Leader LBO-516 Instruction Manual - page 27
If the points between which the time difference exists are less
than 1 major division apart and located in the middle of complex
waveforms that are otherwise in phase, use the delayed (B)
timebase as described in
2-3-9 Delayed Timbase Operation to
select and expand that section of the complex waveform. After
doing that, follow the same technique as described in the
preceding paragraph. As an alternative, pull the A VARIABLE
(X10 MAG) control to expand the traces, and reposition the
section with the time difference on screen with the horizontal
POSITION controls.
If the points between which the time difference exists are
more than 1 but less than 5 major divisions apart, the High-
Accuracy Technique described next will yield the greatest
accuracy.
High-accuracy Techniques. Closely spaced points within a
complex waveform can be measured using the DLY TIME MULT
control. The linearity error of this control is only a fraction of a
percent, far less than the error possible over a small portion of the
timebase sweep.
The delay-time technique can be used with single-trace time
measurements (pulse width, period, etc.) or dual-trace
measurements (lead and lag time). The technique, after the trace
or traces are set up according to the desired procedure, is as
follows:
1. Set the B TIME/DIV switch (25) to a position 50 to 100
times (5 to 6 positions) faster than the A TIME/DIV switch
setting.
2. Press the INTEN BY B HORIZ DISPLAY pushbutton (31),
then position the intensified area over the first measurement
point by means of the DLY TIME MULT control (28).
3. Press the B HORIZ DISPLAY pushbutton (31) and carefully
adjust the DLY TIME MULT control to position the first
measurement point exactly over the central vertical graticule
line. Record the DLY TIME MULT dial reading.
4. Rotate the DLY TIME MULT control to position the second
measurement point over the central vertical graticule line.
Record the DLY TIME MULT dial reading.
5. Subtract the Step 3 reading from the Step 4 reading. For
example, if the DLY TIME MULT control setting was 4.86
in Step 3, and 7.38 in Step 4, the difference is 2.51.
6. Multiply the Step 5 number by the A TIME/DIV switch
setting to find the time difference.
2.4-4 Phase Difference Measurements
Phase difference or phase angle between two signals can be
measured using the dual trace feature of the oscilloscope or by
operating the oscilloscope in the X-Y mode. When
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