HP HP 8566B, Руководство по настройке

Страница: 53 / 405

8. Amplitude Fidelity
Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3335A
Adapter, Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-0780
Log Fidelity
1. 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.
2. Connect equipment as shown in Figure 2-l 1.
3. Press on the analyzer. Key in analyzer settings as
follows:
[
CENTER FREQUENCY
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MHz
(
FREQUENCY SPAN
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(
REFERENCE LEVEL
] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . + 10
4. Press MARKER [
PEAK SEARCH
],
REF
to
center the signal on the display.
5. Key in the following analyzer settings:
FREQUENCY SPAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.O Hz
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Hz
6. Press MARKER Step the frequency synthesizer output
amplitude from + 10 to -80 in 10 steps, noting
the MARKER A amplitude (a negative value) at each step and
recording it in column 2 of Table 2-12. Allow several sweeps after
each step for the video filtered trace to reach its final amplitude.
(See Figure 2-12.)
7. Subtract the value in column 1 from the value in column 2 for
each setting to find the fidelity error.
8. Subtract the greatest negative fidelity error from the greatest
positive fidelity error for calibrated amplitude steps from -10
to -80
The result should be
9. Subtract the greatest negative fidelity error from the greatest
positive fidelity error for calibrated amplitude steps from -10
to -90
The result should be 1.5
2-28 Performance Tests