Hi Joe:
                  It is system dependent, how clean the chamber walls are, what kind of chemicals used, how clean the sensor is. The system should be run several times without any load. Then you should decide how clean you want your boards and shoot for 80% or 90% of the last reading, it is up to the customer requirements. Lastly a board should be checked with an Omega meter to let you know where you are. 0.1 to 0.8 megas is about the right range of the resistivity. Boards that have fine pitch and ultra fine pitch components or class three would need further cleaning in another chamber for polish cleaning.
        Regards,
        Ramon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Macko, Joe @ IEC
Sent: Saturday, February 19, 2005 3:51 PM
To: [log in to unmask]
Subject: [TN] acceptable Final rinse DI water resistivity in a batch
type clean er


Hi,



We are evaluating the cleaning ability of a new batch cleaner, which has the
ability to monitor the resistivity of the actual DI rinse water throughout
the rinse cycle.  I checked the archives as well as other sources and it
seems like the consensus ranges from 100K to 750K ohms with most suggesting
500K ohm as a good, acceptable resistivity level.  I am trying to establish
a basis for what is an acceptable final rinse resistivity level for the
boards we process.  We use RMA based flux.  We also have an incoming DI
rinse water resistivity meter for reference.



Would anyone be so kind as to point me in the right direction?  Thanks in
advance.



Joe




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