G-Shock accuracy and body temperature.
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  1. #1
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    G-Shock accuracy and body temperature.

    Every G-Shock or Casio watch I own runs fast (at room temperature 70 degrees). Some run fast a few seconds a month or more. I've never owned one that runs slow. I'm pretty sure ambient temperature effects how accurately quartz movements operate/keep time. I thought maybe they set them fast because when you wear the watch against your wrist, it heats up the watch, slowing the quartz movement, so setting them to run fast might compensate for the slight slowdown when worn. Does wearing a watch in warm/hot temperature slow or make the watch faster? Vice versa, does wearing the watch in cold temperature, slow the watch or speed it up? Just want to know what people's thoughts are on the matter.

  2. #2
    Member bgomez's Avatar
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    Re: G-Shock accuracy and body temperature.

    Quote Originally Posted by polod View Post
    Every G-Shock or Casio watch I own runs fast (at room temperature 70 degrees). Some run fast a few seconds a month or more. I've never owned one that runs slow. I'm pretty sure ambient temperature effects how accurately quartz movements operate/keep time. I thought maybe they set them fast because when you wear the watch against your wrist, it heats up the watch, slowing the quartz movement, so setting them to run fast might compensate for the slight slowdown when worn. Does wearing a watch in warm/hot temperature slow or make the watch faster? Vice versa, does wearing the watch in cold temperature, slow the watch or speed it up? Just want to know what people's thoughts are on the matter.

    Hmm... I know it happens with some automatics, but i don't know if the same thing applies to digital quartz Gs too. I think some members will be able to shed light on this.
    I am worth more than any item in my watch box.

  3. #3
    Member ron281969's Avatar
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    Re: G-Shock accuracy and body temperature.

    no but if you got an atomic that it would set right time every night and when i was riding my scooter in early 90's that i was wearing dw-6100 and ts-100 and they read with thermometer and it was cold doing it and really it was around 30 to 40f in winter at night but the watches saying like 14f cause the speed i was riding and summer time in day time it would sometimes go over 100f but really in 80f to 90f.
    Current watch collection is dw-001, dw-002(2), dw-003(2), dw-004(2), dw-5000(13)(dw-5000c-1a(3), dw-5000-1jf, dw-5000sl(3), dw-5000bl2, dw-5025d-8(2), dw-5025b-7(2), dw-50301jr, dw-5030c-1jr, ww-5100c-1, dw-5200(9), dw-5200c-1(8), dw-5200c-9, ww-5300c-1(2), dw-5300(5), dw-5300-1av, dw-5300-1bv(3), dw-5300g-9v, dw-5400(6), dw-5400c-1(4), dw-5400c-9(2), dw-5500, dw5600c(3), dw-5600c-1v(691), dw-5600c-1v(901), dw-5600c-9bv(691), dw-5600e, dw-5700(5), dw-5700c-1v(3), dw-5700c-9v, dw-5700c-9gv(2), dw-5800(2), dw-6100, dw-6600(3), dw-6800, dw-8400, dw-8600(2), dw-8800, dw-9052, dw-9100, dw-9400(2), dw-9500(3), mtg-900, g-100, g-9100, glx-5600, gw-5600j-1, gw-610, gw-300, gw-701d, gw-m5600-1(2) of casio g-shocks and pre g-shock dw-1000(2) and pre g-shock dw-1500 and dw-210(6) and dw-240(2) and dw-260(5) and dw-270(2) and dw-290(2) and few timex ironman and thermometer of timex.

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  5. #4
    Member smittythepig's Avatar
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    Re: G-Shock accuracy and body temperature.

    Quote Originally Posted by polod View Post
    Every G-Shock or Casio watch I own runs fast (at room temperature 70 degrees). Some run fast a few seconds a month or more. I've never owned one that runs slow. I'm pretty sure ambient temperature effects how accurately quartz movements operate/keep time. I thought maybe they set them fast because when you wear the watch against your wrist, it heats up the watch, slowing the quartz movement, so setting them to run fast might compensate for the slight slowdown when worn. Does wearing a watch in warm/hot temperature slow or make the watch faster? Vice versa, does wearing the watch in cold temperature, slow the watch or speed it up? Just want to know what people's thoughts are on the matter.
    yes, quartz watches are definitely affected by temperature, which is why high-end quartz watches often use thermo-compensated movements.

  6. #5
    Member Vintage's Avatar
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    Re: G-Shock accuracy and body temperature.

    Quote Originally Posted by smittythepig View Post
    yes, quartz watches are definitely affected by temperature, which is why high-end quartz watches often use thermo-compensated movements.
    Indeed. I've seen the rate in mine change depending on the season of the year.

  7. #6
    Member Joakim Agren's Avatar
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    Cool Re: G-Shock accuracy and body temperature.

    The quartz crystal swings faster making the watch go faster the hotter it is so actually the watch will be faster on wrist then in ambient room temperature. If you put it in the fridge it will go slower. The official +-15 sec specification by Casio is in 25 degree Centigrade temp.

  8. #7
    Member tribe125's Avatar
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    Re: G-Shock accuracy and body temperature.

    If you're interested in thermo-compensated watches, take a look at the HEQ forum on WUS. There are some very knowledgeable people on that forum.
    I used to list my watches here until I realised it ruined people's Google searches...

  9. #8
    HAQ and AW moderator
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    Re: G-Shock accuracy and body temperature.

    Usually the crystals are optimize for body temperature. Hotter or colder will change the rate away from optimal.

  10. #9

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    G-Shock

    temp is not a problem for the unit unless it exceeds 40c

  11. #10
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    Re: G-Shock accuracy and body temperature.

    It depends on what accuracy you want to maintain.

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