15. Residual Responses
Figure 2-27. Residual Responses Measurement
8. Look for any residual responses at or above the display line. If a
residual is suspected, press SWEEP
again and see if the
response persists. A residual will persist on repeated sweeps, but
a noise peak will not. Any residual responses must be below the
display line.
Largest Residual Level
H
Z
at
9. If a response appears to be marginal, perform the following check
to
a.
b.
determine whether or not it exceeds the specification:
Press
Press MARKER
and place the marker on the peak of
the response in question.
C.
d.
Press MARKER
(
SIGNAL
then activate SWEEP
Reduce
(
FREQUENCY SPAN
)
to 1 MHz. Reduce
until
there is at least a
margin between the display line and the
average noise level. The amplitude of the response must be
less than the display line setting.
e. Press
to resume the search for residuals.
10. Key in control settings as follows:
START FREQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-62 Performance Tests
