Re: Difference in instruments measurements
Re: Difference in instruments measurements
- Subject: Re: Difference in instruments measurements
- From: Marco Ugolini <email@hidden>
- Date: Thu, 05 May 2005 00:26:56 -0700
In a message dated Wed, 04 May 2005 18:39:34, Ray Maxwell wrote:
> I would suggest you find someone with a set of ceramic tile standards. These
> cost many hundreds of dollars. You could also order a "Lab-Ref" from the
> "www.idealliance.org" web site. I think these only run a little more than
> $100 U.S. You should have third party standards that are not from the company
> that make your instruments. These standard should be traceable to
> international standards. Then you can check your instruments and decide which
> instrument needs recalibrating at the factory.
Ray,
I went to the IDEAlliance site, but they don't show a picture of what the
Lab-Ref samples look like. Do they come with a list of the expected L*a*b
values for each of the patches? If not, how else do they function as
benchmarks for the integrity of a measuring device?
Also, I understand they come already laminated, and the site claims that
this doesn't affect the readings. Is that true in your own opinion?
What is your experience with Lab-Ref? Do you use them, and how do they help
you? Would you deem them essential for keeping an eye on measuring device
behavior? Are they worth the $265 investment? And do they drift with time?
So many questions...
Thank you very much for your time.
--------------
Marco Ugolini
Mill Valley, CA
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