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10. IF Gain Uncertainty Test
Equipment
Frequency Synthesizer
.....................................HP
3335A
Adapter, Type N (m) to BNC (f)
........................
HP 1250-0780
Procedure 1.
2.
3.
4.
10 dB Gain Steps
5.
6.
7.
8
9
10.
11.
12.
Press
(
INSTR
pfwm-).
Connect CAL OUTPUT to SIGNAL INPUT.
Press
Cm]
8. Adjust AMPTD CAL for a MARKER amplitude of
-10.00 dBm
50.02
dB.
Press
(1~~733
PRESET).
Set the frequency synthesizer for an output frequency of 20.0010
MHz and an output power level of -2.0 dBm. Set the amplitude
increment for 10
dB
steps.
Connect the equipment as shown in Figure 2-17.
Key in analyzer settings as follows:
CCENTER
FREQUENCY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.001 MHZ
CFREQUENCY
SPAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kHz
Press MARKER
(PEAK
SEARCH).~~)
or adjust
(CENTER FREQUENCY) to center signal trace on display.
Set analyzer as follows:
[V’DEO-
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Hz
(j-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 kHz
LOG
CENTER
dB/DIv]
. . . . . . . . . . . . . . . . . . . . . . . . . . 1
dB
Press MARKER [PEAK SEARCH),
Press
(SHIFT),(m]I
to permit extended reference level settings.
Set the analyzer (REFERENCE
LEVEL],(VIDEO],
and frequency
synthesizer amplitude according to
Table
2-12 settings. (Use the
frequency synthesizer
@J
for 10
dB
steps.) At each setting, note
the MKR A amplitude displayed in the upper right corner of the
analyzer display (deviation from
the 0
dB
reference setting) and
record it in the table. See Figure 2-18.
Note
After measurement at the (REFERENCE LEVEL) = -70 dBm setting, press
[SHIFT),(ENTER
dB/DIvP
as indicated in
‘lhble
2-12.
2-34 Performance Tests