DSO138 showing 50 Hz signal even witout connections

DSO138 showing 50 Hz signal even witout connections

Postby luto65 » Fri Nov 15, 2019 2:18 pm

Dear All,
my DSO138 is powered by a 9V transformer that stabilise 50Hz the 220 AC current and delivers 9V DC.
When I connect the provided probe to the DSO138, then I can observe a clear 50Hz signal in the display even without attaching the probe to anything.
Is this "normal" ?
luto65
 
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