Calibration Display; Test Setup - HP 182C Operating And Service Manual

Model 182C
Adjustments
Figure
5-3.
Calibration Display
5-35.
GAIN
ADJUSTMENT (ALTERNATE
PROCEDURE).
5,
Set controls as follows:
HORIZONTAL
DISPLAY
EXT
HORIZONTAL MAGNIFIER
XI
EXT VERNIER
CAL
b.
Check
+100V
supply
for -t-IOOV +0.1 V.
c.
Alternately
connect and disconnect 40-kilohm 0.1%
1/2W
resistor
between
+100V
supply
and
emitter of
A5Q3. Keep
connection lead length short
as
possible to
avoid
stray
pick-up or
oscillations.
h.
Adjust
Time
Base
1
msec
calibration
adjustment
to
obtain display of eleven markers
in
10
divisions.
Second
marker should
be
on 2nd
graticule
line
and 10th marker
on
10th
graticule
line.
i.
Set
HORIZONTAL
MAGNIFIER
to
X10.
j.
Adjust
X10
Gain
adj
A5R44
to obtain a display
of
exactly
1
marker
for 10
divisions.
k.
Disconnect
Time Mark
Generator.
5-36.
PHASE ADJUSTMENT,
a.
Set
controls as follows:
Phase/Bandwidth Switch
Phase
HORIZONTAL MAGNIFIER
XI
HORIZONTAL
DISPLAY
EXT
EXT VERNIER
CAL
b.
Connect
10
kHz
sine
wave
output
of Oscillator to
HORIZONTAL
EXT
INPUT
and
to
Vertical plug-in
Channel
A
input
(
Figure
5-4).
Note
Channel
A
of
a
multi-channel
Vertical
plug-in
is
normally used
for phase
measurement.
If
another channel must
be
used
connect
Oscillator to that
channel
instead of
Channel
A.
c.
Adjust
Oscillator output
to
obtain
a 8-div display.
With
resistor
disconnected.
+1(X)V
is
present
at
open
lead
of
resistor.
Do
not leave resistor
connected throughout
adjustment
as
thermal
rise will
shift
current reference.
d.
Adjust
HORIZONTAL POSITION
to center
left
hand spot exactly
on
left-hand (first) vertical
graticule
line.
e.
While
alternately connecting
and
disconnecting
re-
sistor
to emitter
of
A5Q3,
adjust
XI Gain
adj
A5R46
for
exactly
10 major
divisions of separation
between
spot
positions.
f.
Set
HORIZONTAL
DISPLAY
to
INT
and
Time
Base
for
1
msec/div
sweep
speed.
g.
Apply
1
msec markers
from Time Mark
Generator
to Vertical input.
Figure
5-4.
Phase Adjustment
Test
Setup
5-7