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Performance Tests
5. 3 dB Bandwidth
14.Set the center frequency of the spectrum analyzer 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
15.On the spectrum analyzer, press the following keys:
MARKER
NORMAL
PEAK SEARCH
PRESEL PEAK
16.When the preselector-peak routine is complete, press MARKER
17.On the spectrum analyzer, press
number.
18.On the spectrum analyzer, use the
time until the delta-marker amplitude is less than or equal to − 3.0 dB.
19.Record the Center Frequency and the preselector Low DAC number in
page 146.
20.On the spectrum analyzer, use the
increasing the DAC number until the delta marker amplitude goes back to 0. Continue
to increase the DAC number until the delta-marker amplitude is less than or equal to
− 3.0 dB.
21.Record the preselector DAC number in
Number.
132
and
to activate the preselector DAC
SHIFT
GHz
⇓
key to reduce the DAC number by one step at a
⇑
key to tune to the other side of the filter by
Table 4-11
on page 146 under High DAC
and
CENTER FREQUENCY
∆
and
PEAK SEARCH
Table 4-11
on
Chapter 4
.
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