Keysight DSOX3012T, Руководство пользователя

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Horizontal Controls
2
Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide 65
You can also make this adjustment using the touchscreen. See “Access the
Horizontal Menu and Open the Scale/Delay Dialog" on page 56.
Notice how the time/div information in the status line changes.
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 66.
Note that the horizontal scale knob has a different purpose in the Zoom display.
See “To display the zoomed time base" on page 71.
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.
You can also make this adjustment using the touchscreen. See “Flick or Drag to
Scale, Position, and Change Offset" on page 47 and “Access the Horizontal
Menu and Open the Scale/Delay Dialog" on page 56.
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.