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What is supposed to do "Save on delta" function of an oscilloscope?

Discussion in 'General Electronics Chat' started by J_Nichols, Aug 10, 2018 at 12:03 AM.

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  1. J_Nichols

    J_Nichols Member

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    Some days ago I read about a function that some or all oscilloscopes have that is called "Save on delta". I have been searching on Google but I cannot find much information about it.

    What is supposed to do this functionality?
    Do all oscilloscopes have it?
     
  2. rjenkinsgb

    rjenkinsgb Active Member

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    I've never seen it, at least by that name.

    I suspect it's an alternative name for a one-shot trigger, that freezes the display once the trigger event is detected.
    "Delta" is commonly used to mean rate-of-change, so it may be slope detection rather than just level detection triggering.
     
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  3. cowboybob

    cowboybob Well-Known Member Most Helpful Member

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    Took a while to find this:

    A “save-on-delta” type of test compares
    the actual waveform against a high and
    low limit
    . The limits are set as toler-
    ances compared to a reference wave-
    form. If the acquired data passes out-
    side the limits, the digitizer can take an
    action (beep, GPIB SRQ, etc.).

    From Page 15 of this publication. (My emphasis)

    As for this:
    Yes, in a manner of speaking, but not with that name.

    Most scopes can be programmed (or adjusted) to trigger a "scan" when a waveform being tested reaches, for example, a pre-set voltage level (a "high or low limit").
     
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