Thanks for the reply, you've got to the points I want to raise.

At 18:03 07/04/98 EDT, you wrote:
>I have a copy of MIL-P-55110A, dated 18DEC64 which

This is frightening to someone born in 63!!!


>To use other sizes of comb patterns, especially closer ones,
>we probably need to change that value.
>
>
>
>Susan Mansilla
>Robisan Lab
>

This is where I wanted to go......

It would be nice to have resistances which are considered safe by the IPC
for different spacings. What are the acceptable levels for each of the
different IPC combs?

If I take the IPC-B-36 comb pattern, and reduce the number of traces, to fit
in under the cavity of a perimeter BGA device, how would I establish a level
of cleanliness?

If I have different patterns to IPC (ie for use with BGAs), how do I
correlate them to IPC standard combs?

Does the trace width have any influence on the values?

If I just go ahead and obtain the values for IPC combs and home grown
designs, how do I establish a level of cleanliness?

Regards,

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