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How does it work - inductive hour meter?

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

  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 meters...how 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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