Agilent Technologies 11974 Series, User Manual

Page: 129 / 156

128 Chapter 4
Performance Tests
4. Displayed Average Noise Level
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14.Record the following in Table 4-10 on page 146.
Center Frequency
Displayed Average Noise Level (Marker Amplitude)
15.On the spectrum analyzer, press
SHIFT
and
SWEEP TIME
to turn off the video average
function.
16.On the spectrum analyzer, press
CENTER FREQUENCY
and enter the corresponding
value for the band listed below:
for an 11974A: 40 GHz
for an 11974Q: 50 GHz
for an 11974U: 60 GHz
for an 11974V: 75 GHz
17.Set the conversion loss to the value recorded for this frequency in Table 4-7 on page 140.
Press
SHIFT
, 5, and
MHz
, then enter the conversion loss value from Table 4-7 on
page 140. Press
dB
to terminate the entry. Record this value in Table 4-10 on page 146.
18.On the spectrum analyzer, press
SHIFT
,
VIDEO BW
, 10, and
Hz
to activate the video
average function to average 10 traces.
19.After the video average counter reaches 10, press MARKER
NORMAL
and
PEAK SEARCH
. The marker amplitude is the displayed average noise level.
20.Record the following in Table 4-10 on page 146.
Center Frequency
Displayed Average Noise Level (Marker Amplitude)
21.On the spectrum analyzer, press
SHIFT SWEEP TIME
to turn off the video average
function.
22.On the spectrum analyzer, press
CENTER FREQUENCY
and enter the frequency
corresponding to the maximum conversion loss measured in Table 4-7 on page 140.
23.Set the conversion loss to the value recorded for this frequency in Table 4-7 on page 140.
Press
SHIFT 5 MHz
, then enter the conversion loss value from Table 4-7 on page 140.
Press
dB
to terminate the entry. Record this value in Table 4-10 on page 146.
24.On the spectrum analyzer, press
SHIFT
,
VIDEO BW
, 10, and
Hz
to activate the video
average function to average 10 traces.
25.After the video average counter reaches 10, press MARKER
NORMAL
and
PEAK SEARCH
. The marker amplitude is the displayed average noise level.
26.Record the following in Table 4-10 on page 146.
Center Frequency
Displayed Average Noise Level (Marker Amplitude)