2
Performance Tests
30
Keysight N1911A/1912A Service Guide
Zero Set (Average Path)
Description
Zero set is defined as the amount of residual offset error that is present following a
zero operation. This offset error is caused by contamination from several sources,
including circuit noise. This test measures the effectiveness of zero set by
performing 15 back-to-back zero operations of the average path (with no sensor
attached), after which the standard deviation of the results is calculated and
returned as the measured value.
Equipment
– No test equipment required
Test method
1
Execute the internal zero set measurement procedure for channel A.
2
Read back the result of the measurement from the DUT.
3
If the DUT model number is N1912A, then repeat this procedure for channel B.
4
The test will take a few minutes to complete.
5
The measurement result should be less than 0.0000175. The smaller the
measurement result, the smaller the amount of residual offset error.
NOTE
– This test can be performed manually via the commands:
SERV:BIST:PEAK[1|2]:ZSET
SERV:BIST:CW[1|2]:ZSET:NUM?
(Refer to the programming guide for further details on the use of these
commands)
– No adjustment is available for this test if it fails (see
Chapter 4,
"Troubleshooting Guide"
).
