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???
11/15/03 00:19
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 		 #58744 - RE: Crystal or mains timebase?
Responding to: ???'s previous message
"Why don't you just use the crystal for the timing BTW?"

That's a good question!

I understood that the long-term accuracy of mains frequency was actually extremely good -although it could vary a fair bit in the sort term.

Is this still true?

How does it compare to a bog-standard processor crystal?

Andy,

standard quartz oscillator shows about +-100ppm deviation. Sometimes a bit more. Over 24 hours this makes about +-10sec.

Mains frequency is synchronized with atomic clocks. So, theoretically deviation is zero. But at certain times a day mains net can be switched to different sources. Then, some 100msec can be lost...

Kai

List of 29 messages in thread
TopicAuthorDate
[OT} Cool clock project.            01/01/70 00:00      
   RE: [OT} Cool clock project.            01/01/70 00:00      
      RE: [OT} Cool clock project.            01/01/70 00:00      
   RE: [OT} Cool clock project.            01/01/70 00:00      
      RE: [OT} Cool clock project.            01/01/70 00:00      
   RE: [OT} Cool clock project.            01/01/70 00:00      
   RE: On Topic Clock Project.            01/01/70 00:00      
   RE: [OT} Cool clock project.            01/01/70 00:00      
      RE: [OT} Cool clock project.            01/01/70 00:00      
      RE: [OT} Cool clock project.            01/01/70 00:00      
         RE: [OT} Cool clock project.            01/01/70 00:00      
            RE: [OT} Cool clock project.            01/01/70 00:00      
               RE: 50/60 Hz Auto-detect            01/01/70 00:00      
         RE: Crystal or mains timebase?            01/01/70 00:00      
            RE: Crystal or mains timebase?            01/01/70 00:00      
               RE: Crystal or mains timebase?            01/01/70 00:00      
   RE: [OT} Cool clock project.            01/01/70 00:00      
   RE: [OT} Cool clock project.            01/01/70 00:00      
      RE: [OT} Cool clock project.            01/01/70 00:00      
   RE: [OT} Cool clock project.            01/01/70 00:00      
      RE: [OT} Cool clock project.            01/01/70 00:00      
         RE: [OT} Cool clock project.            01/01/70 00:00      
            RE: [OT} Cool clock project.            01/01/70 00:00      
               RE: [OT} Cool clock project.            01/01/70 00:00      
                  RE: [OT} Cool clock project.            01/01/70 00:00      
                     RE: [OT} Cool clock project.            01/01/70 00:00      
   RE: [OT} Cool clock project.            01/01/70 00:00      
   RE: [OT} Cool clock project.            01/01/70 00:00      
      RE: [OT} Cool clock project.            01/01/70 00:00      

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