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Accuracy problem

girish
I am facing accuracy problem when i converted board file from mils (2 decimal place) to mm (4 decimal place ) again converted back to mils its showing 0.01mils less showing drc through out the board. & when I measure the pitch b/t pin (unit mils) it is incrasing by 0.01mils .REgards,GIirish
  • KeithP
    Do not convert boards between metric and imperial units. Unlike some CAD tools where the database units are just a display, Allegro actually converts and as a result you get rounding of all features including padstacks, pitches, line widths etc. This can turn the database into a right mess. Always set up the database in the unit of choice and stick to it, never change it.

    Cheers,

    Keith
  • pakistan

    HI Girish,

    We have done this type of changes almost in every board but never facing this problem. I think the prblem is that you start with accuracy of 2 decimal places and jump to 4. We always use 4 decimal accuracy sometimes it create problem having 4 decimal places accyracy with mils but it can be solve by using 4 decimal accuracy with mm and than you move to mils and increase the accuracy to 4. If it works please let me know.

    Regards

    Tanveer

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