Electronics > Beginners
Scope and Pk-Pk Values 1x vs 10x
schratterulrich:
For measurements on the power supply a simple and effective way is to use a coax cable instead of a probe. This is possible due to the low impedance of the power supply. A short GND connection (shield of caoax) is essential.
You will get less noise with this method.
For very low frequency measurements you can use the standard 1 Meg input impedance of the scope. With AC coupling you can optimize the vertical setting to see the ripple in more detail. With AC coupling you will see frequencies down to about 10 Hz I think.
For high frequency measurements you have to use a 50 Ohm termination at the scope input. Be aware to not overload the 50 Ohm termination. If your scope has an internal 50 Ohm termination you can use AC coupling. Then your lower frequency limit is about 200 kHz. (At least with my scope)
Dreded:
just in case anyone runs across this post... dave did a video all about this.. its common mode noise.
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