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Documents No-Contact Current Measurements -- Workbench Wednesdays 24
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  • Author Author: Matt
  • Date Created: 28 May 2020 5:39 PM Date Created
  • Last Updated Last Updated: 3 Jun 2020 7:24 AM
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No-Contact Current Measurements -- Workbench Wednesdays 24

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No-Contact Current Measurements

element14 Presents  |  Bald Engineer: James Lewis' VCP Profile |  Workbench Wednesdays

 

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One of the safest ways to measure current is with a clamp. Clamps do not require you to break the circuit and they safely measure wires with thousands of amps. In this video, we measure DC current in the lab, AC current of a reflow oven controller, and the DC current in a car using a Tenma 72-722672-7226 True RMS Clamp Meter.

 

Bill of Material:

 

Product NameManufacturerQuantityBuy KitBuy Kit
72-722672-7226 - Clamp Meter, Auto, True RMS, 600 A AC, 600 V AC, 600 V DC, 28 mm Jaw Opening Max.Tenma1Buy NowBuy Now
  • current clamp
  • ac current
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Top Comments

  • baldengineer
    baldengineer over 6 years ago in reply to koudelad +3
    Hey David, for low currents, that is a good way to improve the overall measurement accuracy. I did not mention it in this video because I was focused on getting closer to the meter's maximum current. But…
  • jw0752
    jw0752 over 6 years ago +3
    Hi James, Your blog inspired me to run an experiment. I had in stock this current measuring board with a ACS712T ECL20 Chip on it. I cut a notch in a ferrite core that was just big enough to slip over…
  • jw0752
    jw0752 over 6 years ago +3
    Hi James, I purchased one of these meters from Newark and I have been quite happy with it. I have also found another use for it. Over the years my experiments have often involved magnets. Sometimes the…
  • koudelad
    koudelad over 6 years ago

    Good episode, James.

     

    I also remember from the university that there are cases when you want to create more turns of the measured wire around the clamps - you get a higher current reading, but also a sum of the errors of a single wire measurement. However it is impossible to keep the wires centered in the clamps this way.

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  • baldengineer
    baldengineer over 6 years ago in reply to DAB

    Thank you DAB.

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  • DAB
    DAB over 6 years ago

    Another good episode.

     

    Well done.

     

    DAB

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