HP ESA-L1500A, User'S And Calibration Manual

Page: 226 / 326

Chapter 9 225
Performance Verification Tests
8. Scale Fidelity
Measure Linear Fidelity
1. Set the 1 dB and 10 dB step attenuators as indicated in Table 9-10
for the
−
4 dB from REF LVL setting.
2. Press
Peak Search
on the analyzer and record the Mkr amplitude
reading in column 8 of Table 9-10 .
3. Calculate the Linear Fidelity Error (LFE) as a percentage of
reference level (RL), and record the result in the performance
verification test record as indicated in column 9 of
Table 9-10 .
LFE(% of RL) = 100 x (Actual Mkr Reading
−
Ideal Mkr Reading)
/223.6 mV
For example, if the Ideal Mkr Reading is 89.3 mV and the Actual
Mkr Reading is 85 mV, the Linear Fidelity Error would be:
LFE
= 100 x (85
−
89.3) / 223.6
= 100 x (
−
4.3) / 223.6
= 100 x 0.0192
= 1.92% of RL
4. Repeat step 1 through step 3 above for the remaining dB from Ref
Level settings indicated in Table 9-10 .
5. Press
Preset
,
System, Alignments, Auto Align, All
on the analyzer.
6. 75
Ω
Input only: Press
Amplitude, More, Input Z Corr 75