So it seems like I’m getting electronic interference with my strain gauge. For those of you using a strain gauge, where or how did you wire yours in to avoid the interference? Thanks.

 

dont have a strain gauge, but my guess would be to use a shielded wire

 

I looked into more and it looks like I can try shielding it or “braiding” the wires to try and reduce the interference.

 

i'd start here

https://www.prowireusa.com/c-58-tefz...lded-wire.html

 

You could try twisting the wires first to see if that works enough. Twisting helps cancel out radiated emissions from a pair of signal wires if they are out of phase (like a signal/return) since radiation from each half twist tends to cancel out. If they are just separate wires running together then you may just be able to twist them and see if it helps (aka no real cost to try it if there is enough length). This works in reverse as well as any differential voltages induced by EMI are then applied in a way to cancel out, reducing effects on the circuit from outside interference. If interference is your issue and twisting the pair of wires does not solve it, you can try a good shielded cable as shown.

If you use a shielded cable, be sure that you are grounding the shield properly (it will not really do anything otherwise. If whatever you are wiring to does not have provisions for shielded cable you will need to find a good quality ground point as close to the end of the cable (as close to the connector as possible) for the shield to attach to and minimize the amount of "unbraiding" of the shield as much as is possible. And with a shielded cable in this instance, probably best to ground the shield to the chassis (car ground) at the ECU or whatever is monitoring the strain gauge and on the end with the sensor, do not ground to chassis to prevent ground loops. If the sensor/gauge itself has a dedicated ground, then tie that to the shield on that tend, but do not tie that end of the shield or that ground to chassis.

Are you thinking something else is interfering with your strain gauge, or the other way around? At the frequencies likely used I am surprised that any filtering in the device is not taking care of that here.