Performance Verification; Zero Set Verification; Figure 1-1 Zero Set Verification Setup - Keysight 8990B Service Manual

Performance Verification

Zero set verification

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 is a system-level verification which requires the
N1923/4A wideband power sensor.
Required test equipment:
– 1 unit of N1923/4A wideband power sensor
System specification:
– <200 nW (frequency >500 MHz)
– <550 nW (frequency <500 MHz)
Test procedure
1 Turn on the 8990B.
2 Connect the N1923/4A to the 8990B as shown in
Figure 1-1
3 Allow the system to warm up for approximately an hour.
4 Set the 8990B RF input channel 1 frequency to 1 GHz.
5 Connect the N1923/4A to the sensor check source of the 8990B.
Keysight 8990B Service Guide
N1923/4A
Zero set verification setup
Performance Verification and Adjustments
8990B
Figure 1-1.
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