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Hi-Spec Systems
we are specialised in the design, development and manufacture of Phased Array and Time-of-Flight Diffraction (ToFD) ultrasonic inspection systems.
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Technical Discussions
zaidi
zaidi
05:18 Jun-16-2009
Instrument with attenuation : b-a-c

Hi everyone,

I've been confusing about expression "Instrument with attenuation : b-a-c" in AWS D1.1 2006 Sect.6.26.6.5.Could you please explain me about it, And when we have to use the formula(b-a-c) instead of the a-b-c? As my knowledge that most UT Technicians only use the a-b-c when they evaluate every defect found.Thanks in advance for further kind explaination.

Best Regards,
Zaidi

 
 Reply 
 
Ed T.
Ed T.
08:27 Jun-16-2009
Re: Instrument with attenuation : b-a-c
In Reply to zaidi at 05:18 Jun-16-2009 (Opening).

Some of the UT instruments "in the old days" had atenuation controls rathe rthan gain controls. It would reduce gain as you turned it up rather than increase gain. I am not even aware of any modern day instrumentsthat have it.

It's just the opposite so AWS used "b-a-c=d" instead of "a-b-c=d".

 
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