8. Option 857 Amplitude Fidelity Performance
Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3335A
Adapter, Type N (m) to BNC (f) . . . . . . . . . . . . . . . . 1250-0780
BNC Tee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-0781
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
9 and adjust the FREQ ZERO pot for
maximum amplitude.
Press
on the analyzer. Key in analyzer settings as
follows:
MHz
100
HZ
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . + 10
Set the frequency synthesizer for an output frequency of 20.000
MHz and an output power level of + 10
Set the amplitude
increment for 10
steps.
Connect equipment as shown in Figure 5-l.
Press MARKER
to
center the signal on the display.
Press SWEEP (SINGLE)
on
the spectrum analyzer and wait for the
sweep to be completed.
Press MARKER
MARKER
Step the frequency
synthesizer output amplitude down 10
On the spectrum analyzer, press SWEEP
and wait until
the sweep is completed. Press MARKER
and record
the marker A amplitude (a negative value) in column 2 of
5-1.
Repeat steps 8 and 9, decreasing the output of the frequency
sythesizer in 10
steps from -10
to -80
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
to -70
The results should be
Subtract the greatest negative fidelity error from the greatest
positive fidelity error for calibrated amplitude steps from -10
to -90
The results should be
Set the frequency synthesizer amplitude to + 10
Option 857 5-3
