HP 182C Operating And Service Manual page 33

Model
182C Adjustments
5-26.
HIGH
VOLTAGE POWER
SUPPLY ADJUSTMENT.
a.
The
required high voltage output of the supply
is
-3150V
±0.5%.
b.
Using 1000:1 Divider Probe, monitor
voltage at
—100V
test
point
A1
A2TP4
with
Digital
Voltmeter.
c.
Note
voltage reading
which
will
be approximately
— O.IOOV. Accuracy
in
noting the voltage
is
essential for
proper adjustment.
d.
Multiply reading
obtained
in
step c by 31.50.
This voltage
is
dangerous to
life.
e.
Using 1000:1 Divider Probe,
monitor
high voltage
at
—3150V
test
point
A6TP1
with
Digital
Voltmeter.
f.
Set High Voltage
adj
A10R3
to obtain reading
exactly equivalent to
result
obtained
in
step
d
(approxi-
mately -3.150V).
5-27.
INTENSITY LIMIT
ADJUSTMENT.
a.
Set
DISPLAY
to
EXT.
b.
Set
INTENSITY
control
to
center (12 o'clock)
position.
c.
Adjust Intensity
Limit
Adj
A6R2
to just
extinguish
spot.
S28.
ASTIGMATISM ADJUSTMENT.
3.
Set
DISPLAY
to
EXT.
b.
Center low
intensity
spot with
HORIZONTAL
and
Vertical
POSITION
controls.
c.
Adjust
FOCUS
and
ASTIG
front-panel screwdriver
adjustment
for smallest
round
spot.
5-29.
FLOOD GUN
ADJUSTMENT.
a.
Set
INTENSITY
fully ccw.
b.
Set
SCALE
fully
cw,
c.
Adjust
SCALE PATTERN ADJ A2R4
for uniform
Illumination Intensity.
d.
Slowly
rotate
SCALE
control while adjusting
SCALE
PATTERN
ADJ A2R4
as necessary to
maintain uniform
illumination intensity throughout
entire range of
SCALE.
5-30.
TRACE ALIGNMENT ADJUSTMENT.
a.
Set
MAGNIFIER
to
XI.
b.
Set
EXT COUPLING
to
AC.
c.
Connect
Oscillator
400
Hz 10V
output to
EXT
INPUT.
d.
Position trace
on
center horizontal
graticule line
e.
Set
INTENSITY
and
FOCUS
to
view
sharply defined
trace.
f.
Adjust
TRACE
ALIGN
front-panel screwdriver
ad-
justment
A2R23
to align trace parallel to horizontal
graticule
line.
g.
Connect
Oscillator
400 Hz 10V
output
to Vertical
plug-in.
h.
Set Vertical plug-in controls
to obtain vertical
trace.
i.
Adjust
Y ALIGN
adj
A5R61
to
align vertical
trace
parallel to vertical graticule
line.
Note
Exact adjustment
is
very important
if
repeatable risetimes are to
be
ob-
tained
inboth-rUP and
—UP
operation.
j.
Disconnect
Oscillator
from
Vertical plug-in input.
5-31.
GATE
AMPLIFIER RESPONSE ADJUSTMENT,
a.
Set following controls as applicable:
DISPLAY
INT
Main Time/Div
0.1
^.iscc
Main
Vernier
CAL
Sweep
Mode
AUTO
Sweep
Display
MAIN
Delayed Time/Div
OFF
h.
Set
Monitor
Oscilloscope controls as follows:
Volls/Div
2
Time/Div
0,1
psec
Trigger Source
INT
Slope +
Coupling
DC
c.
Using 50:1 Divider Probe and Monitor
Oscilloscope,
observe
signal at collector of
A7Q8.
5-5