This is a very incomplete query, since you even do not specify what is your DUT and the scope inputs are not visible. From what I can see there is no "peak" at all and the dominant feature is not noise either. It is an oscillating signal with a fluctuating amplitude and a frequency of exactly 50 Hz. Hence my guess is that you have connected nothing to the input, leaving it open-ended and set to a high impedance. In which case the inputs are inductively picking up the mains from the environment whose amplitude would indeed vary upon any environmental variation (such as you moving parts of your own body in the vicinity of the scope). Considering the frequency, I deduce that you live i a country with 50 Hz mains (not in Europe). Whichever the case, you seem to be a newbee in electronics, so never mind my words and WELCOME :-)
@Stan Sykora
Sir,you are absolutely correct about the mains frequency as I am from India.Yes I am a newbie exploring these devices.DUT is a energy harvesting device. I am extremely glad for your guidance in this regard.
Dear Anupam Chowdhury , I agree with Stan Sykora .
May be your confusion is because sometimes the power line fundamental frequency, i.e. 50Hz or 60Hz is considered a mains "noise", or electric"noise", which is a humming sound associated with alternating current at the frequency of the mains electricity.
Regards!
Thanks a lot for your invaluable insights @ Prof. Martin & Prof Stan
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