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From: rmrin@inuxh.UUCP
Newsgroups: sci.electronics,misc.consumers
Subject: Re: info on clocks using battery backups
Message-ID: <585@inuxh.UUCP>
Date: Fri, 19-Jun-87 15:56:08 EDT
Article-I.D.: inuxh.585
Posted: Fri Jun 19 15:56:08 1987
Date-Received: Sun, 21-Jun-87 03:37:05 EDT
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Organization: AT&T Consumer Products, Indianapolis
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Xref: utgpu sci.electronics:733 misc.consumers:1786

> 
> How do the clocks (and clock radios) that run on main power (110/60 Hz)
> count the time ? Especially those that use battery backups. In this case
> do they use a quartz crystal ? Does that mean that these can be used
> on 110/50 Hz or any other frequency ? Any info will be appreciated.
> 
The ones I am familiar with count the cycles of the power line.  When
they go into the backup mode an internal oscillator takes over which
can be quite inaccurate.  One of mine loses a couple of minutes an
hour in the backup mode.  I would suggest checking them after a fairly
long power failure.