HP 8568B Performance Tests And Adjustments Manual page 298

12. Option 857 Amplitude Fidelity Test
Frequency 1
Synthesizer Calibrated MARKER A Amplitude (Column 2 - Column 1)
Amplitude Amplitude
Step
+ 10 0 (ref)
0 -10
-10 -20
-20 -30
-30 -40
-50
-40
-50 -60
-60 -70
-70 -80
-90
-80
5-4 Option 857
2 Fidelity Error
0 (ref)
12. Subtract the greatest negative fidelity error from the greatest
positive fidelity error for calibrated amplitude steps from -10 dB
to -70 dB. The results should be 250.8 dB.
13. Subtract the greatest negative fidelity error from the greatest
positive fidelity error for calibrated amplitude steps from -10 dB
to -90 dB. The results should be sf2.1 dB.
14. Set the frequency synthesizer for output amplitude to + 10 dBm.
15. Key in the following analyzer settings:
FREQUENCY
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SWEEP @?GF)
16. Press MARKER
[
PEAK SEARCH
the signal on the display.
17. Key in the following analyzer settings:
FREQUENCY
18. Press MARKER A. Step the frequency synthesizer output
amplitude from + 10 dBm to -80 dBm in 10 dB steps, noting
the MARKER A amplitude (a negative value) at each step and
recording it in column 2 of 'fable 5-2. Allow several sweeps after
each
step for the video filtered trace to reach its final ampltitude.
19. Subtract the value in column 1 from the value in column 2 for
each
setting to find the fidelity error.
Cumulative Cumulative
Error
0 to 80 dB
0 (ref)
], [j), [MKR-IREF LVL]
Error
0 to 90 dB
to center
Hz
Hz