2 Performance Tests
56 Keysight N1913/1914A 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 N1914A, 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.
This test can be performed manually via the commands:
SERV:BIST:CW[1|2]:ZSET
SERV:BIST:CW[1|2]:ZSET:NUM?
(Refer to the N1913/1914A EPM Series Power Meters Programming Guide for
further details on the use of these commands)
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