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[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. 34)
Pulse width = ( 5 . 7 8 - 0 . 6 1 ) x 2 (/is) = 10.34 /is
Fig. 34
FREQUENCY
MEASUREMENTS
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 /is, making
the frequency simply. (See Fig. 35)
Substituting the given value:
Freq = 1 / ( 4 0 . 2 x 10"«) = 2 4 . 8 8 kHz
Fig. 3 5
2 8
USING
DELAYED
PULSE REPETITION TIME
Using the delayed sweep feature, reliable time measure-
ments can be made.
1. Apply a signal to the INPUT jack and set the vertical
MODE to the channel to be used.
Adjust the VOLTS/DIV to obtain a normal easy to view
display of the waveform are displayed.
2. Adjust the A SWEEP TIME/DIV so that at least two
cycles of the waveform are displayed.
Set the HORIZ MODE to INT and set the B TRIG MODE
to affect the AFTER DELAY mode of operation.
Set the B SWEEP TIME/DIV as fast a sweep speed as
possible.
3. Using the DELAY TIME MULT, adjust the intensified por-
tion to coincide with the first pulse.
Set the HORIZ MODE to A L T and use T R A C E SEPARA-
TION to adjust the waveforms for easy viewing.
4. Using the DELAY TIME MULT, set the pulse to coincide
with one of the vertical graduation lines and record the
dial setting at this point.
5. Again using the DELAY TIME MULT, adjust the second
pulse in the same manner to the vertical line used in step
4, recording this dial setting as well. The pulse repetition
time is the second dial reading minus the first dial
reading multiplied by the A SWEEP TIME/DIV control
setting.
Using the formula:
Pulse
repetition
time= (2nd
reading) x Delayed sweep time (A SWEEP TIME/DIV set-
ting)
Read the dial setting w h e n B s w e e p points of
D E L A Y T I M E M U L T © and © are in the same
position.
Fig. 36
[EXAMPLE]
For the example, the first dial reading is 0.76 and the se-
cond is 6.22 with the A SWEEP TIME/DIV set at 2 us.
We have, substituting the appropriate values. (See Fig. 36)
Pulse repetition time = ( 6 . 2 2 - 0 . 7 6 ) x 2 (/*s) = 10.92 us
dial
reading — 1 st
dial
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