Hi all,

After reading the benefit of an oscilloscope, i took one that is not used in
my work to debug (is this used in hardware too ?) a pic circuit. I have ZERO
experience with scopes, so, and i attach the probe to Ch1, the probe has a
clip, i grip it to gnd and the pin of the probe to what was i really want to
measure... BUT, i have a 50Hz superimposed over my signal, and showme not
really what i expect, then measuring the line ac make some spark in the
probe (the scope can accept 400 vac). Using a tester, and the scope off, i
discover that the clip is connected to the line ground (0 ohm), and i
suppose that the test probe was isolated from the main line. I'm wrong and i
must go to buy "measuring with a scope for newbies" or the scope is bad?, i
don't have none to ask in my work, because is not used and is there only by
a mistake

The scope is a tektronix tds-310, and the probes (both with the same result)
P6109B 10X

( BTW, 50 Hz is the line frequency here )

Thanks in advance

RVP.

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