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Intensity modulation area
Fig. 3 2
[ E X A M P L E ]
In the example, the A SWEEP TIME is 2 fis and the B
SWEEP TIME is 0.2 fis. (See Fig. 32)
Substituting the given value:
Apparent magnification ratio =
With the above magnification, if the magnification ratio is
increased, delay jitter will occur.
To achieve a stable display, set the B MODE to TRIG and
used the triggered mode of operation.
1. Perform the above steps 1 through 3.
2. Set the B TRIG MODE to TRIG.
3. Set the HORIZ MODE to either A L T or B. The apparent
magnification will be the same as described above.
DELAYED SWEEP TIME MEASUREMENT
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 SWEEP VARIABLE to C A L position.
2. Adjust the A SWEEP TIME/DIV to display the portion of
waveform to be measured. Set the B TRIG MODE to
AFTER DELAY mode.
Set the HORIZ MODE to INT 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 CRT 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.
A S w e e p
B S w e e p
6
2 x 10~
= 10
0.2 x 10"
6
by the A
SWEEP
Using the formula:
Period = (2nd dial reading — 1 s t dial reading)
x Delayed sweep time (A SWEEP TIME/DIV setting)
Delay time
Fig. 3 3
[ E X A M P L E ]
For the example the first dial setting is 1.01 and the second
is 6.04. The setting of A SWEEP TIME/DIV is 2 ms. (See
Fig. 33)
Substituting the given value:
Period = (6.04 - 1 . 0 1 ) x 2 (ms) = 10.06 ms
PULSE WIDTH MEASUREMENTS
SWEEP
This method is similar to the time measurement method
and
can
be
used for
measurements.
1. Apply the pulse signal to the INPUT jack and set the ver-
tical MODE to the channel to be used.
2. Use the VOLTS/DIV, VARIABLE and w POSITION con-
trols to adjust the display such that the waveform is
easily observable with the center of the pulse width
coinciding with the center horizontal graduation line.
Set the SWEEP VARIABLE to C A L position.
3. Set the A SWEEP TIME/DIV to display the portion of the
waveform to be measured, set the B TRIG MODE to
TRIG.
Set the HORIZ MODE to INT, and adjust the B SWEEP
TIME/DIV for as short as possible an intensified section
of waveform.
4. Using the DELAY TIME MULT, adjust the display so that
the intensified portion touches the center horizontal
graduation line of the C R T screen and record the dial
setting at this point.
5. Using the DELAY TIME MULT adjust the falling edge of
the pulse so that it touches the center horizontal gradua-
tion line and is intensified.
The pulse width is the second dial reading minus the first
dial reading multiplied by the A SWEEP TIME/DIV set-
ting.
Using the formula:
Pulse width = (2nd dial reading-1st dial reading)
x Delayed sweep time (A SWEEP TIME/DIV setting)
USING DELAYED
high
accuracy pulse
width
2 7
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