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Performance Tests
2. Image Rejection Test
14.Set the spectrum analyzer reference level by pressing
the corresponding value for the band listed below:
for an 11974A: − 40 dBm
for an 11974Q: − 40 dBm
for an 11974U: − 40 dBm
for an 11974V: − 55 dBm
15.Set the spectrum analyzer center frequency by pressing
entering the corresponding value for the band listed below:
for an 11974A: 26.5 GHz
for an 11974Q: 33 GHz
for an 11974U: 40 GHz
for an 11974V: 50 GHz
16.On the spectrum analyzer, press the following keys:
MARKER
NORMAL
PEAK SEARCH
PRESEL PEAK
17.When the preselector-peak routine is complete, press
18.Record the marker frequency in
19.On the spectrum analyzer, press MARKER
20.On the spectrum analyzer, press
image response. Press
response. The absolute value of the delta marker amplitude is the Image Rejection.
NOTE
If the signal is buried in the noise floor, reduce the video bandwidth to 100 Hz
to help identify the signal. At some frequencies, however, instrument
performance is so good that an image response may not be visible.
21.Record the Image Rejection in
22.On the synthesized sweeper, press
synthesized sweeper 500 MHz higher.
23.On the spectrum analyzer, set the
of the signal source.
116
Table 4-8
on page 143.
∆
CENTER FREQUENCY
to place the delta marker at the top of the image
PEAK SEARCH
Table 4-8
on page 143.
⇑
and
CW
CENTER FREQUENCY
REFERENCE LEVEL
CENTER FREQUENCY
PEAK SEARCH
.
and use the
to increase the frequency of the
to match the output frequency
and entering
and
.
⇑
key to tune to the
Chapter 4
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