The PTH size sometimes plays a role in the analysis, DOE. Always select the largest size hole on the sample in question.
"X"
-----Original Message-----
From: vladimir Igoshev [mailto:[log in to unmask]]
Sent: Friday, September 17, 2010 7:50 AM
To: Hernandez, Victor G
Subject: Re: [TN] How to measure thickness of ENIG plating inside the barrel
I see, you didn't say you had done it for XRF. It may work as long as your XRF has small enough collimator to "fit" in the remaining area of the PTH
Vladimir
SENTEC Testing Laboratory Inc.
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (416) 899-1882
Fax: (905) 882-8812
www.sentec.ca
-----Original Message-----
From: <[log in to unmask]>
Date: Fri, 17 Sep 2010 07:45:59
To: <[log in to unmask]>
Cc: <[log in to unmask]>
Subject: RE: [TN] How to measure thickness of ENIG plating inside the barrel
The dry section is conducted to more than three fourth the diameter of the barrel, enough so the XRF beam is not attenuated. The plated barrel wall is pristine.
"X"
-----Original Message-----
From: vladimir Igoshev [mailto:[log in to unmask]]
Sent: Friday, September 17, 2010 6:54 AM
To: Hernandez, Victor G
Subject: Re: [TN] How to measure thickness of ENIG plating inside the viabarrel
It doesn't matter "dry" or "wet". Au is soft and always smears unless it's directionally polished
Vladimir
SENTEC Testing Laboratory Inc.
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (416) 899-1882
Fax: (905) 882-8812
www.sentec.ca
-----Original Message-----
From: <[log in to unmask]>
Date: Fri, 17 Sep 2010 06:48:27
To: <[log in to unmask]>
Cc: <[log in to unmask]>
Subject: RE: [TN] How to measure thickness of ENIG plating inside the via
barrel
I've done a dry section of the PTH and measure the remaining barrel wall.
"X"
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of vladimir Igoshev
Sent: Friday, September 17, 2010 6:44 AM
To: [log in to unmask]
Subject: Re: [TN] How to measure thickness of ENIG plating inside the via barrel
Section will do it. Keep in mind though, that the board would have to be overplated with another layer of E-Ni to prevent Au smearing during polishing.
Vladimir
SENTEC Testing Laboratory Inc.
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (416) 899-1882
Fax: (905) 882-8812
www.sentec.ca
-----Original Message-----
From: Fabien Guizelin <[log in to unmask]>
Sender: TechNet <[log in to unmask]>
Date: Fri, 17 Sep 2010 07:14:09
To: <[log in to unmask]>
Reply-To: TechNet E-Mail Forum <[log in to unmask]>,
Fabien Guizelin <[log in to unmask]>
Subject: [TN] How to measure thickness of ENIG plating inside the via barrel
Hi
IPC-4552 calls for XRF to measure ENIG plating thickness. But, this method can only be applied to surface pads. How can we assess the quality of the plating in via barrel ? (poor plating would compromise mechanical strength and resistance to corrosion)
Thanks for your insight
Fabien
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