2 Initial Setup
66 InfiniiVision Oscilloscopes User’s Guide
delay time set to 400 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 and memory depth.
Zoom mode
Zoom, formerly called Delayed sweep mode, is a horizontally expanded version of normal
display. When Zoom is selected, the display divides in half and the Zoom mode icon is
displayed in the middle of the line at the top of the display. The top half of the display
shows the normal sweep and the bottom half displays the Zoom sweep.
The Zoom window is a magnified portion of the normal sweep. You can use Zoom to
locate and horizontally expand part of the normal sweep for a more detailed
(higher-resolution) analysis of signals.
The following steps show you how to use Zoom.
1 Connect a signal to the oscilloscope and obtain a stable display.
2 Press the [Menu/Zoom] key (or [Main/Delayed] key on some oscilloscopes).
3 Press the Zoom softkey.
To change the sweep speed for the Zoom window, turn the horizontal sweep speed
control knob. As you turn the knob, the sweep speed is highlighted in the status line
above the waveform display area.
The area of the normal display that is expanded is outlined with a box and the rest of the
normal display is lightened. The box shows the portion of the normal sweep that is
expanded in the lower half. The Horizontal Sweep Speed controls the size of the box and
the Horizontal Position (delay time) control sets the left-to-right position of the zoom
sweep. The delay value, which is the time being displayed relative to the trigger point) is
momentarily displayed in the upper-right portion of the display when the delay time ( )
knob is turned. Negative delay values indicate you’re looking at a portion of the waveform
before the trigger event, and positive values indicate you’re looking at the waveform after
the trigger event.
To change the sweep speed for the normal sweep window, press the Normal softkey,
then turn the sweep speed knob.
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