Yes I meant sq.cm. It was after all Fri. and I was in a hurry to get out. I'm maxed out on vacation and have to leave work at 40 hr. 

-----Original Message-----
From: Barmuta, Mike [mailto:[log in to unmask]]
Sent: Friday, September 05, 2003 3:43 PM
To: 'TechNet E-Mail Forum.'; Charles Caswell
Cc: Barmuta, Mike
Subject: RE: [TN] Ionograph


Charles: I know it's Friday and everything but.... 
Are you sure YOU don't mean 1.56 micro grams/sq.cm.   :>)

Angela: I'm not sure what specification you are basing your pass/fail ionic
contamination limits on and what calculation you are using but your are off
by a factor of greater than 10X than most established industry limits.  

                                                        Regards
	
Michael Barmuta
	
Staff Engineer
	
Fluke Corp.
	
Everett WA
	
425-446-6076

-----Original Message-----
From: Charles Caswell [mailto:[log in to unmask]]
Sent: Friday, September 05, 2003 12:42 PM
To: [log in to unmask]
Subject: Re: [TN] Ionograph


We use 1.56 micro grams/ sq. in. This is from J-STD 001 8.3.6 ( IPC
Test-TM-650 )
Are you sure you don't mean 20 micro grams/ in sq. This was the old MIL STD
req.
Charles Caswell

-----Original Message-----
From: Angela Gregor [mailto:[log in to unmask]]
Sent: Friday, September 05, 2003 4:25 PM
To: [log in to unmask]
Subject: [TN] Ionograph


First I wanted to thank you all for the gasket information you gave.
Evidently this forum is very much respected because I didn't get any
arguments from anyone here. Here's another one. At our company we are
currently using Ionograph 500m version 3.02 to test our assembled boards
after wash. Our pass/fail limit is 20 micro grams of sodium per square
centimeters. I'm not sure our calculation is correct, and I was wondering
what other companies pass/fail limits are for comparisons. I called about
three places in my area and got three different answers. If this helps most
of our boards are double sided. I would appreciate any feed-back. Thanks in
advance.

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