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Pre-trigger and post-trigger acquisition for no dead time acquisition system

  • US 8,046,183 B2
  • Filed: 03/04/2008
  • Issued: 10/25/2011
  • Est. Priority Date: 03/04/2008
  • Status: Expired due to Fees
First Claim
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1. A no dead time acquisition system for use in a digital oscilloscope, comprising:

  • means for recognizing all trigger events within an electrical signal being monitored to produce a trigger signal;

    means for delaying a digitized signal representing the electrical signal, the delaying means including a buffer having a variable record length for delaying the digitized signal by an amount equal to a desired pre-trigger interval, the desired pre-trigger interval defining the variable record length, said variable length buffer being controllable to read out said delayed digitized signal from any point within said buffer;

    means for drawing a waveform for the digitized signal from the delaying means in real time in response to the trigger signal such that the waveform represents the electrical signal at the desired pre-trigger interval prior to a first trigger event within the trigger signal; and

    means for delaying the trigger signal by a desired post-trigger interval to produce a delayed trigger signal so that the drawing means, in response to the delayed trigger signal, produces the waveform that represents the electrical signal at the desired post-trigger interval after the first trigger event within the trigger signal.

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