The tightest clearances are where an etch runs between two pin on the ribbon
cable connector. The connector pin are spaced 0.10" apart. The pads are .060"
octagonal pads so edge-to-edge is a .04" gap. A .016" trace runs in that gap.
So there is a .012" clearance between the pad edge and trace. Worse case would
be 300V bridging that gap, but the Fluke edge connectors are set up so that (I
think) the highest potential difference is 190V (between the +/-190V lines and
GND. There is a possibility of +300V and a signal called /LIMIT.
The layout/pad sizes could be tweaked some and that .012" gap could be
increased to maybe .020" A board layout that didn't run etches between pads
is not practical and/or would require a board size that exceeds that permitted
by my CAD program (or requires a $1700+ upgrade). So what's the safe arc-over
distance for 300V on a G10 circuit board?
The ATTEN, PWR AMPL, and PWR SPLY boards all have the high voltages on
them... and they aren't on the same pins...
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