Quote:
Originally Posted by bandersen
I'm concerned about the trace on your scope being fuzzy.
What do you have your volt/div set at?
It should be very sharp and defined. I've never measured the level of the signal I'm putting into a set. I just use the lowest signal that gives me a clear trace.
Even on a super basic, old scope, you should get a clear trace.
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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.