jizzer Posted July 31, 2006 Posted July 31, 2006 Hi, The american dynamics dvr I am using is losing its time setting by about 5 minutes a day?? Could it be the button cell on the motherboard ,like on a pc , or could there be another reason?
Guest Posted July 31, 2006 Posted July 31, 2006 Just backed 3 16 channel ones with defective motherboards, suggest you give them a call with its batch number.
Service Engineer Posted July 31, 2006 Posted July 31, 2006 Could it be an actual American version thus expecting a 60Hz mains supply, instead of our 50Hz supply..? That would explain the Time losses.? ........................................................ Dave Partridge (Romec Service Engineer)
Guest Posted July 31, 2006 Posted July 31, 2006 Possibly, my probs wer with DM ones , pulls foot out of mouth and limps off.
Guest Posted July 31, 2006 Posted July 31, 2006 Yep, other resons might be an unstable AC source, its not on a building site running a genny is it?? Dont forget cheaper units may suffer from ambient temperature variations affecting the clock speed - is it in an airing cupboard or something?? Just a few ideas.
Guest Posted July 31, 2006 Posted July 31, 2006 Could it be an actual American version thus expecting a 60Hz mains supply, instead of our 50Hz supply..? That would explain the Time losses.? it would run 0,8333... seconds in a second so 72000 seconds in a day --> 1200 minutes --> 20hrs
jizzer Posted July 31, 2006 Author Posted July 31, 2006 it would run 0,8333... seconds in a second so 72000 seconds in a day --> 1200 minutes --> 20hrs No its not running at 60Hz its a uk spec machine 230V 50Hz on a domestic single phase supply...it is mounted in the loft so it is quite warm but I have also been bench testing it on the computer table and also noticed the time loss. Is the button cell on the motherboard nothing to do with the time accuracy????
Service Engineer Posted July 31, 2006 Posted July 31, 2006 Is the button cell on the motherboard nothing to do with the time accuracy????Nope, it's a backup battery for the bios.No its not running at 60Hz its a uk spec machine 230V 50Hz on a domestic single phase supplyI know that, but was wondering if the innards (PCB) could have been the US version mistakenly put in a UK shell . ........................................................ Dave Partridge (Romec Service Engineer)
SystemQ Posted August 1, 2006 Posted August 1, 2006 Dont forget cheaper units may suffer from ambient temperature variations affecting the clock speed - is it in an airing cupboard or something?? Just a snippet of info. A lot of electronic devices still use a timer based around the crystal technology of the early digital wristwatch. The whole timing is derived from the frequency at which the crystal oscillates, and this frequency is effected (slightly) by the temperature of the crystal. The wristwatch makers knew that whilst the watch was being worn the internal crystal would be at a pretty stable temperature around 34C do to the human bodies accurate temperature regulation. (skin is around 32-35C) Stick this same crystal timer in a device that can be subject to a wide fluctuations in temperature in winter/summer and you get corresponding irregular time keeping. Paul. System Q Ltd.
Matt the Teckie Posted August 1, 2006 Posted August 1, 2006 Early Intellex' were prone to time keeping issues. I'd get onto Tyco Tech, they can be reached if you call //.National Installer.// HQ in Sunbury. One thing you might want to try first is checking that the BIOS clock and the Windows clock are running in sync. The BIOS password used to be xellet. Hope this helps
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