HP 436A - Power Reference Oscillator Adjustments

Adjustments
Model 436A
ADJUSTMENTS
5-20.
A-D
CONVERTER
AND
LINEAR
METER
ADJUSTMENT
(cont'd)
8.
Set
the
Power
Meter
MODE
and RANGE
HOLD
switches
to
dBm and on (in),
respectively.
NOTE
The
next
step sets the A-D
log
threshold. When the speci-
fied indication
(-10.00
dBm)
is
obtained, the digital
read-
out
should
be
just
on
the
verge
of
blanking, i.e., the readout
may
randomly alternate between
-10.00
and UNDER
RANGE,-1.
9. Set
the
Range Calibrator RANGE switch
to
-10
dBm and adjust
the
power
meter
LZR, A3R59,
for-10
dBm.
10.
Set
the
Power
Meter RANGE
HOLD
switch
to
off
(out) and
the
Range Calibrator
RANGE switch
to
1
mW.
11.
Adjust
Power
Meter
LFS
potentiometer A3R48 so
that
the digital readout indi-
cates
-0.00.
12.
Set the
Power
Meter
MODE
switch
to
WATT and adjust MTR potentiometer
A3Rl
7
so
that
the
pointer
is
aligned half way between
the
last two marks on the
meter
face.
5-21.
POWER
REFERENCE. OSCILLATOR FREQUENCY ADJUSTMENT
REFERENCE:
NOTE
Adjustment
of
the Power Reference Oscillator frequency may also affect the
output
level
of
the oscillator. Thus after the frequency
is
adjusted to
50.0
±
0.5
MHz, the
output
level should be checked
as
described
in
Section IV.
A procedure
for adjusting the
output
to the specified level
is
provided
in
the
next
paragraph.
Service Sheet
14.
DESCRIPTION:
Variable
inductor
A8Ll
is
adjusted
to
set the power reference oscillator
output
fre-
quency
to
50.0
±
0.5
MHz.
POWER
METER
COUNTER
CCC
C
11!1
Io
©
11
~
c
POWER
REF
OUTPUT
-
-
Figure
5·6.
Power
Reference
Oscillator
Frequency
Adjustment
Setup
5-8
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