
8. Option 857 Amplitude Fidelity Performance Test
Equipment
Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3335A
Adapter, Type N (m) to BNC (f) . . . . . . . . . . . . . . . . 1250-0780
BNC Tee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-0781
Procedure
Log Fidelity
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
On the spectrum analyzer, connect the CAL OUTPUT to the
RF INPUT. Press
(jj]
9 and adjust the FREQ ZERO pot for
maximum amplitude.
Press
(:!I
on the analyzer. Key in analyzer settings as
follows:
(CENTER
FREQUENCY]
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.20
MHz
[FREQUENCY
SPAN)
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100 HZ
[REFERENCE LEVEL)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . + 10
dBm
Set the frequency synthesizer for an output frequency of 20.000
MHz and an output power level of + 10
dBm.
Set the amplitude
increment for 10
dB
steps.
Connect equipment as shown in Figure 5-l.
Press MARKER
[PEAK
SEARCH),
(jMKRj,
CMKR
---f
REF
LVL)
to
center the signal on the display.
Press SWEEP (SINGLE)
on
the spectrum analyzer and wait for the
sweep to be completed.
Press MARKER
CPEAK
SEARCH),
MARKER
Ia].
Step the frequency
synthesizer output amplitude down 10
dB.
On the spectrum analyzer, press SWEEP
C-1
and wait until
the sweep is completed. Press MARKER
CPEAK
SEARCH),
and record
the marker A amplitude (a negative value) in column 2 of
‘Ihble
5-1.
Repeat steps 8 and 9, decreasing the output of the frequency
sythesizer in 10
dB
steps from -10
dBm
to -80
dBm.
Subtract the value in column 1 from the value in column 2 for
each setting to find the fidelity error.
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
s&O.8
dB.
dB
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
Set the frequency synthesizer amplitude to + 10
dBm.
Option 857 5-3
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