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14. Residual Responses Test
9.
10.
11.
Figure 2-24. Residual Responses Measurement
Press SWEEP
[SINGLE_)
and wait for completion of sweep. Look for
any residual responses at or above the display line. If a residual
is suspected, press SWEEP
CRINGLE)
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
c-105
dBm.
Option 400:
Any residual 500 Hz to 2.5 kHz must be
c-95
dBm;
any residuals
>2.5
kHz must be
c-105
dBm
If a response appears marginal, do the following to determine
whether or not it exceeds the specification.
a. Press
ISAVE_)
0.
b. Press MARKER
[NORMAL)
and place the marker on the peak of
the response in question.
c. Press MARKER
Ijj),
then activate SWEEP
m.
d. Reduce [FREQUENCY SPAN] to 1 MHz or less. The amplitude of
the response should be
c-105
dBm (below the display line).
e. Press (RECALL] (iJ 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
dBm
MHz
2-46 Performance Tests