I apologize if this question has been covered previously.  IPC
J-STD-001B states that assemblies shall contain less than 1.56
micrograms/sq.cm. NaCl equivalent ionic or ionizable flux residue.
There is additional wording about other methods and comparing
sensitivities but I am unclear as to whether or not the equivalence
factors in the Naval Materials Research Report 3-78 can be applied.  In
that report the 1.56 micrograms/sq.in. translates to different
acceptance limits for different instruments:

2.2 micrograms/sq. cm. for Omegameter
3.1 micrograms/sq. cm for Ionograph
5.1 micrograms/sq. cm for Ion Chaser

Can IPC J-STD-001B be interpreted to include these historical
equivalence factors?

Thanks in advance for any help you can give me.

Mary Davis
Hughes Aircraft Co.
Naval & Maritime Systems

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