HP 182C - 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