Re: Current measurement

Rich Grise wrote:

On Sun, 11 Sep 2005 07:03:37 +0000, Reg Edwards wrote:


OK.  Please enlighten me as to how a method to count of pulses can
either increase or reduce the number of pulses generated as compared


to the

number of generated pulses when the pulses weren't counted.

Jim 

===============================

For example, a noise spike can trip the counter.

There is ALWAYS noise present. It is a matter of probability whether or
not an error will occur in a given time interval.

The probability may be exceedingly small but it ALWAYS exists.

Don't delude yourselves.  The measuring instrument ALWAYS interferes with
the measured value.  No need to go beyond the simple voltmeter to
illustrate the point.

Another way of looking at it  - the measuring instrument abstracts
information  - and information = energy. ----
Reg.



I think you're being just a little bit extreme here - for example,
when I hold a tape measure up to my foot, it doesn't change the
length of my foot.

Thanks,
Rich


  But it *does* change the length of your leg...
.

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