Correct wiring for a remote pot

[fish2005]

Frequently a potentiometer is front panel mounted, far away from PCB. If this pot is used as a potential divider to form a voltage reference (let say 5V input from motherboard and milivolts range output back to motherboard ), the wiring problem becomes important. So what is the ideal wiring schematic?
simple 3 wire twisted cable.
2 wire (in+out) whith 1 shield (ground) cable
3 wire (in+out+ground) whith 1 shield unconnected at one end
Or maybe a complete separate ground like 2 simple wire for +5V - 0V input whith a 2 wire shielded cable for output?
Brrrrrr...


Adrian

 

[MP1]

If it is only a 0 to 5VDC signal, you can use a shielded cable to shield against rf. Connect the shield at one end only to keep from producing ground loops.
If you are experiencing signal loss due to length, you can increase the current to the pot to compensate.
If the length is too long for this, you might want to consider a digital pot with a memory. However, this will increase the expense of the device you are making.

MP

 

[fish2005]

Thanks for your repply.
You say to run simple 2 wires for 5V and ground to the pot, and 1 shielded wire for the low voltage return?
Something like this

View attachment 39155

 

[MP1]

Should work fine.

MP