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September 1999

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Subject:
From:
Ramsey's <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 1 Sep 1999 06:38:39 -0400
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I understand that this type of test is appropriate for benchmark
evaluation of a cleaning process. The actual value given from a test
does not tell you that the boards are clean. The test results tell you
if a process has changed. As I recall 9 micrograms/sqcm is Bellcore and
23 is the MIL number. It is important to remember that the result is an
average of contamination across the entire assembly. There may be local
concentrations of contamination that are unacceptable.

Were you looking for a copy of an owners manual a while back? Contact me
I can get you a copy.

Omega meter Question
    Date:
        Tue, 31 Aug 1999 14:14:58 -0700
   From:
        "Davis, Mary M." <[log in to unmask]>



My apologies if this question is a repeat.  I sent it once but did not
see
it posted or see any response so I am trying again.

I have run across an internal specification which applies an equivalency

factor to the maximum allowable limit for an Omegameter 300 and an
Omegameter 600 - but NOT to the maximum allowable limit for an
Omegameter
500.  In other words, the maximum permissible micrograms NaCl eq./sq.cm.
for
the Omegameter 500 is less than that for the Omegameter 300 and
Omegameter
600.   Can anyone explain the logic for this?  Is the Omegameter 500
different?

Thanks in advance for your help.

Mary M. Davis
Eldec
425-743-8327

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