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How does it work - inductive hour meter?

Discussion in 'General Electronics' started by TimR, Jul 9, 2003.

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  1. TimR

    TimR Guest

    Those inductive hour meters that you attach to your lawn mower by
    wrapping the wire around the spark plug cable - how do they work?

    Would they pick up other current? For example, could I use one on my
    air conditioner or refrigerator by wrapping around the power leads?
    Or do you need the high voltage of the spark?

    I found several manufacturers, like Redington, SenDEC, etc., but none
    explained the functioning.
  2. JeffM

    JeffM Guest

    Those inductive hour do they work?
    Inductive-pickup timing lights for car ignitions work similarly.
    It should be easier, hours-wise, with appliances (constant 60Hz).

    It's a current transformer.
    (Think: 1-winding primary, 1000-winding secondary for a 1:1000 ratio.)
    You terminate it into a resistor to develop voltage
    and count the zero-crossings with a digital circuit.
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