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16. Residual FM
Test
Specification
<3
Hz peak-to-peak in
110
s; frequency span ~100 kHz, resolution
bandwidth
530
Hz, video bandwidth
530
Hz.
Description
The spectrum analyzer CAL OUTPUT is used to supply a stable 20
MHz signal to the analyzer. The analyzer is tuned in zero span to a
point on the 30 Hz bandwidth response for which the slope of the
response is known from direct measurement. The residual FM is then
slope detected over a 10 second interval, yielding a trace whose
peak-to-peak excursion is proportional to the residual FM.
Equipment
None Required
Procedure
1. Press
(~N~TR
PRESET).
2. Connect CAL OUTPUT to SIGNAL INPUT 2.
3. Press (RECALL) 8 and adjust AMPTD CAL for a MARKER amplitude
of -10.00 dBm
ho.02
dB.
4. Press
CRECALL)
9 and adjust FREQ ZERO for a maximum amplitude
trace.
5. Set
PREFERENCE
LEVEL) to -10 dBm. Adjust FREQ ZERO
counterclockwise until trace is at the center graticule line.
6. Set
~FREQUENCY
SPAN) to 100 Hz. Press SWEEP
CSINGLE)
and wait
for completion of the sweep.
7. Press MARKER
Cm),
and place marker 1 division above the
center graticule line on the negative-going side of the trace. Press
MARKER In] and set the movable marker 1 division below the
center graticule line. See Figure 2-28.
2-56 Performance Tests