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- since 1996 -

WesDyne International (AMDATA Products)
WesDyne is an engineering and technical services firm dedicated to providing standard and custom nondestructive examinations (NDE) products and systems
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Technical Discussions
Robert Taylor
,
Australia, Joined Jun 2019, 13

Robert Taylor

,
Australia,
Joined Jun 2019
13
09:14 Sep-21-2019
ET Set balance point drifting

Good afternoon gents/ladies. My question is regarding my eddy current set balancing point drifting from the centre of the screen. While scanning I’m having to continuously balance the probe as it drifts from the centre of the screen constantly. The leads and probe are in perfect working order. Someone told me to use more tape on the tip of the probe to contain the eddy currents?! But I thought I’d put it here to see what everyone’s opinion was. Thanks!

 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 805

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
805
16:06 Sep-21-2019
Re: ET Set balance point drifting
In Reply to Robert Taylor at 09:14 Sep-21-2019 (Opening).

It is either the M/c or the probe.
Just disconnect the probe and test.
Then replace the probe

 
 Reply 
 
Neil Burleigh
Sales
Krautkramer Australia Pty Ltd, Australia, Joined Dec 2002, 159

Neil Burleigh

Sales
Krautkramer Australia Pty Ltd,
Australia,
Joined Dec 2002
159
12:05 Sep-22-2019
Re: ET Set balance point drifting
In Reply to Robert Taylor at 09:14 Sep-21-2019 (Opening).

In response to your 'colleague' about using more insulating tape to contain the eddy currents tell them that you changed the type of eddy current couplant you use and that will fix that issue about containing eddy currents.
Now to the spot drift this happens for a variety of reasons in the older EC units the circuitry had to warm up. The conductivity of the material changes slightly will cause drift. Temperature changes of the material surface will also add to the mix. Also if testing ferrous welds the permability of the steel and coating thickness changes will cause drift.
Hope this helps
Regards
Neil Burleigh

 
 Reply 
 
Robbie
,
Australia, Joined Jun 2019, 13

Robbie

,
Australia,
Joined Jun 2019
13
02:06 Sep-23-2019
Re: ET Set balance point drifting
In Reply to Neil Burleigh at 12:05 Sep-22-2019 .

Thanks very much for your reply mate. All makes sense, I just wondered if it could be a setting on the set itself etc. Cheers

 
 Reply 
 
Keith Brewer
NDT Inspector,
New Zealand, Joined Sep 2019, 8

Keith Brewer

NDT Inspector,
New Zealand,
Joined Sep 2019
8
02:54 Sep-26-2019
Re: ET Set balance point drifting
In Reply to Robert Taylor at 09:14 Sep-21-2019 (Opening).

Hi Robert

I have experienced such drift on occasion and put it down to the balance coil in the probe warming up as I held it.

 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 889

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
889
02:34 Sep-27-2019
Re: ET Set balance point drifting
In Reply to Robert Taylor at 09:14 Sep-21-2019 (Opening).

Robert,

Could you give us more information about the probe you are using and the material involved. This will greatly hrl^in finding a solution to your probleme.

 
 Reply 
 

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