4-13
MegaZoom Concepts and Oscilloscope Operation
To setup the Horizontal time base
6 Turn the delay knob ( ) and notice that its value is displayed in the
status line.
Changing the delay time moves the sweep horizontally and indicates how far
the trigger point (
▼) is from the time reference point (∇). These reference
points are indicated along the top of the graticule. The previous figure shows
the trigger point with the delay time set to 1.00 µs. The delay time number tells
you how far the time reference point ∇ is located from the trigger point
▼. When
delay time is set to zero, the delay time indicator overlays the time reference
indicator.
All events displayed left of the trigger point (
▼) happened before the trigger
occurred, and these events are called pre-trigger information. You will find this
feature very useful because you can now see the events that led up to the trigger
point. Everything to the right of the trigger point (
▼) is called post-trigger
information. The amount of delay range (pre-trigger and post-trigger
information) available depends on the sweep speed selected. This range is
much larger than that on an oscilloscope without deep memory.
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