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ChnCFCFiltCalc SAE J211 Oct 88 vs Mar 95



I have two questions


1) Does diadem v8.0 & v8.1 use SAE J211 Oct 88 or Mar 95 for CFC filtering? (I suspect it's 88 as it is in the mathamatical background of the help, but I need to be sure)


2) What is the difference between the two?


I need this information to determine the correct ISO channel filter class code i.e.

A or E

B or F etc.


Thanks for you time


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Hello lewis.may,


the CFC filter algorithm in Diadem is a Butterworth 4-pole phaseless filter according SAE J211 Mar 95, Appendix C. We are using this implementation also for our current version 11.



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Have the CFC filters been updated to SAE J211 July 2007?

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A filter which meets J211 '95 should meet the criteria specified in J211 2007

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