Hi Peter,
Can't imagine the Omega meter type of tests to be of any value. Especially
when considering the use of Water Soluble fluxes. Why not send them out for
test to someone that can justify the capital investment for serious
cleanliness test resources.
Mel Parrish
Director, Training Materials Resources
Soldering Technology International
102 Tribble Drive
Madison, AL 35758
256 705 5530
256 705 5538 Fax
[log in to unmask]
www.solderingtech.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of
[log in to unmask]
Sent: Thursday, December 19, 2002 10:16 PM
To: [log in to unmask]
Subject: [TN] Cleanliness measurement equipment
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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