HP 8568B, Руководство по испытаниям и регулировке работы, Страница: 74 / 313

15. Spurious Responses Test
Intermodulation
Distortion
Figure 2-26. Intermodulation Distortion Setup
11. Connect equipment as shown in Figure 2-26.
12. Set the controls of the spectrum analyzer as follows:
CENTER FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.5 MHz
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 MHz
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20
DISPLAY LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
13. On the synthesized sweeper, key in 30 MHz,
[
POWER LEVEL
],
-4 and use the ENTRY knob to position
the
peak of
the
displayed 30 MHz signal at the top CRT graticule line.
14. On the frequency synthesizer, key in
[
FREQUENCY
)
29 MHz,
-4 Readjust the signal amplitude as necessary
to position the peak of the displayed 29 MHz signal at the top CRT
15. Set the controls of the spectrum analyzer as follows:
CENTER FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 MHz
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 Hz
16. On the spectrum analyzer, key in DISPLAY LINE (ENTER) -100
MARKER
[
PEAK SEARCH
)
to position a marker
on
the peak of
the displayed 29 MHz signal.
17.
18.
19.
On the frequency synthesizer, adjust the signal amplitude for a
marker indication of -20.00
On
the
spectrum analyzer, key in
[
CENTER FREQUENCY
)
30 MHz,
MARKER
[
PEAK SEARCH
)
to position a marker on the peak of the
displayed 30 MHz signal.
On the synthesized sweeper, adjust
the
signal power level for a
marker indication of -20.00
graticule line.
2-52 Performance Tests