HP 8568B, Performance Tests And Adjustments Manual, Page: 70 / 313

14. Residual Responses Test
9.
10.
11.
Figure 2-24. Residual Responses Measurement
Press SWEEP and wait for completion of sweep. 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
Option 400:
Any residual 500 Hz to 2.5 must be any residuals
must be
If a response appears marginal, do the following to determine
whether or not it exceeds the specification.
a. Press
b. Press MARKER and place the marker on the peak of
the response in question.
c. Press MARKER then activate SWEEP
d. Reduce
[
FREQUENCY SPAN
]
to 1 MHz or less. The amplitude of
the response should be (below the display line).
e. Press (RECALL] to resume the search for residuals.
Step
[
CENTER FREQUENCY
)
to 1510 MHz with checking for
residual responses at each step by the procedure of steps 9 and
10. There should be no residual responses at or above the display
line below 1500 MHz.
Maximum Residual Response
MHz
2-46 Performance Tests