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Old 01-23-2018, 06:29 AM
 
Location: North Central Florida
6,218 posts, read 7,282,612 times
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Wondering if anyone else experienced same or similar.

I have one of those atomic alarm clocks, kept on my nightstand. For years it has always kept remarkably accurate time.

I'm in Florida, eastern time zone. I woke with the atomic clock stating it was 8:48 pm on Wednesday January 8, making me think I was seriously late, (almost two years worth) while my Samsung android and other clocks were reporting 5:07 am. (15hrs, 31 min discrepancy, forward)

Did anyone else see similar today? The 7.9 quake off Alaska a possible cause? As of this post the atomic clock is still reporting 11:59 pm in the eastern time zone on Wednesday January 8.


CN
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Old 01-23-2018, 09:37 AM
 
Location: Pacific 🌉 °N, 🌄°W
11,757 posts, read 6,534,742 times
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It sounds like a signal reception problem. I would check the manufacturer's user guide to see if there is a FAQ section and a trouble shooting guide section.

You might also want to review NIST's publication "WWVB Radio Controlled Clocks: Recommended Practices for Manufacturers and Consumers"
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Old 01-23-2018, 11:04 AM
 
16,833 posts, read 16,568,206 times
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Quote:
Originally Posted by Compression View Post
Wondering if anyone else experienced same or similar.

I have one of those atomic alarm clocks, kept on my nightstand. For years it has always kept remarkably accurate time.

I'm in Florida, eastern time zone. I woke with the atomic clock stating it was 8:48 pm on Wednesday January 8, making me think I was seriously late, (almost two years worth) while my Samsung android and other clocks were reporting 5:07 am. (15hrs, 31 min discrepancy, forward)

Did anyone else see similar today? The 7.9 quake off Alaska a possible cause? As of this post the atomic clock is still reporting 11:59 pm in the eastern time zone on Wednesday January 8.


CN
Not going to be due to the quake. Likely a hardware problem.
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Old 01-24-2018, 03:50 PM
 
292 posts, read 501,675 times
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Quote:
Originally Posted by lkb0714 View Post
Not going to be due to the quake. Likely a hardware problem.

There is a long wave receiver built into the clock that gets the data signal from WWVB and long wave
is easily susceptible to interference. A check of Wikipedia did not mention any error detection/correction,
so maybe the data is being corrupted?
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Old 01-24-2018, 04:21 PM
 
28,782 posts, read 45,028,866 times
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The Flash ran past your house.

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Old 01-24-2018, 04:43 PM
 
Location: Tricity
52,344 posts, read 74,063,603 times
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Most likely a hardware or signal problem.
I have two atomic wall clocks - same brand, same age, the batteries changed at the same time. The one shows an accurate time, the other is 2 minutes late. Always. No matter how many times I reset it.
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Old 01-24-2018, 07:18 PM
 
28,782 posts, read 45,028,866 times
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Quote:
Originally Posted by elnina View Post
Most likely a hardware or signal problem.
I have two atomic wall clocks - same brand, same age, the batteries changed at the same time. The one shows an accurate time, the other is 2 minutes late. Always. No matter how many times I reset it.

Swap locations. See what happens...
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Old 01-24-2018, 07:20 PM
 
Location: Tricity
52,344 posts, read 74,063,603 times
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Did that too... but the slow clock is slow everywhere in the house...
Two minutes, no more, no less.
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Old 01-24-2018, 09:44 PM
 
28,782 posts, read 45,028,866 times
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Has Doctor Who been to visit?
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Old 02-01-2018, 02:16 PM
 
Location: Brooklyn, New York
4,971 posts, read 4,992,514 times
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Remember that consumer "atomic clocks" are a marketing gimmick, they are actually radio clocks, and can have all kinds of errors.

As far as I know, real atomic clocks (ones that measure energy transition levels in atoms to tell time) are not even available to consumers and are very expensive to build. I don't think anyone even has atomic clocks besides scientific labs, universities, and defense departments. Real atomic clocks have small time errors once every X millions of years...
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