What is the proper way of setting up an oscilloscope?

Hello there!

I have an Instek GDS-2202 digital storage oscilloscope. I am trying to
figure out how to setup my scope to minimize the pick up of stray 60Hz
mains signal. If I change my scope's vertical sensitivity to 20mV/div,
then I can see the 60Hz signal. The signal's amplitude increases even
more when I turn on my DC power supply. I can pick this signal up
without even connecting the probes to anything.

Should I connect the oscilloscope to another outlet instead of putting
it in the same surge protector? How do I minimize the 60Hz pickup?

Also, I have a programmable signal generator that is pretty accurate. I
put out a 1 kHz sine wave test signal with a low amplitude (about 200
mV), and it seems like I have some display issues. On a Tektronix
scope, this signal looks pretty stable. But on my GDS-2202 the signal
drifts a lot, so instead of seeing one sine wave, I see a non-inverted
and inverted sine wave on top of each other.

I am new to this and would like to learn from you about the proper way
of setting up instrumentation equipment.


Thanks!

.

Relevant Pages

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