I have yet to find a real relevance for the equivalence factor - it was
used to indicate relative sensitivity of measuring equipment compared to
the original manual method of determining board cleanliness. As long as you
test the linearity of your contamination measuring equipment (i.e. 1:1
reading:salt put in), or determine the drift, you will know what your
machine is capable of in absolute terms.

It's my conclusion that the equivalence factor is an unnecessary red
herring, but I still worry about it and would love to be convinced about
how it fits into the equation.

Peter



"d. terstegge" <[log in to unmask]>    28/02/2003 12:54 AM
Sent by: TechNet <[log in to unmask]>

Please respond to "TechNet E-Mail Forum."; Please respond to "d. terstegge"

              To:  [log in to unmask]
              cc:  (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
              Subject: Re: [TN] Ionic Equivalence








Hi Charlie,

I had a question about this at the end of September last year  and
received many answers (search for the thread "Ionograph measurements").
For the Omegameter 600 the equivalence factor is 1.39.
I will send you some relevant documentation off-Technet, as attachments
are stripped by the Technet-server.

Daan Terstegge
Thales Communications
Unclassified mail
Personal Website: http://www.smtinfo.net


>>> [log in to unmask] 02/27/03 05:16pm >>>
I need to meet a Bellcore requirement on an assembly of
6.45ugrams/sq.in.
(Based on the pwb surface area)

The assembly has 633.5 sq.in. surface area.

The customer has supplied me with documentation from;
Physical Design and Manufacture of Telecommunications Products PWB
Assembly
Requirements,  GR-78-CORE, Issue 1, Sept 1997. Section 7.1.3.9

I have an Omegameter 600. Is there an equivalence factor, etc? Or is it
a 1
to 1 deal?

Thanks in advance.

Charlie

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