Helmholtz Coil Set Up

[@seahorsecorral]

You show 6 inches from the coil to the grounded wall plane, but isn't the distance through the plywood (away from the camera) less? Maybe 1 inch. How far from the wall would you need to stand off, with an insulator, to be close to the calibrated levels (near zero effect)?

[@9ci]

Excellent question, very observant, thanks! We're seeing a near zero effect after about 3 inches, so our plan to suspend the plywood a short distance from the wall will work fine. We still did a complete re-calibration to ensure there were no new reactive effects at some frequencies