where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

910 views
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.

 
 Reply 
 

Product Spotlight

Ultrasonic Probe Recharacterization Service

NDT Systems offers a comprehensive Aftercare and Recharacterization Service for all our ultrasonic
...
probes. The Recharacterization Service is fully compliant with International ASTM E1065 Standard Guide (and other applicable standards) and offers complete documentation, traceable to the ASTM E1065 Standard. For more details or to schedule Recharacterization Services contact ndtsales@ndtsystems.com
>

Ultrasonic Squirter/Gantry System

TecScan’s NDT Ultrasonic Gantry Systems are industrial Squirter scanners designed for non-destru
...
ctive quality testing and raster scanning of large structures and parts. The Gantry Systems are usually composed of an Industrial Mechanical Scanner and a Control Room with System Workstation.
>

Echomac® PA Tube Weld Tester

The new robotic Echomac® PA TW is an operator friendly test system for detecting weld zone defects
...
in tube and pipe caused by scarfing or welding processes. Electronic scanning ensures that the entire weld zone is covered without the need for mechanical movement or operator adjustment.
>

NDTkit RT

NDTkit RT, TESTIA's Digital Radiography software The NDTkit product line software for X-ray analysi
...
s. NDTkit RT is a software benefiting from the Ultis kernel which is dedicated to radiographic image analysis. It offers a set of tools and filtering processes to assist RT operators in finding relevant flaws.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window