Model
8901B
Adjustments
Adjustment
8
ALC
REFERENCE
0
Service
Sheet
8
Description
The
ALL!
reference voltage
is
adjusted while monitoring
it
with the internal voltmeter.
Procedure
1.
Connect the CALIBRATION
RF'
POWER OUTPUT
to
the INPUT. (The CALIBRATION
RF'
POWER OUTPUT
can
be connected either
to
a
sensor module or directly
to
the Modulation
Analyzer's INPUT.)
2.
Press the blue key then press INSTR
PRESET
(the AUTOMATIC OPERATION key)
to
preset
the instrument. Key in 45.16 SPCL
to
turn
on
the
RF'
power calibrator.
(This
provides a signal
for the Modulation Analyzer's input.) Key in 49.
S
(Shift)
1
SPCL
to
connect the internal
voltmeter
to
a node which represents the average
IF
level which the
ALC
loop forces
to
equal the
ALC reference.
3.
Adjust A6R65 (ALC REF) for
a
display
beheen 2.0970
to
2.1030.
Adjustment
8
5-15
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