[Deetman]

Originally Posted by iambujo

Thanks Guys - would you agree that 1Mohm is indeed isolated? After all it meets the requirement and is greater than 10K. Or if you saw it would you be concerned that it could indicate a lack of isolation somehow?

I just want to make sure I am thinking about this correctly - clearly if we have a problem we need to fix it. (In other words, does it seem more like getting on the same page with the inspection team and Lead inspector, or that we do actually have an issue?). Since 1M is > 10K, I logically thought it indicated we were good to go.

Any idea what is a typical/average reading?

Thanks again

For the purposes of FIRST, I'd say 1Mohm is indeed isolated, especially since they've spec'd it. I'd say your first priority would be get on the same page as the inspector and lead inspector and see what, if any their concerns are.

I couldn't guess a typical/average reading but I know on 1712's robot this year and last, we couldn't get any resistance reading (out of range) on the meter. It was a good Fluke and out of limits is >40Mohm on it.

If I had to guess, there is a sneak path somewhere on the robot that you are picking up your ~1Mohm resistance. Possibly a shorted motor winding. It probably isn't a problem but I would either want to find the root cause or keep monitoring it even if it passes inspection, but that is just me.

You aren't using a Banebots RS-775 motor are you? They were notorious last year for having shorting issues, some of which started around where you are and got progressively worse.