Re: Media Testing for maclife.de
Re: Media Testing for maclife.de
- Subject: Re: Media Testing for maclife.de
- From: David Scharf <email@hidden>
- Date: Tue, 16 Sep 2008 20:11:50 -0700
Chris Cox wrote:
Date: Mon, 15 Sep 2008 20:40:06 -0700
From: David Scharf <email@hidden>
Subject: Re: Media Testing for maclife.de
Woah!
Hi Chris,
I understand your point, however the form of your statement seems to
make huge assumptions.
Chris Cox wrote:
A measurement cannot be wrong. It is just a measurement.
But sure measurements can be "wrong", incorrect, or inaccurate. I guess
you are assuming that the instrument is very well calibrated. But even
then the question is "how accurate".
The measurement is not wrong - it is just a number or set of numbers.
But the meaning you assign to the measurement would relate to the accuracy
and precision of the instrument used to make the measurement plus the
experimental setup from which the measurement was made.
The interpretation of the measurement may not match a standard, or other
measurements -- but that simply means that something is wrong with your
interpretation of the measurement(s).
The concept is incorrect. Suppose you take 2 Kiethley 2001 DVMs and
measure a NIST traceable standard of 5.000000 VDC. Instrument #1
measures 5.0001 VDC and instrument #2 measures 4.6875 VDC. I say
instrument #2 is just plain wrong and instrument #1 is well within
specified tolerance of accuracy. According to your theory, instrument #1
is correct, and if I understand you correctly, instrument #2 is also
correct, but with an explanation and interpretation of the circumstance.
That's a pretty far out philosophy for an exacting science. We have
calibrated instruments so we don't have to explain the entire
circumstances for all things with every measurement. As I said, I
understand your basic point, that the circumstance is important to the
interpretation of a measurement, but the way you stated it is far too
broad.
Yes, I'm simplifying - I am assuming that not everyone has a background in
the sciences.
My science background is in Physics and Electronics, but there may be
many people reading this with not much science background. I know you're
a knowledgeable person, since I saw you name on the Photoshop credits list.
How you interpret the measurement, what meaning you assign to the
measurement, and how you compare different measurements can be wrong.
And yes, the interpretation of measurements is a very important part of
the science (metrology). One has to understand their instruments and the
conditions of measurement for a good interpretation of the measurement
data. Additionally, there are numerous conditions when the act of
measurement itself changes the data.
All the best,
David
--
*DAVID SCHARF PHOTOGRAPHY*
Scanning Electron Microscopy
Phone 323-666-8657
Los Angeles, CA 90039
http://www.electronmicro.com
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