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Signal noise

 Hello.

 

Im using an myDAQ to analize a joistick with an hall sensor. Im using two outputs for X and Y axis. The myDAQ its eslf I conected over an USB to my laptop. Unfortanly I get signal noise. If I using only the batarry of my laptop for the powersuply, the nois become smaller.

 

Than I connected it to an extern powersuply (the myDAQ) and the signal becom much smoother.

 

Why is it so? What are the reasons?

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