EXTERNAL HORIZONTAL
(No Input applied)
Adjust VERTICAL GAIN
ond CENTERING to com
pletely fill the 9rotlcule
overlay from top to bottom.
GROUND
'scope V. INPUT
to BASE jock
,
.
.
i
!+·
'
DO NOT READJUST VERTICAL GAIN
AFTER OSCILLOSCOPE HAS BEEN CALIBRATED
Figure 5. Oscilloscope Vertical Calibration
7. Set the STEP SELECTOR switch of the curve
tracer to the .2 volts per step position.
8. The display should resemble that shown in
Figure 5, a series of six vertical dots, and pos
sibly a light vertical trace between dots. Adjust
the vertical gain of the oscilloscope so the dis
play exactly fills the graticule from top to bot
tom (10 divisions). Adjust the vertical centering
as required.
9. This completes vertical calibration of the oscil
loscope. ONCE THE OSCILLOSCOPE IS CALI
BRATED, DO
NOT
READJUST THE VERTICAL
GAIN. During operation, vertical positioning
may be readjusted as required, but the display
must be adjusted to the desired size by controls
on the curve tracer.
Horizontal Calibration
A horizontal calibration of 1 volt per division can
be very accurately obtained using the B (base) jack
output of the curve tracer when the STEP SELECTOR
switch is in the 1 volt per step position. The voltage
steps from O to 5 volts in 5 steps of 1 volt each
(6 steps if O volts is counted as the first step), result
ing in a series of six horizontal dots on the oscillo
scope screen. The horizontal gain can be adjusted
so the dots coincide with 5 divisions of the graticule.
This gives a full scale value of 10 volts which is
adequate for testing most small signal transistors.
Only slightly less accuracy is obtained by adjust
ing the horizontal gain for two dots per division, thus
giving a full scale value of 20 volts.
For higher test voltages, a less accurate (± 15%)
method of reading the horizontal voltage is available
by connecting the sweep voltage output of the curve
tracer (H jack) to the horizontal input of the oscillo
scope. This method will produce a horizontal trace
rather than the series of dots. The maximum sweep
voltage can be set for any desired convenient value,
6
such as SO or 100 volts, as read from the SWEEP
VOLTAGE dial. The horizontal gain of the oscillo
scope can then be set for a full scale horizontal
trace (10 divisions of the graticule. Each division
then equals 10% of the maximum sweep voltage.
Low Voltage Horizontal Calibration
(Refer to Figure 6)
1. Complete vertical calibration of the oscilloscope
as previously described.
2. Leave the oscilloscope set for external horizontal
input, and the common ground connected be
tween the curve tracer and the oscilloscope.
3. Disconnect the vertical input from the oscillo
scope. Ground the vertical input if desired.
4. Connect a test lead from one of the B (base)
jacks on the curve tracer to the horizontal input
of the oscilloscope. If the left B jack is used,
the SOCKET switch must be in the LEFT position,
and if the right B jack is used, the SOCKET
switch must be in the RIGHT position.
S. Set the STEP SELECTOR switch on the curve
tracer to the 1
volt per
step position.
6. The display should resemble that shown in
Figure 6, a series of six horizontal dots, and
possibly a light horizontal trace between dots.
Adjust the horizontal gain of the oscilloscope so
the display fills exactly 5 divisions of the grati
cule. Adjust the horizontal and vertical centering
controls as required.
7. This completes horizontal calibration of the os
cilloscope at 1 volt per division. ONCE THE
OSCILLOSCOPE IS CALIBRATED, DO
NOT
READJUST THE HORIZONTAL GAIN. During
operation, horizontal centering may be read
justed as required.
8. To calibrate the horizontal display for 2 volts
per division, follow the same procedure except
adjust the horizontal gain for two dots per divi-
