Low Amps Probe Discrepency?

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  • cbender
    Member
    • Feb 2011
    • 57

    Low Amps Probe Discrepency?

    Having issues with low amps probe(s) 2 probes, 2 different readings. Wondering if you must use a snap-on probe for accurate results? I have an otc probe, the shop has a snap-on probe, Which one is right?


    Both captures below are take from an 05 Trailblazer heater blower motor.
    First we have the OTC Low Amp Probe


    Now we have the Snap-On, I suspect you must do some type of conversion to get the correct amperage using the OTC?
  • Rich Shepherd
    Snap-on D&I
    • Nov 2006
    • 553

    #2
    If you scale up the OTC conversions, they match the SO probe.
    The measurements are off by a factor of 10 which is the difference between the high and low scales.
    Did you select the right range of the probe to match the selection on the Verdict?
    For the 1mv/100ma range on the OTC probe, select 40 amp.
    For the 1mv/10ma range, select 20.

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    • cbender
      Member
      • Feb 2011
      • 57

      #3
      Originally posted by Rich Shepherd
      If you scale up the OTC conversions, they match the SO probe.
      The measurements are off by a factor of 10 which is the difference between the high and low scales.
      Did you select the right range of the probe to match the selection on the Verdict?
      For the 1mv/100ma range on the OTC probe, select 40 amp.
      For the 1mv/10ma range, select 20.
      on the 1mv/100ma setting on the otc clamp it would not even give me a reading over 2 amps, thats what prompted me to try the SO clamp after using the SO clamp I realized that to get a reading off the otc clamp I had to set it to 1mv/10ma. This is where the confusion comes in!

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