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Model
8672A
Table 3-3.
Local Operator's Checks
(4 of 4)
OPERATIC NtCont'd)
19.
Set the
RF
switch
^
to ON. Adjust the
CAL
control
@
for
a
steady indication
of
the Meter
Q
.
This
adjusts
the loop gain and prevents unwanted oscillations. The
ALC Block
^W
annunciator
LEV
UNCAL
lights
when oscillations occur or the loop opens,
causing unleveling
to
occur.
20.
Set the
RF
switch
^M
to
OFF.
Disconnect the power meter
and
power
sensor.
21.
Connect
a
crystal
detector
as
shown in Figure 3-4. Set the
ALC
selector
^^
to
XTAL.
NOTE
The output
voltage
from
the crystal detector may
be
either
negative
or
positive
polarity.
22.
Set
the
RF
switch
^M
to ON and adjust the CAL control
^ff
for
a
steady indication on the
Meter
Q
23.
Set
the
RF
switch
ffb
to OFF. Disconnect
the test
setup.
MICROWAVE SYNTHESIZER
----__-
POWER
i
RECORDER,
METER
'
OUTPUT
'
I————I
POWER
SENSOR
RF
OUTPUT
Figure
34.
Operator's External
ALC
Checks Test
Setup
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