2 Replies Latest reply on Nov 7, 2013 2:08 PM by rholt

    ERF values that need negative numbers


      How do you deal with ERF Values that need to be set at a negative number? For instances I would like to define a minimum heel distance of -2, 0, 5 so it matches IPC-7351 requirements. Can this be done? Are there any intentions to allow this in this future releases?

        • 1. Re: ERF values that need negative numbers

          ERF ranges can not stradle between positive and negative numbers.  The number need to either be all positive going up or down.  This is because all measurements are positive measurements, there is never a distance less than 0.  In your example below, what you are indicating is the the heel distance, or the bent portion of the lead, can be 2 mils off the pad.  If that is the case and you want to find conditions that are great than 2 mils off, that is a different requirements and should be entered into the IDEA site.  Please provide the proper reference material to assist in any potential developement.



          Max Clark

          • 2. Re: ERF values that need negative numbers

            Thanks for the quick response Max.


            Randy Holt

            (925) 249-4112