[SI-LIST] Re: How to solve short circuit issues in high dense pcbs
- From: "Smith, Justin D." <Justin.Smith@xxxxxxxxxxx>
- To: si list freelist <si-list@xxxxxxxxxxxxx>
- Date: Mon, 31 Oct 2011 09:02:25 -0500
We have a Polar Tone Ohm 950 to help locate "difficult to find" shorts. And it
follows similar principles as Steve describes. You attach 4 different colored
wires to GND locations nearest the 4 corners of the board, and then you "probe"
the power plane with the short in various locations with a 5th connection that
supplies a low voltage current source. The test equipment then makes a "tone"
and indicates a direction to move your probe (closer to the specific colored
GND connection) until you "hone" into the short area. It might help you.
http://www.polarinstruments.com/pdf/brochures/Toneohm_950_screen.pdf
As they state in their brochure "it provides a non-destructive means of tracing
short-circuits to their point of origin. The instrument offers four operating
modes, which cover virtually all categories of hard and soft PCB shorts,
including etch problems, solder bridges, stuck bus lines and faulty decoupling
capacitors." Look it up online.
And I don't work for Polar Instruments.
Justin
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