These 'equivalence factors' were about the most stupid thing that ever came out of MIL specs (MIL-P-28809A, to be precise). They were absolutely meaningless, like calibrating a micrometer with a wooden foot rule. It tried to reduce the instruments down to the level of the spray from a wash-bottle test which alone could easily introduce errors of 48% or more. Furthermore, the instruments it refers to were those of 1981, which bear absolutely no resemblance to those marketed today. I refer you to Bergendahl and Dunn 'Evaluation of Test Equipment for the Detection of Contamination on Electronic Circuits', European Space Agency Technical Memorandum ESA STM-234, Paris (1984). This document not only verifies that the notion is nonsense, but that the so-called 'equivalence factors' for each instrument varies greatly with both the flux and cleaning process used. This notion of 'equivalence factor' should be relegated to the oubliettes once and for all. Brian On 16/02/2012 21:59, Richard Kraszewski wrote: > While I realize that IPC specifically and the industry in general, does not support the use of ROSE correlation factors for the various testers, I have a need to see the official document that at one time quoted these specifically allowed factors. > > I took a cursory look though all 230 pages of IPC TR 583 and didn't see that table. > > I seem to recall a military specification that had that table. Was it 454? 28809, 2000? > > Does anyone recall? > > > Rich� Kraszewski / PLEXUS > � > > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________