HP ESA-L1500A, User'S And Calibration Manual

Page: 258 / 326

Chapter 9 257
Performance Verification Tests
14. Spurious Responses
5. Press
PRESET
on the synthesized sweeper. Set the sweeper’s
CW
frequency to F2 as indicated in Table 9-17 . Set the synthesized
sweeper controls as follows:
POWER LEVEL
,
+4 dBm
RF
,
Off
6. On the spectrum analyzer, press
PRESET
, then wait until the preset
routine is finished. Press
System
,
Alignments
,
Auto Align
,
Off
. Press
Frequency
and set the analyzer’s
Center Freq
to F1 as indicated in
Table 9-17 . Press the following keys on the spectrum analyzer:
Frequency, CF Step Auto Man
,
50 kHz
Span
,
20 kHz
Amplitude
,
Amptd Units, dBm, Done
Ref Level
,
−
15 dBm
Attenuation Auto Man 10 dB
BW/Avg, Video BW Auto Man, 300 Hz
Search
,
Peak Excursn
,
3 dB
7. On the synthesized signal generator, adjust the amplitude until the
measuring receiver reads
−
12 dBm
±
0.1 dB.
8. Disconnect the power sensor from the directional bridge. Connect
the directional bridge directly to the spectrum analyzer RF Input
using an adapter (do not use a cable).
75
Ω
Input only: Use a 50
Ω
to 75
Ω
mechanical adapter and a 75
Ω
Type N (m) to BNC (m) adapter.
CAUTION
Support the directional bridge and low pass filter to minimize stress on
the spectrum analyzer’s input connector.
9. In the following steps, the two input tones will be approximately 3
dB above the reference level and will appear “clipped”. The marker
readings are still accurate, however. On the spectrum analyzer, press
the following keys:
Peak Search
Search, Mkr
→
CF
Marker, Marker
∆
Frequency
↑
10.On the synthesized sweeper, set the
RF ON
.
11.Press
Peak Search
on the spectrum analyzer.