HP 436A - Page 69

Adjustments
Model 436A
.
ADJUSTMENTS
Table
5-1.
Factory
Selected
Components
Reference
Selected
For
Normal
Value
Designator
Range
A2R7,
Optimum Power Meter accuracy above
10
mW.
Measure (to 3 significant digits)
A2R7
R12, R18
the +15
and-15V
supply voltages
at
A9TP3 and TP4.
Connect
the
Range
42.2
kn
and R81
Calibrator
HP
11683A
to
the Power Meter's sensor connector. IF the
(40.0
kn
to
magnitude
of
the
-15V
supply exceeds the magnitude
of
the +15V supply
OR
42.2
kn)
IF the magnitude
of
the
+15V
supply does not exceed the magnitude
of
the
--'A~
-15V
supply by more than
0.5
Vdc, THEN select
A2R12for10.00
to
!~~o-~n\
i0.01
mW
reading with a
10
mW
input. (Increasing
A2ir!2
increases the
(20.0
kn
to
reading.)
With
100
mW
input select A2R18 and R81 for a reading
of
99.9
to
147
kn)
100.0.
(Increasing A2R18
and
R81 increases the power meter reading.) Check
A2R18
the 10
mW
and 30
mW
full scale readings and choose compromise resistor
178kr2*
values
as
necessary for a maximum
±1
count error. IF the magnitude
of
the
A2R81
+15V supply exceeds the magnitude
of
the
-15V
supply by more than 0.5V
9.09
kD*
THEN change A2R7 to
40.0kn,
and follow the previous selection procedure.
A2R50 Adjust A2R69 FREQ (Frequency Adj) for maximum indication on digital
13.3
kn
readout, then check frequency of
220
MHz
Multivibrator. If out
of
specifica- (10
kn
to
tion (220 ±16
Hz)
select value for
A2R50
to produce maximum indication on
17.8
kn)
digital readout while
220
Hz Multivibrator frequency
is
in
specification.
A8R5
A Power Reference Oscillator
output
of 1
mW
if this
value
falls
outside the
range
noon
of adjustment available with LEVEL
ADJUST
potentiometer A8R5
(noon
to
7500n)
A2VR1,2
Correct
accuracy on the
30
mW,
and
100
mW
ranges when accuracy on the other
2.37V
to
ranges
is
within specifications.
2.61V
A8VR2,
1)
If
the reference output power
is
outside the range
of
1.000 ±.007
mW
be-
5.UV-
A8R2 tween 0°C and 55°C,
and
825n
or
2)
if the A8VR2, A8R2 combination
is
5.11
V-825rl,
then change the A8VR2,
8.25V-
A8R2 combination to
8.25V-1470rl.
However, if the A8VR2, A8R2
com-
141on
bination
is
already
8.25V-1470n,
then a problem exists elsewhere.
A2C14
Proper phase detector operation with a
multivibrator frequency
of
220
Hz.
4700
pF
(2500
pF
to
10,000 pF)
NOTE:
Do
the
Power Supply
Adjustment (paragraph 5-23) first, then do the adjustments described
in
paragraphs 5-16 through 5-22.
*Combined
series
resistance
147
kn
to
500
k.Q.
5-2
Service
Sheet
7
7
14
7
14
7
••
•
•