Here's the link to Louis' article, for those who are interested.

http://pcdandf.com/pcdesign/index.php/editorial/menu-features/9553-inspect
ion-1409


Best,

Mike

Mike Buetow
PCD&F/Circuits Assembly
w/m: 617-327-4702
@mikebuetow

The 2014 CIRCUITS ASSEMBLY Directory of EMS Companies:
circuitsassembly.com/dems



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Louis Hart
Sent: Wednesday, October 08, 2014 3:18 PM
To: [log in to unmask]
Subject: Re: [TN] IPC-TM-650 section 2.2.2, Optical Dimensional;
Verification

Victor, Chris, et al., OI-645 came out in 1993.  At one time I was chair
of the committee (immediately after it was published), and had plans to
correct some of the typographical and formatting errors.  Plans which did
not bear fruit. If anyone is interested and wants some perspective, I
wrote, with the assistance of a co-author and Mike Buetow, an article in
the Sep 2014 PCDF/CA that prominently mentions OI-645.  Louis Hart

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Mahanna
Sent: Wednesday, October 08, 2014 3:08 PM
To: [log in to unmask]
Subject: Re: [TN] IPC-TM-650 section 2.2.2, Optical Dimensional;
Verification

Hi Victor
It is OI-645 (OI for Optical Inspection)
https://portal.ipc.org/Purchase/ProductDetail.aspx?Product_code=ea182080-b
586-db11-a4eb-005056875b22

There is a related resolution target with P/N IPC-OI-1951, based upon
MIL-STD-150A (USAF 1951) mathematical standard.
The tool can be used to assess resolving power from human eye to 645
lp/mm.
http://www.precisionopticalimaging.com/

Chris

Chris Mahanna
Robisan Laboratory Inc.


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