Elenco 30MHz Dual Trace - Manual (Page 58)

55
APPLICATION
TIME DIFFERENCE MEASUREMENT
(Refer to Fig.14)
This procedure is useful in measurement of time difference between signals that are
synchronized to one another but skewed in time.
1. Apply the two signals to the CH1 and CH 2 input jacks and select the dual-trace
display mode (either the CHOP or ALT mode). CHOP is usually chosen for low
frequency signals.
2. Select the faster of the two signals as the trigger SOURCE and use the
VOLTS/DIV and sweep TIME/DIV controls to obtain and easily observed display.
3. Use the Y POSITION controls to superimpose both waveforms to intersect the
center horizontal graduation line as shown in Fig.14.
4. Use the X POSITION control to set the reference signal coincident with one of the
vertical graduation lines.
5. Measure the horizontal distance between the two signals and multiply this
distance (in divisions) by the sweep TIME/DIV setting. If X10 magnification is
used, multiply this again by 1/10.
The measurement is summarized by the following equation:
Time = Hor div x TIME/DIV (x 1/10 if X10 is used)
For the example shown in Fig.14, the horizontal distance measured is 4.4
divisions. If the sweep TIME/DIV is 0.2 ms and X10 magnification is not used, the
time difference is calculated as follows:
Time = 4.4 (div) x 0.2 (ms/div) = 0.88 ms or 880 μs
Fig.14
Time Difference Measurement
100
90
10
0
Time difference
Reference signal Comparison signal