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Technical Discussions
John
John
11:13 Jul-04-2009
DAC curve with V2 calibration block??????

I was just wondering if anyone knows if you can make a DAC curve using a V2 calibration block and if you can how to do it thanks

    
 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 835

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
835
14:24 Jul-04-2009
Re: DAC curve with V2 calibration block??????
In Reply to John at 11:13 Jul-04-2009 (Opening).

Hi John,

Maybe it would be for 30º. You could plot 1/8 and 5/8 of a node and get a 2 points DAC, but for anything else, the block maybe a little too short specially when you're looking at the 60º and 70º trnasducer.

    
 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
18:55 Jul-04-2009
Re: DAC curve with V2 calibration block??????
In Reply to Michel Couture at 14:24 Jul-04-2009 .

John

Perhaps you have heard about setting evaluation sensitivity with the V2 block for the DGS method. In this case you will need a DGS diagram appropriate for the material and probe. For transducers dimensioned at 10mm or less then the signal response from the 25mm radius of the V2 is increased by the amount indicated for the equivalent flat-bottomed hole reflector diamerter at the test distance.

The V2 is not designed for the purpose you suggest - as MIchel has indicated it is far too small and also has non-parallel surfaces so there is no multiple skip possibility.

Regards

Nigel

    
 
 Reply 
 
Udo Schlengermann
Consultant, -
Standards Consulting, Germany, Joined Nov 1998, 177

Udo Schlengermann

Consultant, -
Standards Consulting,
Germany,
Joined Nov 1998
177
17:11 Jul-05-2009
Re: DAC curve with V2 calibration block??????
In Reply to Nigel Armstrong at 18:55 Jul-04-2009 .

Hello,

the calibration block no 2 according to ISO 7963-2006 is only designed for time-base calibration, sensitivity setting and simple check of beam angle and index point of small angle beam transducers.
Original text: ... calibration block no 2 makes it possible, during practical testing, to check simply, from time to time, the setting of the time base and the sensitivity of the ultrasonic equipment. Moreover, it is suited to checking the beam angle and the probe index of miniature angle-beam probes.
The denomination V2 is obsolete since 1992. The block no 2 contains only one 5 mm side-drilled hole serving as reflector for the beam angle check.
A DAC curve, i.e. signals from the same-sized reflector at different distances, cannot be generated using the no 2 block.

Best regards
Udo Schlengermann
Chairman of ISO/TC135/SC3

    
 
 Reply 
 
John
John
16:01 Jul-07-2009
Re: DAC curve with V2 calibration block??????
In Reply to John at 11:13 Jul-04-2009 (Opening).

Thanks all for your replies.

    
 
 Reply 
 
mohammed medhat
mohammed medhat
16:30 Dec-23-2014
Re: DAC curve with V2 calibration block??????
In Reply to Michel Couture at 14:24 Jul-04-2009 .

for me i think it is possible to get 2 points of DAC peaks with angle probe 60 °

    
 
 Reply 
 
David Hermanutz
Consultant,
Hbndt.com, China, Joined Jul 2012, 85

David Hermanutz

Consultant,
Hbndt.com,
China,
Joined Jul 2012
85
05:26 Dec-26-2014
Re: DAC curve with V2 calibration block??????
In Reply to mohammed medhat at 16:30 Dec-23-2014 .

Mohammad,

Please re-take your Level 1 and 2 training courses and ensure you have the correct experience time spent with knowledgeable and competent technicians, you are missing a fundamental understanding of this trade.

If you continue to examine products with your limited knowledge you would be putting people's lives in danger.

Regards,

David Hermanutz

    
 
 Reply 
 

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