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How to Measure Creepage Clearances

rtzaudio

I have a client that is working to get a PCB through UL certification. I

need some way to measure the minimum clearance between any two nets. In

other words I might need to know the minimum clearance between any two

traces/polys (eg, whats the min clearance between +15V and +5V? for

example).

 

Is there any ULP or way to figure the minimum clearance between two

different net signals on a board? Any suggestions would be greatly

appreciated!

 

Best Regards,

 

Bob Starr

 

Parents

  • Hi

    you can try CLASS in the "Matrix-mode"

    One for the +15V net and one for +5V net

    than you can go higher step by step the Clearence till the Error-Message in the DRC

     

    CLASS 2 TEST5V ; CLASS 3 TEST15V 2:0.4mm

    CHA CLASS 2 click the +5V-Net

    CHA CLASS 3 click the +15V-Net

    DRC

     

    best regards,

    Hans Sorgatz

Reply

  • Hi

    you can try CLASS in the "Matrix-mode"

    One for the +15V net and one for +5V net

    than you can go higher step by step the Clearence till the Error-Message in the DRC

     

    CLASS 2 TEST5V ; CLASS 3 TEST15V 2:0.4mm

    CHA CLASS 2 click the +5V-Net

    CHA CLASS 3 click the +15V-Net

    DRC

     

    best regards,

    Hans Sorgatz

Children
  • in reply to lbrer

    Hi Hans,

     

    Thanks for the tip, I'll give this a shot. To be honest, I've never really understood how the class matrix stuff worked or what it was used for. Tracking down all the places to put the nets will the hard part. But, maybe it won't be so bad if this can give me the info they need.

     

    Regards,

     

    Bob