Acquire the Signal
With Delay set to On,turntheHorizontal Position knob counterclockwise to increase the delay. The trigger point will move to the
left and ultimately outside of the acquired waveform. Then you can adjust the Horizontal Scale knob to acquire more detail around
the area of interest at the cente r of the screen.
When this delay is on, the trigger point separates from the horizontal expansion point. The horizontal expansion point stays at
the center of the screen. The trigger point can move off the screen. When this happens, the trigger marker tu rns to point in the
direction of the trigger point.
Use the delay fe ature when you want to acquire waveform detail that is separated from the trigger event by a significant interval of
time. For example, you can trigger on a sync pulse that occurs once every 10 ms and then look at high-speed signal characteristics
that occur 6 ms after the sync pulse.
When the delay feature is set to Off, the expansion point is tied to the trigger point so that scale changes are centered around the
trigger point.
Using Roll Mode
Roll mode gives a display similar to a strip cha rt recorder for low-frequency signals. Roll mode lets you see acquired data points
without waiting for the acquisition of a complete waveform record.
Roll mode is enabled when the trigger mode is auto and the horizontal scale is set to 40 ms/div or slowe r.
DPO3000 Series Oscilloscopes User Manua l 93
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