[ATM] Focualt Test Error

[jonathan_bishop at sbcglobal.net (Jonathan Bishop)]

Robert,

That is my experience also, about +- .003". Probably with more
practice/better conditions others can do better.

So what is the effect of being off by .003"? It might be interesting to run
one of the data reduction programs, like FigureXP and see the difference. I
suspect that that type of accuracy is OK, but others may disagree.

Jon

----- Original Message -----
From: "Robert Turner" <rbturner@charter.net>
To: "ATMList Post" <atm@atmlist.net>
Sent: Friday, March 12, 2004 5:02 AM
Subject: [ATM] Focualt Test Error


> What is the sensitivity of the focault test to error in KE readings? When
> doing several readings together how closely should the readings match
before
> the error is too great to make the set of measurements invalid?
>
> If for example I am doing a set of 4 measurements on a 4 zone mask. How
much
> difference in the offset readings for any 1 zone is too much? In the
> readings that I am doing I seem to be getting a difference of .003" for
the
> position of any 1 zone over 4 readings.
>
> Robert
>
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