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 -
222 views
Technical Discussions
ndt1
ndt1
02:22 Aug-27-2004
Transfer Values / Defect Ratings (Indication Level)

What way do most people here (or what is the proper way) to identify transfer value and defect ratings(indication level)?

If you check your transfer value between your cal block and the piece being inspected and the signal comes up lets say 4db above DAC when on the test piece. Is this considered +4 TV because its +4db over DAC or is it a -4 TV because you have to remove 4db to bring it to reference level?

The same question applies when rating defects. According to ASME you have to record anything that is greater than 50% DAC, so a defect thats at 50% DAC, is this considered a rating of -6 because its 6bd lower than DAC or is it +6 because you have to add 6db to bring the signal to reference level?


    
 
 Reply 
 

Product Spotlight

NEW Wheel Type Phased Array Probe

DOPPLER NEW Wheel Type Phased Array Probe, more stable, new tyre makes lesser acoustic attenuation
...
, much lighter makes easier to handle, more slim size, magnetic and mechanical encoder optional etc...more
>

Echomac® Small

Available with up to eight channels of electronics to detect and evaluate thickness, flaws and eccen
...
tricity, this UT tester is housed in a convenient, smaller cabinet. This instrument can be used in conjunction with bubbler or immersion tank systems, or with a test bench or in laboratory applications. The Echomac® Small is available in the FD4, FD6 or FD6A versions.
>

Wireless TOFD scanner

Quick, accurate and highly reproducible welds testing. The System operates wirelessly and is compat
...
ible with any type of Windows based Laptop, Desktop or Tablet.
>

Varex Imaging Large Field of View (FOV) Digital Detector Arrays (DDAs)

A larger FOV DDA can reduce the space and volume of the X-ray inspection system on the factory floor
...
, enable faster scanning times, better throughput and better resolution images at a lower dose. Customers can also save time and money. With these benefits in mind, Varex Imaging has designed a family of large FOV detectors (4343HE, XRD 1611, 4343DX-I, 4343CT) for our industrial imaging customers.
>

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