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Analog frequency meter

Discussion in 'Power Electronics' started by colum, Oct 23, 2020.

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  1. colum

    colum

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    Jul 25, 2013
    Hi bertus. One more question. When I send these photos do I forward them to your original response or to the last photo (mine) uploaded. I just want to make sure you see them, I'll need some advice.
    One of the contact meters have a Hz scale in the 20s is this an old RR scale..Thanks...colum
     
  2. bertus

    bertus Moderator

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    Nov 8, 2019
  3. colum

    colum

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    Jul 25, 2013
    Thanks for the excellent articles on meters.
    As suggested before the non electrical physical contact meters could register vibrations in bad bearrings etc
    I am going to see if it works on AC and DC motors and if so then its the rotating armature and if its only the AC then I assume its the electrical field.. I assume many things mostly incorrectly... Thanks...colum
     
  4. bertus

    bertus Moderator

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    Nov 8, 2019
    Hello,

    There will be analog vibration meters without the electical excitation.
    The mechanical movement of the vibration of the to be measured object must be able to reach the reeds to show the frequency.

    Bertus
     
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  5. poor mystic

    poor mystic

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    Apr 8, 2011
    Ohh those are for getting a generator to run at the right speed. They're a bit like a mechanical tuning fork.
     
  6. colum

    colum

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    Jul 25, 2013
    Hi poor mystic. The tuning fork analogy is interesting so in that case the signal is transmitted to the motor body by the rotating rotor and the vibrations of the heavy rotor is sensed by the meter.
    I wonder what the official name of this meter is.
    I don't think I have a motor fast enough to do a test...Thanks...colum
     
  7. bertus

    bertus Moderator

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    Nov 8, 2019
    Hello,

    In the article I posted they call it a "Vibrating Reed Mechanical Resonance Type Frequency Meter".

    Bertus
     
  8. colum

    colum

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    Jul 25, 2013
    Hi Bertus. I may have missed it but it seemed that those meters were electrically powered where the contact only meter may have a different name that I could look up.
    Oddly I have a tuning fork that has electric coils on both forks no idea what it does....colum
     
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