Subject:                               Time:10:23 AM
  OFFICE MEMO          None                                   Date:9/26/95
Jim Marsico asked:
Can anyone tell me the correlation between micrograms/square centimeter and 
resistivity for PWB cleanliness?

Look in IPC-TM-650, 2.3.26.1, Ionizable Detection of Surface Contamination
(Static Method).  This test method shows the formula for the relationship
between solution resistivity (starting and ending) and micrograms/sq. in. 
The formula is also in our Omegameter 600SMD owners manual.

Mary Davis
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