HP ESA-L1500A, Руководство пользователя и калибровки

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Chapter 9 231
Performance Verification Tests
9. Input Attenuation Switching Uncertainty
Table 9-12
Input Attenuation Switching Uncertainty Worksheet
Measure Switching Uncertainty
1. Set the 1 dB and 10 dB step attenuators for the total nominal
attenuation as indicated in Table 9-12 for the 0 dB spectrum
analyzer attenuation setting. Table 9-11 may be used as a reference
for setting the step attenuators to achieve the desired total nominal
attenuation.
2. Set the spectrum analyzer reference level as indicated in
Table 9-12 for the 0 dB spectrum analyzer attenuation setting.
For analyzers with 50
Ω
inputs, use the column labeled “(dBm)”.
For analyzers with 75
Ω
inputs, use the column labeled “(dBmV)”.
3. Set the spectrum analyzer attenuation to 0 dB.
4. Press
Single Sweep
and wait for completion of a new sweep.
5. Press
Peak Search
. Record the marker amplitude in Table 9-12 as the
Mkr
∆
Reading.
Spectrum Analyzer Total
Nominal
Attenuation
Attenuation
Error
Mkr
∆
Reading
TR Entry
(Switching
Error) Attenuation Reference Level
dB dBm dBmV dB dB dB dB
10
−
50
−
1.2 50 0 0 Ref
0
−
60
−
11.2 60 1
5
−
55
−
6.2 55 2
15
−45
+3.8 45 3
20
−
40 +8.8 40 4
25
−35
+13.8 35 5
30
−
30 +18.8 30 6
35
−25
+28.8 25 7
40
−
20 +23.8 20 8
45
−15
+33.8 15 9
50
−
10 +38.8 10 10
55
−
5 +43.8 5 11
60 0 +48.8 0 12