390 Chapter 2
Performance Verification Tests
53. IF INPUT Accuracy (Option AYZ only)
53. IF INPUT Accuracy (Option AYZ only)
This test only applies to analyzers equipped with external mixing
(Option AYZ).
This test measures the accuracy of the IF INPUT. A nominal –30 dBm,
321.4 MHz signal is applied to a power sensor and the power level is
recorded. The actual frequency must be offset slightly to compensate for
the IF centering error of the 1 kHz resolution bandwidth. This
frequency offset is measured using the 321.4 MHz signal applied to the
50 Ω Input connector. The signal is measured with frequency
corrections on and off. The difference between these two measurements
is the IF centering error. The 321.4 MHz signal is then offset by the IF
centering error.
This signal is then applied to the IF INPUT of the analyzer which is set
to external mixing mode in A band (26.5 GHz to 40 GHz). Amplitude
corrections are set to 0 dB. The amplitude is measured by the analyzer
and then recorded. The difference between the two measurements is the
IF INPUT accuracy.
The related adjustment procedure for this performance test is
“IF INPUT Correction.”
Equipment Required
Synthesized sweeper
Power meter
Low-power power sensor
30 dB reference attenuator
Cable, APC 3.5
Cable, BNC
Adapter, type-N (m) to APC 3.5 (f) (not required for Option BAB)
Adapter, APC 3.5 (f) to APC 3.5 (f) (two required for Option BAB)
Adapter, type-N (f) to APC 3.5 (f)