HP 8568B, Руководство по испытаниям и регулировке работы, Страница: 56 / 313

10. IF Gain Uncertainty Test
Equipment
Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP
Adapter, Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . HP 1250-0780
Procedure 1.
2.
3.
4.
10 Gain Steps 5.
6.
7.
8
9
10.
11.
12.
Press
Connect CAL OUTPUT to SIGNAL INPUT.
Press 8. Adjust AMPTD CAL for a MARKER amplitude of
-10.00
Press
PRESET
).
Set the frequency synthesizer for an output frequency of
MHz and an output power level of -2.0
Set the amplitude
increment for 10 steps.
Connect the equipment as shown in Figure 2-17.
Key in analyzer settings as follows:
FREQUENCY
)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.001
MHZ
SPAN
) . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kHz
Press MARKER
(
PEAK
or adjust
(
CENTER FREQUENCY
) to
center signal trace on display.
Set analyzer as follows:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Hz
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
LOG
dB/DIv] . . .
. . . . . . . . . . . . . . . . . . . . . . . 1
Press MARKER
SEARCH
),
Press to permit extended reference level settings.
Set the analyzer
(
REFERENCE
and frequency
synthesizer amplitude according to 2-12 settings. (Use the
frequency synthesizer for 10 steps.) At each setting, note
the
MKR A amplitude displayed in the upper right corner of the
analyzer display (deviation from
the
0 reference setting) and
record it in
the
table. See Figure 2-18.
Note
After measurement at the
(
REFERENCE LEVEL
)
= -70 setting, press
as indicated in 2-12.
2-34 Performance Tests