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Reply To: | TechNet E-Mail Forum. |
Date: | Fri, 20 Dec 2002 12:15:57 +0800 |
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Dear All,
What would your recommendations be for equipment to measure board
cleanliness under the following circumstances?:
Number of boards = 10 pcs per month up to a total of 280 boards.
Board size = typically VME - approx 9.5" x 6.5"
Board type = FR4, Class 3, 10 or 12 layer ENIG or HASL finished.
Assembled with 63/37 solder paste and water-soluble flux, reworked using
Kester 63/37 cored solder with compatible w/s flux
Other main residues would come from fingerprint oils and residues from
stripping Humiseal off boards using Conformox or Forane.
I am trying to set up a new capability here and am looking for the least
expensive equipment that will reliably measure genuine cleanliness levels
down to 0.02ug NaCl eq/cm^2. I can only justify equipment expenditure
against this one small contract that involves a total of 280 boards, hence
the need for cost-effective (aka low-cost) choices. So far, I see that the
Omegameter still features heavily in discussions on this topic - is it
still a good tool to use, or is it's technology too old now to be capable
of measuring accurately the high levels of cleanliness demanded by today's
high-reliability electronics? Other options, like the Zero-Ion, or
Concoat's Contaminometers, good as they seem to be, are several magnitudes
more expensive and harder to justify as a result unless there's a good
reason why less expensive options are not suitable.
I could also use your recommendations on SIR test equipment.
Thanks for any help you can offer.
Peter
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