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Can you measure voltage or resistance without power?

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robertrobert905

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I plan to have an analog potentiometer too be hooked up to a stationary bike and when the bike turns left or right, the potentiometer 's dial is going to change and the output will be sent to a DAQ then to labview on a computer.

My question is do i have to power the potentiometer for the to be able to read the output. also can anyone suggest what resistance of potentiometer i should use for this application? I want a 180 degrees of rotation and I've decided on a conductive plastic one because I read that they are less sensitive to noise and have a long life.

thanks for helping me in advance!
 

robertrobert905
yes, you need a power source to apply some voltage to potentiometer. Edge pins connected to ground and +V, middle pin is your output to measure. Value can be anything from 10K to 500K. For the +V voltage you need to check the input voltage range of you eqipment.
 
robertrobert905 said:
My question is do i have to power the potentiometer for the to be able to read the output. also can anyone suggest what resistance of potentiometer i should use for this application? I want a 180 degrees of rotation ..
Click to expand...

You need a supply voltage, say 5V, no "power" means no output voltage, and the DAQ cards read voltage, not resistance ..

Any value between 1kΩ to 10kΩ should be fine ..

IanP
:D
 
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