Reference
Trigger marker
and horizontal expansion point
Waveform record icon
The small inverted triangle is the horizontal expansion point. When you change
the horizontal Scale setting, the waveforms contract or expand about this point.
When delay is off, the horizontal expansion point is the same as the trigger point.
Delay Button
Push the Delay button when you want to delay the acquisition relative to the
trigger event. Turn the horizontal Position control counterclockwise to increase
the delay; the trigger point moves to the left and ultimately outside of the acquired
wavefor
m. Then, you can adjust the horizontal Scale to acquire more detail
around the area of interest (center of the screen).
When de
lay is on, the trigger point separates from the horizontal expansion point.
The h orizontal expansion point stays at the center of the screen. The trigger point
can move off the screen; when this happens, the trigger marker turns to point in
the direction of the trigger point.
Use the delay feature when you want to acquire waveform detail that is separated
from the trigger event by a significant interval of time. For example, you can
tr
igger on a sync pulse that occurs once every 10 ms and then look at high-speed
signal characteristics that occur 6 ms after the sync pulse.
I
n the next screen example, the trigger markers show that the trigger point is
before the acquired waveform. The delay time, shown in the readout, is the time
from the trigger point to the expansion point (center screen).
68 TDS3000C Series Oscilloscope User Manual
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