THM500 Series Performance Verification
12
Handheld and Benchtop Instruments Basic Service
DMM Verification
The following checks verify the performance of the DMM functions. The
oscilloscope verification begins on page 15.
NOTE. The THM575 can display menus in more than one language. The
language selections are located in the Utility menu.
The following check verifies DC 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-DC. If
the range display at the lower-right does not indicate AUTO, press the
Y
and
B
buttons simultaneously to set the RANGE to AUTO.
2. Connect the voltage source output to the THM500 series instrument DMM
and COM inputs as shown in Figure 2. Assure that the ground connection for
each adapter connects to the common (or ground) connector of its associated
instrument.
3. Set the voltage source for DC output.
Voltage source
THM5xx
COM
DMM
+
50 cable
BNC to dual
banana adapter
BNC to dual banana cable
Figure 2: DC and AC Voltage Accuracy Test Setups
4. For each row of Table 7, 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.
DC Voltage Accuracy
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