2205A Noise Floor in Scope View

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Michael_Faraday
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Joined: Fri Jul 16, 2021 5:19 pm

2205A Noise Floor in Scope View

Post by Michael_Faraday »

The noise floor is in range according to the specs, but I am wondering what these spikes are caused by. Do they actually exist or are they phantom? They occur randomly yet regularly.

Both channels have 50 ohm terminators connected and nothing else. I managed to get a beautiful waveform of AC noise on a SMPS, and the scope and software appear to be functioning properly otherwise.
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2205A Noise Floor.png

Gerry
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Re: 2205A Noise Floor in Scope View

Post by Gerry »

Hi Michael,

I apologise for the long delay in answering, I have been tied up with other work, so I haven't been able to answer forum posts for quite a while.

The spikes are just random components of larger noise voltages, (they look large because you have zoomed in to a noise waveform on the smallest input range). Noise is a randomized voltage, so what would be more unusual is if there were no spikes and the noise looked exactly the same from the beginning to the end of the capture.

Regards,

Gerry
Gerry
Technical Specialist

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