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Current leakage

Discussion in 'Electronic Design' started by Andy K, Dec 9, 2013.

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  1. Andy K

    Andy K Guest

    I test a small alarm for current leakage with the switch in the OFF position.

    It showed a drain of 2 uA.

    Is that typical ?

    Thanks,
    Andy
     
  2. miso

    miso Guest

    You would have to open the device to see if the switch really
    disconnects the internal circuitry. It wouldn't surprise me if there was
    a large cap on the DC input before the switch.

    You also have to determine if the switch is even a switch in the literal
    sense of the word. To keep cost down, many switches are just a means to
    send a signal to the circuitry to wake up or not.
     
  3. Andy K

    Andy K Guest

    The caps are not labeled, so I suspect they are bottom of the barrel stuff. :)

    http://i1289.photobucket.com/albums/b516/drew77580/Alarm2_zpsb07c41ef.png

    http://i1289.photobucket.com/albums/b516/drew77580/Alarm1_zps4b8db9fa.png

    I saw a procedure for determining the Farads, but it looked rather involved.

    Andy
     
  4. Guest

    Where's it getting its power and how long was it on when you took the reading?
     
  5. Andy K

    Andy K Guest

    Power from 3 AA batteries

    5 Seconds before I took the reading.

    Andy
     
  6. Robert Baer

    Robert Baer Guest

    Maybe,maybe not; how was the test done? Schematic?
     
  7. Robert Baer

    Robert Baer Guest

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