How would you attach shield first (relocating passive sensor in to outside case)

[babysitter]

Dear group,

I'm about to relocate a passive internal sensor (dc-fed, slow, resistive) to a outside place. The device is handheld, battery-powered.
The cable has a shield and shall be attached at device side, unattached at sensor side.
I've located three possible attachment points, X1, X2, X3 and wonder which one i should try first w/ regard to ESD/EMI.
Everybodys darling GND is not included, actually, for reasons.

X1 is rather easy, positive battery, which looked at thru the AC glasses should be grounded due to bypass capacitors. Might be the most robust esd-wise as its going to the most massive power planes, but somewhat distant from sensor signal, impedance-wise.
X2 is sensor positive supply, coming from a regulator, also bypassed. Closer to sensor network, impedance-wise, but less robust.
X3 is sensor negative supply, not bypassed, but going thru a low side switch - I figure this as the worst rn.

Ignore other possible issues of the cabling, like additional capacitance at the signal line and wiring resistance forming a RC lowpass.

Any recommendations?

BR
Babysitter

[Salitronic]

The way i see it:

- X3 is definitely a no for ESD, ESD contact test on the mosfet drain will damage it, at least when it is powered off.
- X1 is best for ESD but if you have digital and other switching circuitry on VCC you'll be radiating that out off the shield. Also if X1 is directly connected to the battery without any protection you need to consider the risk of overloading the battery.
- X2 is probably a good compromise, though not ideal.