Coil Cable Help

[Teleno]

Interesting.
However, we also use the cable shield to discharge any electrostatic charge of the coil. Sometimes the electrostatic charge builds up on a detector and then discharges when touching the ground or even grass. I usually test the coil shielding by touching a PVC pipe that I previously electrostatically charge to several thousand volts to the coil. If I don't notice any reaction by the detector, I consider the coil shielding to be good enough.

Does anybody have a better suggestion?

My conclusion from the statements I shared is that a high value resistor connecting the floating shield of the cable to coil ground should be enough to avoid the extra capacitance, shield EMF and provide a path for electrostatic discharge. Something around 300k or more since the capacitance is so small.

Gonna try this. My coax cable has deteriorated the coil decay by about 2us, will see if I can get them back this way.

However the coil shield which is meant to isolate it from the soil's capacitance still must have a low resistance path to ground.

[Tinkerer]

My conclusion from the statements I shared is that a high value resistor connecting the floating shield of the cable to coil ground should be enough to avoid the extra capacitance, shield EMF and provide a path for electrostatic discharge. Something around 300k or more since the capacitance is so small.

Gonna try this. My coax cable has deteriorated the coil decay by about 2us, will see if I can get them back this way.

However the coil shield which is meant to isolate it from the soil's capacitance still must have a low resistance path to ground.

On the system where I tested the resistor, the trimpot was 100 Ohm and gave best results when set at 72 Ohm. It shortened the delay from about 6us to less than 3us.