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    Magnetic susceptibility of (mechanical) quartz watches
    From: Tony Oz
    Date: 2019 Aug 19, 01:18 -0700

    Hello!

    Recently I spent some time in efforts to set my electro-mechanical wrist watch (with 24-hours face and hour hand) to the time signal - making its' minutes hand to point to the exact minute mark when the seconds hand is at zero. (It in itself was rather difficult on a cheap caliber with large play in the gear train)

    Alas, it was all ruined yesterday by a carelessly put the watch on my SW receiver - near a dynamic with significant magnetic field around.

    The step motor in the wrist watch stalled...

    It resumed as soon as I took the watch off the receiver's cover.

    So this is yet another downside of electro-mechanical watches:

    • first is the possibility to inadvertently move the seconds hand by some acceleration (the step motor is not strong enough to keep position)
    • and now this unfortunate discovery

    Hope this helps someone.

    Warm regards,
    Tony

    60°N 30°E

       
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