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Technical Discussions
David Harvey
Engineering
ATI - Wah Chang, USA, Joined Nov 2002, 42

David Harvey

Engineering
ATI - Wah Chang,
USA,
Joined Nov 2002
42
23:46 May-13-2009
"Calibration" of digital UT instruments - AMS 2631 et al

I am installing some new digital instrumentation on a testing line, which is used to test product IAW AMS2631 and AMS2632.

With regard to "calibration", or as I prefer to term it :"performance verification", I have run into several difficulties.

First, sometimes we see changes as the instrument shifts from one amplifier "stage" to another as we progress through the range of the gain. How do you deal with these "jumps" in gain?

Second, horizontal linearity is pretty much worthless, but required, on a digital instrument. How do you document your horizontal linearity?

I don't have the luxury of being able to negotiate the calibration with a Customer, since much of this material goes to a warehouse and all the purchaser wants is something with the right line marking on it. No place to go negotiate, I simply have to comply.

Any other pointers on the performance verification of digital "scopes"?

 
 Reply 
 
Roger Duwe
NDT Inspector, API-510, 570, 653
MISTRAS, USA, Joined Jan 2009, 148

Roger Duwe

NDT Inspector, API-510, 570, 653
MISTRAS,
USA,
Joined Jan 2009
148
15:14 May-14-2009
Re: "Calibration" of digital UT instruments - AMS 2631 et al
In Reply to David Harvey at 23:46 May-13-2009 (Opening).

Is it possible that you have a low-grade 'scope? I have 'calibrated' numerous Panametrics [Olympus] and Krautkramer [GE] digital thickness and flaw detector units, and never have seen the issue you describe. Epoch III & IV, Kraut USM-35, USM-50, 52, 58, 60.

I would suggest that you involve a tech expert [vs. salesman] from the manufacturer. It really shouldn't be doing what you are seeing.

 
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