Quote:
Originally Posted by Penthode
A super old scope will provide a clearer trace on the basis of lower bandwidth. A lo pass filter feeding the scope should ameliorate the noise.
The other causes of noise are bad grounds, lack of proper shield and electromagnetic/ electrostatic noise in the environment. A test to determine the noise in the environment is to simply remove the scope probe see how much the hanging probe noise is. Then touch the probe hot lead with your finger.
With the probe disconnected and the sensitivity set to 0.1v/div anda x10 probe, I see a 3vp-p sinusoid when I touch the hot lead. when nothing is connected to the probe at the same vertical sensitivity of 0.1/div, I see a straight line.
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OK guys...thank you so much. I'm off to teach tonight so I won't be back on this until tomorrow. I think we're getting close.