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148 Chapter 4
ESA Functional Tests
Reference Level Accuracy
ESA Functional Tests
4. Press Peak Search on the analyzer. Adjust the amplitude on the synthesized sweeper
until the marker amplitude on the analyzer reads –30 dBm +/– 0.10 dB. Enter the
synthesized sweeper power level as the Synthesized Sweeper Amplitude reference in
Table 4-4 on page 148.
NOTE Under these analyzer conditions, the sweep time is 1.7 seconds. Therefore,
the marker amplitude updates are fairly slow when adjusting the synthesizer
output power.
5. Now that the reference has been established in step 4, adjust the synthesized sweeper
power level and the analyzer reference level according to Table 4-4 on page 148. (The
synthesized sweeper output power and the analyzer’s reference level will be changed in
10 dB steps.)
6. On the analyzer, press
Single, wait for a sweep to finish, and then press Peak Search,
Marker, Delta.
7. For each new synthesized sweeper power level and analyzer reference level change,
press the following keys on the analyzer:
Single
Peak Search
Record the Analyzer Marker Amplitude reading in Table 4-4.
Table 4-4 Reference Level Accuracy Worksheet (Log Mode)
Analyzer
Reference Level
Synthesized
Sweeper Amplitude
(dBm)
Minimum
(dB)
Analyzer
Marker
∆
Amplitude
(dB)
Maximum
(dB)
dBm dBmV
–30 21.76 Reference = _____ 0 (Reference) 0 (Reference) 0 (Reference)
–20 31.76 Reference + (10 dB) 8.60 11.40
–10 41.76 Reference + (20 dB) 18.60 21.40
–40 11.76 Reference + (–10 dB) –11.40 –8.60
–50 1.76 Reference + (–20 dB) –21.40 –18.60
–60 – 8.24 Reference + (–30 dB) –31.40 –28.60
–70 –18.24 Reference + (–40 dB) –42.0 –38.0