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Adjustments
Model
8672A
ADJUSTMENTS
5-37.
ALC
Adjustments (Cont'd)
14.
Set
the
OUTPUT LEVEL RANGE
switch to
0
dBm; Adjust the
OUTPUT RANGE
VERNIER
to exactly
0
dBm. Record the power meter reading.
___________
dBm.
15.
Tune
the Synthesizer
to 10 000 MHz and
adjust Slope 10
GHz
A1A7R18
for
the
same
power
reading recorded in
step
14.
16.
Tune to 18 000
MHz
and adjust Slope
18 GHz
A1A7R4
for the
same
power
read¬
ing
recorded in
step
14.
17.
Tune between
8000
and 12
000 MHz
(1
MHz
tuning resolution).
18.
Adjust
Slope 10
GHz
A1A7R18
to make the power variation symmetrical about
OdBm.
19.
Tune between 17 000 and
18
000 MHz
and adjust Slope 18 GHz
A1A7R4
to make
the variation symmetrical about
0
dBm.
20.
Tune from
2000
to 18
000 MHz to
ensure flatness
is
within
specification. Reset
the power meter's calibration factor switch
as
needed.
5-38.
External Leveling Adjustments
REFERENCE:
Service
Sheet 4-A1.
DESCRIPTION:
EQUIPMENT:
PROCEDURE:
These adjustments are made to
minimize
dc
offset and to center the operating
range
of
the external leveling circuitry.
HP
3455A
Digital
Voltmeter
Power Meter/Sensor
50 Ohm Termination
HP-IB
Controller
.
.
HP
436A/8481A
HP
11593A
HP
9830A
or HP
9825A
with HP
11712A.
Tune to 4000
MHz.
1.
2.
3.
4.
5.
6.
7.
Center the
EXT
ALC INPUT CAL
control.
Place
a
50
ohm BNC termination
on the
EXT ALC INPUT
connector.
Connect the
DVM
to
A1A6TP6
and
A1A6,GND2.
Adjust
EXT
OS (external offset)
AlAGRJ^-for
0.0 ±0.1 mVdc.
Disconnect
the
DVM
and 50
olim termination.
Connect the power
sensor
to the
RF OUTPUT connector;
connect the power
meter's recorder
output to
the
EXT ALC INPUT.
NOTE
Because
the
HP
436A
has
automatic
ranging, this
procedure
will
work
properly only when the range hold switch
is
activated on
the
0
dBm
range.
5-32
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