DSO138 showing 50 Hz signal even witout connections

Post Reply
luto65
Posts: 4
Joined: Thu Nov 14, 2019 9:48 pm

DSO138 showing 50 Hz signal even witout connections

Post by luto65 »

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" ?
Post Reply