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16. Residual FM Test
13. Press MARKER
Ia]
and position movable marker at the lowest
point on the trace (see Figure 2-30). Read the MARKER A
amplitude from the display and record its absolute value.
MARKER A amplitude = p-p amplitude =
dB
14. Divide the peak-to-peak amplitude by the slope computed in step
8 to obtain the residual FM:
p-p amplitude/filter slope = residual FM
dB/
dB/Hz
=
Hz
= residual FM
The residual FM should be less than 3 Hz.
15. Press ~NSTR PRESET].
16. Press
Cm]
9 and adjust FREQ ZERO for a maximum amplitude
trace.
Performance Tests 2-59