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12. Option 857 Amplitude
Fidelity Test
‘Ikble
5-1. Log Amplitude Fidelity (10 Hz
RBW;
Option 857)
Frequency 1
2
Fidelity Error
Cumulative
Cumulative
Synthesizer Calibrated MARKER A Amplitude (Column 2
-
Column 1)
Error
Error
Amplitude Amplitude
WI
GW
0 to 80
dB
0 to 90
dB
Pm)
Step
WI
WY
+ 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
<*l.O
dB
sf1.5
dB
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.
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.
dB
14. Set the frequency synthesizer for output amplitude to + 10 dBm.
15. Key in the following analyzer settings:
FREQUENCY SPAN] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
100
kHz
;&TTiFV,
_.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 kHz
SWEEP
@?GF)
16. Press MARKER [PEAK SEARCH],
[j),
[MKR-IREF
LVL]
to center
the signal on the display.
17. Key in the following analyzer settings:
FREQUENCY SPAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.o
Hz
k-1
t,.....,....................................... 1
Hz
1Hz
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.
5-4 Option 857