HP 8566B Adjustment Manual page 53

8. Amplitude Fidelity Test
2-28 Performance Tests
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 dBm. Set the amplitude
increment for 10 dB steps.
2. Connect equipment as shown in Figure 2-l 1.
3. Press [mj on the analyzer. Key in analyzer settings as
follows:
[
CENTER FREQUENCY
( ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
FREQUENCY SPAN
( ]
REFERENCE LEVEL
[
4. Press MARKER
PEAK SEARCH
center the signal on the display.
5. Key in the following analyzer settings:
FREQUENCY SPAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. Press MARKER Ia]. 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 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 dB
to -80 dB. The result should be 51.0 dB
9. Subtract the greatest negative fidelity error from the greatest
positive fidelity error for calibrated amplitude steps from -10 dB
to -90 dB. The result should be 5 1.5 dB
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . + 10 dBm
], I-1, [MKR +
to
REF
.O Hz