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  • Author Author: tariq.ahmad
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Workbench Wednesday 24: No-Contact Current Measurements

 

 

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
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  • 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 polarity of the magnet has been important to the experiment and I have always struggled to determine which pole is the North and which is the South. By experimenting with the DC current function on the clamp meter I was able to determine that the position of the magnet inside the clamp very quickly determines which end is the North and which is the South.  Here is a diagram of how the meter reacts to the position of the magnet.

     

     

    The strength of the magnet can also be gauged by how high the current reading is and magnets can be compared to one another.

     

    John

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  • 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 polarity of the magnet has been important to the experiment and I have always struggled to determine which pole is the North and which is the South. By experimenting with the DC current function on the clamp meter I was able to determine that the position of the magnet inside the clamp very quickly determines which end is the North and which is the South.  Here is a diagram of how the meter reacts to the position of the magnet.

     

     

    The strength of the magnet can also be gauged by how high the current reading is and magnets can be compared to one another.

     

    John

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