5. DC Log Amplifier Adjustments
Procedure
1. Set the HP 8560A
m
switch to off. Remove the analyzer cover and place the analyzer in
the service position as illustrated in Figure 2-6. See Figure 2-7 for adjustment location.
2. Connect the HP 3335 50
0
output to the HP 8560A 50
0
input. Set the HP 8560A (LINE)
switch on.
3. Set the HP 8560A controls as follows
CENTERFREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...15 MHz
SPAN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..O
REF LVL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-1OdBm
dB/DIV
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..ldB/DIV
RES BW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300kHz
IF Adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . off
4. Set up an HP 3335A as follows:
FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...15 MHz
AMPLITUDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -18dBm
5. Press
ICAL),
ADJ CURR IF STATE , wait for the analyzer to complete adjustments then press
m.
6. Adjust A4R445 for maximum on-screen amplitude. Refer to Figure 2-7 for the location of
A4R445.
A4 Linear Fidelity Adjustment
This adjustment consists of adjusting A4R544 until the delta marker reads -40 dB under the
following conditions.
Procedure
1. Set the HP 8560A (LINE) switch to off. Remove the analyzer cover and place the analyzer
in the service position as illustrated in Figure 2-6. See Figure 2-7 for adjustment location.
2. Connect the HP 3335 50
R
output to the HP 8560A 50
R
input. Set the HP 8560A
m
switch on.
3.
Press(PRESET)(AMPLITUDE),
LINEAR, MORE 1 of 3, AMPD UNITS,dBm,(CAL),
IF ADJ OFF.
4. Set the HP 8560A controls as follows:
CENTERFREQ
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...15 MHz
SPAN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...5 MHz
RES BW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300kHz
REF LVL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-1OdBm
5. Set up an HP 3335A as follows:
FREQUENCY
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...15 MHz
AMPLITUDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -18dBm
6. Press [PEAK SEARCH), MARKER DELTA .
2-30 Adjustment Procedures
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