SG reading on conductivity probe dropping when T5's come on

[Roblk]

Anybody have any suggestions on where to start troubleshooting what I believe is an electrical interference problem from my T5's and my conductivity probe?

Every day when my T5's come on my conductivity reading goes down to to 30 from 33 only during the time the T5's are on and then back to normal as soon as the t5's go out. I have tried moving the ballast away from the the PM1 module, and plugging the ballast into other outlets, from a search it looks like others fixed the problem through grounding but my ballast is grounded through a three pronged plug. My T5 lights are added to my canopy with a retrofit kit in addition to my LED radions, they are only on 2hrs per day.

thanks,
Rob

[porifera23]

Was this ever resolved? I am experiencing the exact same problem with essentially the exact same setup.

[iamchadster]

Make.sure that everything is grounded. When this happened to me I found a faulty ground in a surge protector caused the stray voltage released to.affect the conductivity.