Initial Setup 2
InfiniiVision Oscilloscopes User’s Guide 65
3 Press the Fine softkey to turn on the time base fine adjustment.
The Fine softkey lets you change the sweep speed in smaller increments with the
time/division knob. The sweep speed remains fully calibrated when Fine is on. The
value is displayed in the status line at the top of the display.
When Fine is turned off, the Horizontal sweep speed knob changes the time base
sweep speed in a 1-2-5 step sequence.
4 Note the setting of the Time Ref (time reference) softkey.
Time reference is the reference point on the display for delay time (horizontal
position). The time reference can be set to one major division from the left or right
edge, or to the center of the display.
A small hollow triangle (
 at the top of the display grid marks the position of the time
reference. When delay time is set to zero, the trigger point indicator () overlays the
time reference indicator.
Turning the Horizontal sweep speed knob will expand or contract the waveform about
the time reference point (). Turning the Horizontal position ( ) knob in Normal
mode will move the trigger point indicator () to the left or right of the time reference
point ().
The time reference position sets the initial position of the trigger event within
acquisition memory and on the display, with delay set to 0. The delay setting sets the
specific location of the trigger event with respect to the time reference position. The
time reference setting affects the Zoom sweep as described in the following ways:
• When the horizontal mode is set to Normal, the delay knob positions the normal
sweep relative to the trigger. This delay is a fixed number. Changing this delay value
does not affect the sweep speed.
• When the horizontal mode is set to Zoom, the delay knob controls the position of
the zoom sweep window inside the normal sweep display. This delay value is
independent of sampling interval and sweep speed. Changing this delay value does
not effect the position of the normal window.
5 Turn the delay knob ( ) and notice that its value is displayed in the status line.
The delay knob moves the normal sweep horizontally, and it pauses at 0.00 s,
mimicking a mechanical detent. Changing the delay time moves the sweep
horizontally and indicates how far the trigger point (solid inverted triangle) is from the
time reference point (hollow inverted triangle ). These reference points are indicated
along the top of the display grid. The previous figure shows the trigger point with the
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