12-25-2017, 10:08 PM
With the shaft facing towards you and the 3 closest terminals pointing downward. Connect your ohm meter to the two terminals to the left. With the shaft turned all the way ccw you should read pretty close to 0 ohms (shorted). This is typically were most of the wear happens and is the failing point. Turn the shaft cw so it is in the half way position and you should read about 10% of the total resistance in your case 300K. With the shaft turned full cw should read the full resistance of 3M. Best to use an analog meter as worn spots with cause the needle to jump around.
GL
GL
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
