Albert,
I agree totally with what Doug and Brian have stated. The 15 minute test
time came from a MIL-STD. It was my experience that usually after 5 minutes,
the amount of ionic residue collected would be monitored. I will indicate
that some of our customers have boards so dirty that the test will exceed 20
minutes, but that is usually not the case. Assuming that your process is
under control and is cleaning properly, the omegameter test would last
approximately 15 minutes.
Concerning the report, I can provide it to you (or anyone else)
electronically, but since it is approximately 15 Mbytes in size (over 200
pages), I can provide it to you if you contact me directly. Some people have
tried accessing it from our website, only to have their server come to its
knees when a 15 Mbyte E-Mail goes through. Call me with your address and I
will get it to you.
One other thought. If your omegameter is old, you may want to consider
getting it checked out. I have seen Omegameters with the Kenco label on them
instead of either Alpha Metals or Cookson Electronics. If you have an old
Kenco omegameter, I would suggest contacting Alpha Metals / Cookson on
getting a new system since when I last checked, the Kenco units are no
longer being supported. If you DI columns are dirty, this could prolong the
test and make your test results inaccurate. Their website is:
http://www.scscookson.com/instruments/
Good Luck.
Lee Whiteman
Senior Manufacturing Engineer
ACI / EMPF
Telephone: (610) 362-1200; Ext. 208
FAX: (610) 362-1290
E-Mail: [log in to unmask] <mailto:[log in to unmask]>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Douglas Pauls
> Sent: Monday, October 23, 2000 9:21 AM
> To: [log in to unmask]
> Subject: Re: [TN] Fw:About Cleanliness (Solvent Extract Conductivity)
>
>
> In a message dated 10/23/2000 7:02:13 AM US Eastern Standard Time,
> [log in to unmask] writes:
>
> > Hi TechNetters,
> >I need some help regarding Cleanliness. Now I have an
> >automatical test machine whose name is omega 600. I usually test 10
minutes > >for cleanliness of PCB. Can anyone give me the best advice about
the test > > >time of omega 600 machine which is used in PCB and tell me the
cause ?
> >
> >Albert Lai
> >TEL : 886-3-323-1111 ext 5381
> >FAX : 886-3-323-6611
> >E-MAIL : [log in to unmask]
> The 10 minute test is the one that has been in historical
> military specs for ages. No one tests longer than this because the
numbers
> >just keep going up.Sometimes from leaching of the product, sometimes from
> >carbon dioxide mixing from the air. If you want to know more about these
> >instruments and their general shortcomings, you should read EMPFs report
> >RR00013, "An In-Depth Look at Ionic Cleanliness Testing". You can get it
at > >EMPF.org or the IPC is working on making that available as an IPC
technical
> >paper.
>
> Doug Pauls
> CSL
>
> ------------------------------------------------------------------
> ---------------
> TechNet Mail List provided as a free service by IPC using LISTSERV 1.8d
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF TECHNET
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
> additional
> information, or contact Keach Sasamori at [log in to unmask] or
> 847-509-9700 ext.5315
> ------------------------------------------------------------------
> ---------------
>
---------------------------------------------------------------------------------
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF TECHNET
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------
|
