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4hv.org :: Forums :: Tesla Coils

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Oscilloscope trouble

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LAN_403

Russell Haley

Mon Nov 23 2009, 08:29AM

Registered Member #2478 Joined: Mon Nov 23 2009, 03:24AM
Location: Texas A&M University
Posts: 47

My scope was inherited from my grandfather, and it didn't have any ground clips, nor are the probes constructed in such a way as to suggest that ground clips are necessary. Until I ran across a reference to ground leads, I was using differential measurements for everything. Thus the 2 channel scope was a 1 channel scope, and I just lived with the noise that arose from the probe leads taking different paths to the front panel.

Since I discovered the source of the problem, I've been clipping alligator test leads between the exposed shield on the scope probes and circuit ground. It's still a kludge, but it works. Perhaps I should buy some cheap ebay scope probes.

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