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Power Box Hum

Discussion in 'Electronic Repair' started by J Ace, Feb 25, 2004.

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  1. J Ace

    J Ace Guest

    Hi there, dunno if this is the right forum, but here goes:

    I live in New Zealand and have recently bought a house. Problem is, the
    power meter is making a loud intermittent hum.

    I've checked the earthing, which appears to be fine, and I cant find any
    dodgy wiring to speak of. I have also removed all the loads from every power
    socket, and the noise is still there. It doesn't seem to be affected by
    weather conditions/humidity, and doesn't seem to occur when only the lights
    are running from the power box (ie, I switched off the mains rails at the
    power box). It's got me stumped.

    Perhaps should I be checking all the outlets, or do you think that it could
    just be a faulty power meter?

    Any ideas would be much appreciated.

    Cheers, Jono
     
  2. Won't the power company come and check if you ask? Around here, the power
    meter is often still electromechanical and there is a coil that is always
    energized. This may lead to vibration of something and doesn't mean anything.

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
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  3. Not quite. There is always excitation of the voltage coil in the meter
    so only disconnecting the input will be guaranteed to quiet it. :)

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
    contact me, please use the feedback form on the S.E.R FAQ Web sites.
     
  4. Jamie

    Jamie Guest

    your meter is most likely an electric coil system like most of those
    here in the USA. its possible the 50Hz (most likely) is causing some
    magneted vibrations..
    disconnecting your mains from this unit from with inside your home
    should stop it because there is no longer a load on the meter to cause
    it to turn. it this still keeps up i would suggest you better get some
    one out there and look at it.
     
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