HP 8568B, Руководство по испытаниям и регулировке работы, Страница: 72 / 313

15. Spurious Responses Test
SPECTRUM ANALYZER
SYNTHESIZED
ATTENUATOR
300 MHZ LPF
Figure 2-25. Harmonic Distortion Test Setup
Note
Equipment listed is for two test setups, Figure 2-25 and Figure 2-26.
Equipment
Synthesized Sweeper . . . . . . . . . . . . . . . . . . . . . . . . HP
Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . H P
10 Attenuator (2
required) ..............
: Opt 010
Filter (300 MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . HP 0955-0455
Adapter, Type N
(m)
to BNC (f) (2
required)
. . . . . . . . HP 1250-0780
Adapter, Type N
(m)
to SMA (f) . . . . . . . . . . . . . . . . . . . . HP 1250-1250
Adapter, Type N (f) to BNC (m) . . . . . . . . . . . . . . . . . . . . HP 1250-0077
Adapter, Type N (f) to BNC (f) . . . . . . . . . . . . . .
. . . . . . . HP 1250-1474
Directional Bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP
Filter (50 MHz) (2
required) .......
. . . . . . . HP 0955-0306
Procedure Harmonic Distortion
1. Connect equipment as shown in Figure 2-25.
2. On the spectrum analyzer, press
PRESET
).
Set the controls of
the spectrum analyzer as follows:
CENTER FREQUENCY . . . . . . . . . . . . . . . . .
280
MHz
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . 10
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3. On the synthesized sweeper, key in
PRESET
],
280
MHz,
(
P O W E R L E V E L
)
- 1 0
4. On the spectrum analyzer, key in DISPLAY LINE -90
MARKER
[
PEAK
to position a marker on the peak of
the displayed 280 MHz signal.
5. On the synthesized sweeper, press
LEVEL
]
and use the
ENTRY knob to adjust the amplitude of the displayed 280 MHz
Performance Tests