LOL:)

Anyways, I disconnected the BOB from the VFD and I can get sensible measurements from 0 - 10v so it seems the BOB is fine, the output is not linear though.

When connected to the VFD, no voltage again and the motor stops as soon as the meter is connected.

Very odd.

I did make a lookup table of speeds so I can easily set what i really want even though its not what it displays.