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To: Robert Salasidis who wrote (146176)10/28/2001 7:07:35 PM
From: John Walliker  Read Replies (1) of 186894
 
Robert,

Some computer motherboards have grossly inaccurate clocks - much worse than can be explained by temperature variations. I have seen many cases where the pcb has a component footprint for a trimming capacitor which has not been fitted (undoubtedly for cost reasons).

... has a clock chip that will change the oscillator frequency depending on the chip temperature...

Surely you mean a chip that keeps the oscillator frequency constant?

Even an expensive clock oscillator will eventually drift. This is why it makes sense to use a network time server which will guarantee accuracy to better than 1 second so long as the computer is connected to the Internet regularly.

Using GPS is very reliable, but needs an antenna which can see a reasonable part of the sky. It also takes up a serial port. Basic GPS receiver modules are now very inexpensive.

John
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