HP 8559A Operation And Service Manual page 46

PERFORMANCE TESTS
RESIDUAL FM
4-13.
SPECIFICATION:
Less than 2 kHz peak-to-peak for a time interval 10.1 second; less than 2 kHz peak-to-peak in a 180-series
display mainframe with 220/240 line voltage.
DESCRIPTION:
This test measures the inherent short-term instability (residual FM) of the LO system in the spectrum analyzer.
A stable signal (supplied by a comb generator) is applied to the spectrum analyzer input and slope-detected with
the linear portion of the 10-kHz bandwidth filter in zero span (fixed-tuned receiver
of the spectrum analyzer's LO frequency (residual FM) can be measured as an amplitude shift on the CRT
display (1 kHz 0.7 major division with LIN Amplitude Scale).
EQUIPMENT:
Comb Generator
Adapter, Type N (m) to BNC (f) (2 required)
PROCEDURE:
1. Set equipment controls as follows:
Spectrum Analyzer:
TUNING
FREQUENCY SPAN/DIV
RESOLUTIONBW
INPUT ATTEN
REFERENCELEVEL
REFLEVELFINE
SWEEPTRIGGER
.....................................................................
ALTIF
.................................................................
SIGIDENT
BLCLIP
VIDEOFILTER
PERFORMANCE TESTS
SPECTRUM
ANALYZER
ADAPTER
FIGURE RESIDUAL FM TEST SETUP
see Figure 4-6). Variations
-
COMB
GENERATOR
ADAPTER
MODEL 8559A
HP 8406A
HP 1250-0780
100 kHz
30 dB
LIN
AUTO
OFF
OFF
OFF
OFF