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Chapter 3: Service
Calibration Testing Procedures
6 Read and record the offset voltage on the DVM. _____________mV
If the offset voltage is greater than 1.0 mV, continue with the test but see the
second sidebar at the end of this test.
7 Connect the probe to the 5.0 V supply.
8 Read and record the voltage reading on the DVM. _____________mV
9 Subtract the reading in step 6 from the reading in step 8.
_____________mV
The result should be 500 mV 2.5 mV.
10 Calculate the dc gain.
result in step 9
-------------------------------------------------------- -
5.00 V (supply voltage)
The dc gain should be between 0.09950 and 0.10050 (0.10 0.5%).
11 Record the results of step 10 in the Calibration Test Record on page
50..
If the test fails
Go to the troubleshooting section in this chapter.
.
If the offset voltage is greater than 1.0 mV
If the offset voltage is close to the specification, it should not affect this test. Use
the "Troubleshooting and Repair" section to determine why the offset voltage is
not at zero.
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