Horizontal Controls 2
Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide 47
As you adjust the horizontal scale, notice how the time/div information in the
Horizontal badge changes.
The ∇ symbol at the top of the waveform grid indicates the time reference point.
You can adjust the horizontal scale (in the Normal time mode) while acquisitions
are running or when they are stopped. When running, adjusting the horizontal
scale can change the sample rate and memory depth. When stopped, adjusting
the horizontal scale lets you zoom into acquired data. See
"Panning and Zooming
Single or Stopped Acquisitions" on page 48.
To adjust the horizontal delay (position)
You can adjust the horizontal delay in these ways:
• Turn the horizontal delay (position) knob ( ).
Note that the horizontal position knob has a different purpose in the Zoom
display. See "To display the zoomed time base" on page 48.
• In the Drag Waveforms mode (see "Select Draw Box or Drag Waveforms
Mode"
on page 40), drag waveforms left or right.
• Use the Main Delay controls in the Horizontal dialog box (that you can open by
selecting the Horizontal badge or by choosing Setup > Horizontal... from the main
menu).
Changing the delay time moves the trigger point (solid inverted triangle)
horizontally and indicates how far it is from the time reference point (hollow
inverted triangle ∇). These reference points are indicated along the top of the
waveform grid. The trigger point pauses at 0.00 s, mimicking a mechanical detent.
The delay value is displayed in the Horizontal badge.
The delay time value 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.
These events are called pre-trigger information, and they show 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 time/div selected and memory depth.
When acquisitions are running (in the Normal time mode), adjusting the horizontal
position changes the amount of pre-trigger and post-trigger data. When stopped,
adjusting the horizontal position pans through the last-acquired data. See
"Panning and Zooming Single or Stopped Acquisitions" on page 48.
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