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Subject:	Re: IONIC Contam Specs
From:	Paul Gould <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Tue, 19 Jan 1999 17:18:25 -0000
Content-Type:	text/plain
Parts/Attachments:	text/plain (63 lines)

Hi Jon & Rob,

One thing to look out for on this subject, I remember reading in a mil spec
somewhere that the readings given by different machines did not agree. There
is the Ionograph, Omegameter, and I can't remember the other. The spec
quoted different acceptance limits for each type of machine; I think they
were 10,14,and 17 ug/sq in. I seem to recall that 14 was related to the
Omegameter but could be wrong. We were asked to supply PCB's to half the
stated limit to allow for contamination during assembly.

Paul Gould
Teknacron Circuits Ltd

-----Original Message-----
From: Rob Watson <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 19 January 1999 03:44
Subject: Re: [TN] IONIC Contam Specs

>Jon,
>Our Omegameter manual recommends 14.o ug/sq. in. too, but you may consider
tighter standards to achieve
>Bellcore TR-NWT-000078 cleanliness standards.  It might be better to
use.... say 6.5 ug/sq.in. as your
>pass/fail criteria to achieve this.  Hope this helps.
>
>Rob Watson
>Sanmina Corp. Plant 10
>
>Jon Cruz wrote:
>
>> Hi!
>>
>> We have an ionic contam test here in our company and I was wondering
>> if you have a specs list of what is the acceptable
>> contamination level. Here, we use a Pass/Fail limit of 14.0 ug/sq.
>> in. I am no tsure if this is too low or too high.
>> Can you please share some info on this.
>>
>> Thanks.
>>
>> Jon Cruz
>> Supervising Product Engineer
>> Electronic Assemblies Inc.
>> [log in to unmask]
>> tel.# 823-7317/7593884
>> fax# 8238326
>>
>>

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