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[ 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. 29)
Substituting the given value:
Period = ( 6 . 0 4 - 1 . 0 1 ) x 2 (ms) = 10.06 ms
PULSE WIDTH MEASUREMENTS USING DELAYED
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 T 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 A VARIABLE to C A L position.
3 . Set the A SWEEP TIME/DIV to display the portion of the
waveform to be measured. Pull out the SLOPE switch to
affect the S T A R T S AFTER DELAY mode. Adjust the •
POSITION and •
T R A C E S E P controls to shift the
waveform to desired position.
Select the HORIZ DISPLAY to A L T , 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)
[EXAMPLE]
In the example, the first dial reading is 0.61 and the second
is 5.78 with the A SWEEP TIME/DIV setting at 2 /is.
Substituting the appropriate values. (See Fig. 30)
Pulse width = ( 5 . 7 8 - 0 . 6 1 ) x 2 (ps)= 10.34 /is
26
high
accuracy pulse
width
Fig. 30
FREQUENCY MEASUREMENTS USING DELAYED
S W E E P
The frequency is obtained as the reciprocal of the period of
one cycle.
1. Measure the period of the waveform using the pro-
cedure described above for time measurement.
2. The frequency is then the reciprocal of the period
measured.
Using the formula:
Freq =
Period
[EXAMPLE]
For the example, the period measured is 4 0 . 2 /ts, making
the frequency simply. (See Fig. 31)
Substituting the given value:
Freq = 1 / ( 4 0 . 2 x 1 0
6
) = 2 4 . 8 8 kHz
Fig. 31
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