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Operation
Model
8672A
Table 3-4. Local Operating Instructions
(4
of
4)
SETTING EXTERNAL ALC WITH
A
POWER
METER OR CRYSTAL DETECTOR
(Cont'd)
NOTE
If
the HP 43GA Power Meter
is
to be used, set
the Synthe¬
sizer's
output
level
to
—1
dBm
with
the
ALC
selector
offset
to
INT.
Depress the
RANGE HOLD
pushbutton on the 43GA.
If
the
RANGE HOLD
pushbutton
is
not
depressed,
the power
meter
may
slowly oscillate
due to autoranging.
5.
Set the
OUTPUT LEVEL RANGE
control
Q)
and the
VERNIER
control
^)
for
the
desired
power
level.
6.
Adjust the
CAL
control
^ff
to obtain
a
stable, leveled
power output 10 dB below the output
level
indicated by the
RANGE
dBm
display
^f
and the
indication on the Meter
Q
.
The 10 dB
offset
places
the
ALC
loop in the center
of
its
dynamic
range.
3-12
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