PDP resistance

[BBaltrusch]

Could someone do us a favor and measure the resistance between the + and - terminals on a PDP? Our practice board is 77 ohms. We did have a wiring issue and popped some breakers, worried the board is toast. I know I measured each terminal to chassis on the comp bot before bag and they were fine, think I had several hundred k + to - but not sure. Don't have a 3rd PDP to check.

[Bkeeneykid]

We have two out of bag PDPs. I'll check our resistance on Monday when I next get in the shop.

[juchong]

Originally Posted by BBaltrusch

Could someone do us a favor and measure the resistance between the + and - terminals on a PDP? Our practice board is 77 ohms. We did have a wiring issue and popped some breakers, worried the board is toast. I know I measured each terminal to chassis on the comp bot before bag and they were fine, think I had several hundred k + to - but not sure. Don't have a 3rd PDP to check.

Do you have any fuses in the PDP? It may be possible that metal shavings are somehow shorting the PDP somewhere. 77 ohms is way too low of a resistance between supply rails. Keep us updated!

[BBaltrusch]

All breakers/fuses out, all wires disconnected. I opened it up and found a hairline crack in the solder mask over one of the power traces of a circuit that popped a breaker. Looks a little bulged, I can see the copper. Other side of pcb is fine. I'm guessing we're shorting to the ground plane underneath. I think she's dead Jim.

[Mark McLeod]

I get infinity, but I only went up to the MOhm range.