THM500 Series Performance Verification
14
Handheld and Benchtop Instruments Basic Service
The following check verifies resistance accuracy.
1. Set the THM500 series instrument to METER mode displaying . Connect
the THM500 series instrument to the resistance source as shown in Figure 3.
Resistance
source
THM5xx
COM
DMM
+
50 cable
BNC to dual banana cable
BNC to dual
banana cable
Figure 3: Resistance Accuracy Test Setup
2. For each row of Table 9, use the
Y
and
B
buttons to set the THM500 series
instrument to the range specified in the first column; then set the resistance
source to the resistance specified in the second column. Verify that the
THM500 series instrument readout is within the range listed in the third
column.
Table 9: Resistance Accuracy Test Limits
Instrument Range Resistance Source Instrument Readout
400 100 99.3 to 100.7
4k 1k 0.993 to 1.007
40 k 10 k 9.93 to 10.07
400 k 100 k 99.3 to 100.7
4M 1M 0.993 to 1.007
3. Disconnect the test setup.
4. If you will not be performing the Oscilloscope Verification procedures, use
the menus to return the THM500 series instrument to factory default settings
by selecting RESET ALL.
Resistance Accuracy
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