Agilent Technologies 24A, 54621D, 42A, 54621A, 22A, 41A manual To setup the Horizontal time base

MegaZoom Concepts and Oscilloscope Operation

To setup the Horizontal time base

6Turn 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 ∝ s. 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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