the current source to each of the values
listed in Table 14; then verify that the THM420 readout remains within the
readout limits.
DC Amperes
AC Amperes
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