I am looking for a document that describes a generic database design
for calibration system.  I have previously found this document but I
can no longer seem to find it.  I think I found a link on Google which
took me to a site that had a reference to the document in question. 
The document is available in electronic format (at no cost).

My recollection is that the document may have been a PDF or PPT file. 
It was more or less a presentation and I believe it was presented at a
technical conference.  The paper advocated a flexible data structure
for performing calibrations.

I have tried a lot of searching on Google and a little on Yahoo
without success.  Example searches included:

	calibration database structure design
	calibration data structure SQL
	inspection attribute SQL linearity flexible

I am not absolutely positive but I think it is a 30- to 50-page document.

You will know you have the document if it gives you details
information on what data structures you should consider in making a
calibration / inspection database.  I believe it was specific to
measuring instruments, sensors, transducers, and the like.