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Section 4 - Waveform Mode

VM700A Option 01 (NTSC) & Option 11 (PAL) User Manual

4-13

0% points. When the sync edge is now moved past the cursors, the % point

readout is calibrated, and indicates the sync edge % point that intersects the

cursors.

NOTE. If the waveform point that the amplitude reference marker is attached to is

moved off the display, the amplitude reference marker does not remain attached

to the waveform. Instead, it locks to the vertical scale at the point where the

waveform left the display.

So if the level of the signal at the point where the amplitude reference marker

was formerly anchored (which is now off screen) changes, the amplitude

reference marker will not track that change. It may sometimes be necessary to

decrease the horizontal expansion to keep both amplitude reference markers on

the display when trying to find a stable point on live video to anchor them.

Position the sync edge under the cursors so the % point readout is 90% and

select the Lock Left soft key. This locks the left cursor to the 90% point of the

sync edge. Now when you move the sync edge horizontally the left cursor moves

with it. Notice that the left cursor is a solid vertical line, and the right cursor,

which is still centered in the display, is a dashed line. Now simply move the

waveform so the % point readout indicates 10%. The Time from L to R readout

now indicates the rise time of the leading edge of sync. Figure 4-3 illustrates the

right cursor sitting at the 10% point and the left cursor locked to the 90% point

of the sync edge.

Note that touching either the Center Left or Center Right soft key will move

the corresponding cursor to the center of the display.

From this point, to measure sync width from the leading edge 90% point (10%

down from blanking) to the trailing edge 90% point (10% down from blanking),

you will need to locate the 90% point on the trailing edge by repeating the above

procedure. First, move the waveform to the left until the trailing edge of sync is

in the center of the screen. Next touch the Center Right soft key. Move the

waveform to the left and right to position the amplitude reference markers on the

100% point and 0% point of sync. Position the trailing sync edge so the % point

readout indicates 90%. The Time from L to R: readout now indicates sync width

from the 10% point of the leading edge of sync to the 10% point on the trailing

sync edge.

Tektronix VM700A User Manual

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