HP ESA-L1500A, User'S And Calibration Manual

Page: 236 / 326

Chapter 9 235
Performance Verification Tests
10. Resolution Bandwidth Accuracy
Amptd Units, dBm, Done
4. Set the step attenuator to 3 dB.
5. Press
Search
,
Max PK
→
CF
on the analyzer.
6. Adjust the amplitude of the synthesized signal generator for a
marker amplitude reading of
−
5 dBm
±
0.2 dB.
7. Press
Peak Search
,
Marker
,
Marker
∆
on the analyzer.
8. Set the attenuator to 0 dB. Note the attenuator error for the 3 dB
setting.
Attenuator Error (3 dB) ____________ dB
9. On the analyzer, press
Marker
. Lower the marker frequency by
adjusting the knob until the marker delta amplitude is 0 dB plus the
attenuator error noted in
step 8
±
0.05 dB.
10.Record the marker frequency readout in column 3 of Table 9-13 .
11.Using the analyzer knob, raise the marker frequency so that the
marker delta amplitude is maximum. Continue increasing the
marker frequency until the marker reads 0.0 dB plus the attenuator
error noted in
step 8
±
0.05 dB.
12.Record the marker frequency readout in column 4 of Table 9-13 .
13.Set the attenuator to 3 dB.
14.Press
Marker
,
Marker Normal
on the analyzer.
15.Repeat step 5 through step 14 for each of the Res BW and Span
settings listed in Table 9-13 .
16.Subtract the lower marker frequency from the upper marker
frequency. Record the difference as the 3 dB bandwidth, in the
performance verification test record as indicated in
Table 9-13 .
17.Press
Preset, System
,
Alignments, Auto Align, All
.
3 dB Bandwidth Upper Marker Frequency Lower Marker Frequency – =