Elenco 30MHz Dual Trace - Manual (Page 56)

53
APPLICATION
PULSE WIDTH MEASUREMENTS
(Refer to Fig.12)
1. Apply the pulse signal to the input jack and set the CH 1/CH 2 switch to the
channel to be used.
2. Use the VOLTS/DIV and VARIABLE controls to adjust the display so the
waveform is easily observed. Use the POSITION control to position the pulse over
the center horizontal graduation.
3. Measure the distance between the leading edge and trailing edge of the pulse
(along the center horizontal graduation line). Be sure that the VAR SWEEP
control is set to CAL. Multiply the number of horizontal divisions by the sweep
TIME/DIV, and if X10 magnification is used, further multiply this value by 1/10.
The measurement is summarized by the following equation:
Pulse Width = Hor div x TIME/DIV
(X 1/10 if X10 is used)
For the example shown in Fig.12, the pulse width at the center of the pulse is 4.6
divisions. If the sweep TIME/DIV is 0.2 ms and X10 magnification is used, the
pulse width is calculated as follows:
100
90
10
0
Fig.12 Pulse Width Measurement
Pulse Length
(at 50%)
Adjust to the vertical scale with POSITION
Align the waveform
with the center
using POSITION