HP 182C Operating And Service Manual page 34

Adjustments
Model 182C
d.
Rotate
INTENSITY
control
cw
for a gate
amplitude
of
6
divisions (approximately GOV).
e.
Adjust
Gate Resp Adi No.
2
A7C6
and Gate Resp
Adj No.
1
A7C8
for
optimum
fast
risetime
and
pulse
flat-top response.
f.
Disconnect Monitor Oscilloscope.
5-32.
DCBALANCE-
a.
Set
MAGNIFIER
to
X10.
b.
Set
DISPLAY
to
EXT.
c.
Center spot with
POSITION
control.
d.
Set
MAGNIFIER
to
XI.
e.
Adjust
DC
Bal adj
A5R49
to recenter spot.
f.
Repeat
steps a
through
e until
spot
does not
shift
from
center
while switching
MAGNIFIER
fiom XI
to
XIO.
5-33. VERNIER BALANCE.
a.
Set
MAGNIFIER
to
XI.
b.
Rotate
EXT VERNIER
from
CAL
position to fully
ccw.
c.
Center
spot
with
POSITION
control.
d.
Set
EXT VERNIER
to
CAL.
e.
Adjust
Vern
Bal
adj
A5Rlt
to
recenter
spot.
f
Repeat
steps
b
through
e until spot
does not
shift
from
center
when
EXT VERNIER
is
rotated.
5-34.
GAIN ADJUSTMENT.
of
A5Q3
artd
adjusting for the
spec-
ified deflection.
An
alternate
method
not
requiring
use of
HP
Model
1041
1A
Horizontal Gain
Calibrator
is
provided.
a.
Set controls
as follows;
DISPLAY
EXT
MAGNIFIER
XI
EXT VERNIER
CAL
b.
Check
-i-IOO-volt supply
for -t-IOOV lO.I V.
Note
The
calibrating accuracy
of
the
Model
10411
A
Horizontal
Gain
Calibrator
used
for
this
adjustment procedure
is
determined by
the accuracy
of the
-flOOV
supply.
If
the power
supply
is
not -flOOV
±0.1V.
the gain
adjust-
ment
will
be out
of tolerance.
c.
Connect
Horizontal Gain
Calibrator
as follows:
1.
Black
lead: connect
to chassis (power
supply
ground).
2.
Yellow
lead:
connect
to
emitter
of
A5Q3.
3.
Red
lead: connect
to
-f
100
volt supply.
d.
Set Horizontal
Gain
Calibrator magnifier switch to
XI.
e.
Display should be
a bright spot near each
side of the
display. Adjust
HORIZONTAL
POSITION
to center
left-
hand
spot exactly
on
left-hand
(first) vertical graticule
line.
f.
Set
INTENSITY
and
FOCUS
to obtain low
intensity
sharply focused
spots.
g.
Adjust
X
1
Gain Adj
A5R46
for exactly 10
divisions
of separation
between
spots (Figure 5-3).
h.
Set
MAGNIFIER
to
XIO
and
Horizontal Gain
Calibrator magnifier switch to XIO.
This adjustment
is
critical
if
Time
Base
interchangeability
is
desired
*•
Adjust
XIO
Gain
adj
A5R44
for exactly lOdivisions
without
recalibration. Critical adjust-
of separation
between
spots,
ment
is
achieved
by
Injecting a precise
current into the emitter-base junction
j.
Disconnect Horizontal Gain
Calibrator.
5-6