HP ESA-L1500A, User'S And Calibration Manual

Page: 223 / 326

222 Chapter 9
Performance Verification Tests
8. Scale Fidelity
4. Set the step attenuators to 0 dB attenuation. Refer to Table 9-2
earlier in this chapter for information on manually controlling a
programmable step attenuator with an HP 11713A attenuator /
switch driver.
5. Press
Peak Search
on the analyzer.
6. Adjust the synthesized signal generator’s amplitude until the
analyzer’s marker amplitude reads 0 dBm
±
0.1 dB.
75
Ω
Input only: Adjust the synthesized signal generator’s amplitude
until the analyzer’s marker reads 48.8 dBmV
±
0.1 dB.
7. On the analyzer, press
Marker
,
Marker
∆
.
8. Do not adjust the synthesized signal generator’s amplitude after the
reference is established.
Measure Cumulative Log Fidelity
1. Set the 1 dB and 10 dB step attenuators as indicated in Table 9-9 for
the
−
4 dB from REF LVL setting.
2. Press
Peak Search
on the analyzer and record the Mkr
∆
reading in
column 7 of Table 9-9 .
3. Calculate the Cumulative Log Fidelity Error (CLFE) as follows and
record the result in the performance verification test record as
indicated in column 8 of
Table 9-9 :
4. Repeat step 1 through step 3 for the remaining ”dB from REF LVL”
settings indicated in Table 9-9 . For each setting of
−
64 dB and lower,
press the following analyzer keys after step 1 :
BW/Avg
,
Video Average On Off
(On)
5
,
Enter
Calculate Incremental Log Fidelity
1. Calculate the Incremental Log Fidelity Error (ILFE) for ”dB from
REF LVL” settings of
−
4 dB to
−
68 dB using the current and previous
Cumulative Log Fidelity Errors (CLFEs):
For example, if the CLFE for the
−
16 dB from REF LVL setting is
−
0.07 dB and the CLFE for the
−
20 dB from REF LVL setting is
+0.02 dB, the ILFE for the
−
20 dB from REF LVL settings is:
CLFE Total Actual Atten 4 dB from RL –
( )
=
+Delta MKR Reading Total Actual Atten (0 dB from RL) –
ILFE CLFE (current) CLFE (previous) – =
ILFE 20 dB –
( )
0.02 dB (0.07 dB) – 0.09 dB = =