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Problem with frequency meter

  1. Mar 13, 2006 #1
    In quantum mechanics lab our frequency meter shows ~50 Hz when it is plugged in to a device which is not turned on. Is this a problem or an effect that I don't know? :rolleyes:
  2. jcsd
  3. Mar 13, 2006 #2

    Claude Bile

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    Science Advisor

    It is probably detecting the mains frequency, which is usually 50 Hz. Many frequency detection devices have 50 Hz and 100 Hz narrowband band-stop filters built into them for this reason.

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