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Set the A SWEEP TIME/DIV so that several cycles of the
waveform are displayed. Pull out the SLOPE switch to
affect the S T A R T S AFTER DELAY mode.
When the HORIZ DISPLAY is set to A L T , the magnified
portion of the waveform will appeared intensified on the
CRT display. Adjust the T POSITION and • T R A C E SEP
controls to shift the waveform to desired position.
Use the DELAY TIME MULT to shift the intensified por-
tion of waveform to correspond with the section to be
magnified for observation. Use the B SWEEP TIME/DIV
to adjust intensified portion to cover the entire portion to
be magnified.
Time measurements are performed in the same manner
from the B sweep as was described above for A sweep
time measurements.
The apparent magnification of the intensified waveform
section is the A SWEEP TIME/DIV divided by the B
SWEEP TIME/DIV.
Using the formula:
The apparent magnification _
of the intensified waveform
Intensity modulation area
[EXAMPLE]
In the example, the A SWEEP TIME is 2 /is and the B
SWEEP TIME is 0.2 /is. (See Fig. 28)
Substituting the given value:
Apparent magnification ratio = —
A SWEEP TIME/DIV setting
SWEEP TIME/DIV setting
B
A Sweep
B Sweep
Fig. 28
v
o
1 O "
6
= 10
0 . 2 x 1 0 -
6
With the above magnification, if the magnification ratio is
increased, delay jitter will occur.
To achieve a stable display, set the B MODE to TRIGGER
and used the triggered mode of operation.
1. Perform the above steps 1 through 3.
2. Push the SLOPE switch to cancel the S T A R T S AFTER
DELAY mode and set the B MODE to TRIGGER.
3. Select the HORIZ DISPLAY to either A L T or B DLY'D.
The apparent magnification will be the same as describ-
ed above.
D E L A Y E D S W E E P T I M E M E A S U R E M E N T
Using the B sweep, high accuracy time measurements can
be made.
1. Apply a signal to INPUT jack and set the vertical MODE
to the channel to be used. Adjust the VOLTS/DIV and
the other controls if necessary to obtain an easily
observed waveform display.
Set the A VARIABLE control to C A L position.
2. Adjust the A SWEEP TIME/DIV to display the portion of
waveform to be measured. Pull out the SLOPE switch to
affect the S T A R T S AFTER DELAY mode.
Select the HORIZ DISPLAY to A L T and adjust the B
SWEEP TIME/DIV for as small as possible an intensified
region.
3. Using the •
POSITION control adjust the waveform
position so as to intersect with the center horizontal line
on the C R T screen. Use the DELAY TIME MULT so that
the intensified portion of waveform touches the center
horizontal line and record the settng of the DELAY TIME
MULT at this point.
4. Use the DELAY TIME MULT to adjust intensified portion
to same point of the second waveform.
The waveform period is the second dial reading minus
the first dial reading multiplied
TIME/DIV setting.
Using the formula:
Period = (2nd dial reading — 1st dial reading)
x Delayed sweep time (A SWEEP TIME/DIV setting)
-Delay time
by the A
SWEEP
Fig. 29
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