Keysight Technologies DSO-X 2002A, Руководство пользователя

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Horizontal Controls
2
Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide 51
The ∇ symbol at the top of the display indicates the time reference point.
The horizontal scale knob works (in the Normal time mode) while acquisitions are
running or when they are stopped. When running, adjusting the horizontal scale
knob changes the sample rate. When stopped, adjusting the horizontal scale knob
lets you zoom into acquired data. See “Panning and Zooming Single or Stopped
Acquisitions" on page 52.
Note that the horizontal scale knob has a different purpose in the Zoom display.
See “To display the zoomed time base" on page 56.
To adjust the horizontal delay (position)
1 Turn the horizontal delay (position) knob ( ).
The trigger point moves horizontally, pausing at 0.00 s (mimicking a
mechanical detent), and the delay value is displayed in the status line.
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
display grid.
Figure 2 shows the trigger point with the delay time set to 200 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.
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.
The horizontal position knob works (in the Normal time mode) while acquisitions
are running or when they are stopped. When running, adjusting the horizontal
scale knob changes the sample rate. When stopped, adjusting the horizontal scale
knob lets you zoom into acquired data. See “Panning and Zooming Single or
Stopped Acquisitions" on page 52.