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Model
1331A
Adjustments
Table
5-2. Low
Voltage
Power
Supply Adjustments
Voltage
Ripple
-50
±0.02V
<2
mV p-p
+50
±lV
<2
mV
p-p
+158
±4V
<50
mV
p-p
+12.6
±0.
l
V
<1.5
mV
p-p
5-44. ADJUSTMENT.
5-45.
The following paragraphs describe
procedures
to
calibrate
Model 1331A so that
it
will
perform
as
specified in Section I. For complete calibration, the
entire adjustment procedure should be followed
in
sequence;
individual
adjustments can be made by
following the steps outlined in the appropriate para-
graphs. Adjustment controls are shown on a fold-out
illustration at the end of this section.
5-46. Use a
nonmetallic
screwdriver and recently
calibrated test equipment
with
characteristics
as
specified in table 5-1. After adjustments are com-
plete,
check
instrument performance by
accomplish-
ing the performance checks described earlier in this
section.
NOTE
The following
adjustment
procedures
are
for instruments whose input
attenua-
tors have not been modified as described
in Section II. Refer to paragraph 5-87
for instructions on calibration
of
modi-
fied instruments.
5-47.
LOW VOLTAGE
POWER SUPPLY ADJUST-
MENTS.
5-48. Reference. Schematics 1 and 2, tables 5-1
and 5-2, and
figure
5-4.
5-49.
Equipment.
Digital voltmeter.
5-50. Procedure. Make voltage adjustments and
checks as.shown in table
5-2.
Make -50V
adjustment
first because other outputs are referenced to -50
volt power supply.
5-51.
HIGH VOLTAGE
POWER
SUPPLY
ADJUST-
MENT.
5-52.
Reference. Schematic
3,
table
5-1,
and
figure
5-4.
Test
Point
Adjustment
A5Jl-4
AlR22
A5Jl-2
none
Q3-E (red
lead)
none
Q4-E (black
lead)
A5Rl8A
5-53. Equipment.
a. Digital voltmeter.
b.
1000:1 divider probe.
5-54.
Procedure.
a.
Monitor
-50V power supply
using 1000:1
divider probe and digital voltmeter.
b.
Multiply
voltage
reading
from step a by 58.3.
c. Monitor output of
high
voltage
power
supply
(yellow
wire on A3).
d. Adjust h v adj A3R8 to
achieve
voltage reading
equal
to result
obtained
in
step
b.
5-55.
WRITE DEPTH ADJUSTMENT.
5-56.
Reference. Schematic 7, table
5-1,
figure
5-3,
and figure
5-4.
5-57.
Equipment.
Oscilloscope.
5-58.
P
rocedure.
a. Set Model
1331A
controls as follows:
WRITE...................
....
.
....
.
.....
in
INTENSITY
.
.
. .
. . . . . . . . . .
.
. .
.
. . . . . .
.
. .
ccw
PERSISTENCE. . . .
. .
. . .
. .
.
.
. . . .
.
. . . .
.
.
ccw
POSITION
(HORIZ
and VERT).
.
. . centered
-,-
PULSE
HEIGHT
+ 3 e 5 V - - l
1331A/C-A-13
Figure
5-3.
Write Depth Waveform
5-7
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