Results 1 to 3 of 3

Thread: Odd question about A/C digital clocks

  1. #1
    Join Date
    Nov 2007
    Location
    Richmond VA
    Posts
    1,581
    Thanks Thanks Given 
    18
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default Odd question about A/C digital clocks

    DO A/C digital clocks at all depend on current frequency to keep time?

    I have a Sony Dream Machine alarm clock that keeps perfectly normal time when hooked up to the mains.

    I have had no power for the past 75 hours now due to Irene, but I have the clock hooked up to a generator and it seems to be going much faster.

    In an 8 hour night it was 6 minutes faster than my battery clocks and watch.

    I reset the time last night at 11:20PM and now at 7:11PM today it is saying 7:26 PM, so over 20 hours it has gone forward 15 minutes.

    The only thing I can think of is that perhaps the generator's frequency is not the normal 60hz of US power.
    "There is no way you can be Harvard Monday through Friday, and try to be Alabama on Saturday" -Art Guepe former University of Virginia head football coach

  2. #2
    Join Date
    Feb 2009
    Posts
    1,089
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    some clocks do that, its weird. and yeah i agree with the 60hz variation causing oscillator to go bad. sorry no hard info but i've had that issues from imported digital clocks.

  3. #3
    Join Date
    Jun 2009
    Location
    Montreal, Canada
    Posts
    1,734
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    It wouldn't make a lot of sense to me if it did use the mains frequency as a reference. It's not like the frequency is always going to be constant. Even small variations would be a big deal for timekeeping accuracy.
    Main: i5 2500K@4.6GHz w/Zalman CNPS10X Performa, Intel DZ68BC, 8GB G.Skill DDR3-1600, PNY GTX 470 + EVGA GTX 470, ASUS Xonar DX, ADATA S510 120GB, Samsung 1TB F3+1TB F1+2TB F4, Kingwin LZG 1kW, Lian-Li PC-9F, Dell U2212HM+S2209W, Win7 Professional.
    Laptop: Dell Vostro 3450, i5 2410M, 8GB DDR3-1333, AMD Radeon HD 6630M 1GB, Intel X25-M 80GB, Seagate Momentus 750GB, Win7 Home Premium.

Similar Threads

  1. Digital Ocean
    By Jon Gerow in forum Site Suggestions & Forum Issues
    Replies: 1
    Last Post: 01-06-2018, 08:46 PM
  2. Replies: 1
    Last Post: 08-31-2016, 08:18 PM
  3. Digital PWM?
    By Killy in forum General PC Hardware
    Replies: 1
    Last Post: 04-18-2008, 09:01 PM
  4. digital electronic troubleshooting
    By dannydavis in forum Electronic Component Discussion
    Replies: 2
    Last Post: 04-02-2008, 10:07 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •