The "catch 22" is that I want as many cycles as possible and an accurate
time stamp.

I think I have resolved the issue (thanks to you all). The device that I am
reading data from has its own clock and I am using that clock as my time
stamp and I will also use it every hour or so to reset the system clock.
Just to keep things tidy.

Many thanks.

"Guido" wrote in message
...
what about using the OnTime event rather than an infinite loop?

Guido

HoloGuides
http://hologuides.com/programming/ExcelVBA


"jaf" schrieb im Newsbeitrag
...
Hi,
Running a macro in an infinite loop will slow the system clock because
Windows isn't getting enough CPU cycles.
Do you use DoEvents in your loop?


--

John

johnf202 at hotmail dot com


"ccdubs" wrote in message
...
Tom,

The system clock only slows down when the macro is running, otherwise
it
remains fairly accurate.

I too was surprised at this and as yet I am unable to explain it.

All the macro does is write data to a text file and would be easy
enough
to
simulate if you are interested in trying it overnight on your own
computer.


"Tom Ogilvy" wrote in message
...
You really think his code may be slowing down the system clock?

Regards,
Tom Ogilvy


Myrna Larson wrote in message
...
Check out the Date and Time *statements* in VBA Help.

On Thu, 7 Aug 2003 08:52:56 +1200, "ccdubs"
wrote:

Hi,

I run a macro in an infinite loop for logging purposes. The
problem
is
that
this seems to slow down the system clock.

One of the variables I am logging is a reference to time set on
an
external
device. Is it possible to use this to reset the system clock
periodically?

Many thanks.