HP 182C - Calibration Display; Test Setup

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