[PSUBS-MAILIST] question

[Jon Wallace via Personal_Submersibles]

Rick,

Select the OHMS setting on your multimeter, then connect one probe from the multimeter (it doesn't matter which one) to the center connector on the POT.  

Test-1, connect the other probe from the multimeter to the left connector on the POT.  Turn the potentiometer in both directions and observe the results on the multimeter.  The displayed number on the multimeter should be large (5-10k) in one direction and small (near zero) in the other.  

Test-2, remove the probe from the left connector and attach it to the right connector on the POT.  Turn the potentiometer in both directions and observe the results on the multimeter.  The displayed number on the multimeter should be large (5-10k) in one direction and small (near zero) in the other.

If in both cases you have observed a large range, for example 10000-0, or 0-10000, then your POT is functioning correctly.  Any other result is indicative of a defective POT.  Note that this specific example assumes your potentiometer is rated at 10k.  If you have a 5k potentiometer the maximum value you will see is 5000.

Jon



On Monday, October 6, 2025 at 08:50:00 PM EDT, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote: 

Hi Alan, couple of questions,, I don't understand what you mean by "Changing the red and black? when you say "put the probe on the side one and middle one and should get 5V, what position should the potentiometer be in? neutral or full ahead or astearn? 
also, when I energise the potentiometer, the motor just goes full tilt in one direction 
so I assume it has to be energised to look for that reading?

Rick