HP 8568B, Performance Tests And Adjustments Manual, Page: 298 / 313

12. Option 857 Amplitude Fidelity Test
5-1. Log Amplitude Fidelity (10 Hz Option 857)
Frequency 1 2 Fidelity Error Cumulative Cumulative
Synthesizer Calibrated MARKER A Amplitude (Column 2 Column 1) Error Error
Amplitude Amplitude
0 to 80 0 to 90
Step
+ 10 0 (ref) 0 (ref) 0 (ref)
0 -10
-10 -20
-20 -30
-30 -40
-40
-50
-50 -60
-60 -70
-70 -80
-80
-90
12. Subtract the greatest negative fidelity error from the greatest
positive fidelity error for calibrated amplitude steps from -10
to -70
The results should be
13. Subtract the greatest negative fidelity error from the greatest
positive fidelity error for calibrated amplitude steps from -10
to -90
The results should be
14. Set the frequency synthesizer for output amplitude to + 10
15. Key in the following analyzer settings:
FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SWEEP
16. Press MARKER
[
PEAK SEARCH
],
to center
the signal on the display.
17. Key in the following analyzer settings:
FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hz
...,....................................... 1
Hz
18. Press MARKER A. Step the frequency synthesizer output
amplitude from + 10 -80 in 10 steps, noting
the MARKER A amplitude (a negative value) at each step and
recording it in column 2 of
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.
5-4 Option 857