# Help to find nature of noise gotten from digital oscilloscope

+ 3 like - 0 dislike
432 views

I've got strange noise while using digital oscilloscope (Auris B-424). Spectrogram of this signal presented on this image. (X time in seconds, Y frequency in Hertz) Zoomed versions: 1, 2 On oscillogram noise looks like impulse interference with amplitude approximately 10 milliVolts.

Simple scheme (fiber semiconductor detector) is connected to the input of oscilloscope with short 50 Om coaxial cable. Without anything on input channel noise is significantly lower (10-15 times), although still presented. Surge protector and ground used for powering oscilloscope and notebook. My main guess is impulse interference from notebook and oscilloscope itself, but I can't find way to deal with it.

What do you think? What nature has this noise and is there any way to reduce it?

UPD: Full data set if somebody will need it (first column is time and second is voltage): http://www.filedropper.com/noise_1

 Please use answers only to (at least partly) answer questions. To comment, discuss, or ask for clarification, leave a comment instead. To mask links under text, please type your text, highlight it, and click the "link" button. You can then enter your link URL. Please consult the FAQ for as to how to format your post. This is the answer box; if you want to write a comment instead, please use the 'add comment' button. Live preview (may slow down editor)   Preview Your name to display (optional): Email me at this address if my answer is selected or commented on: Privacy: Your email address will only be used for sending these notifications. Anti-spam verification: If you are a human please identify the position of the character covered by the symbol $\varnothing$ in the following word:p$\hbar$ys$\varnothing$csOverflowThen drag the red bullet below over the corresponding character of our banner. When you drop it there, the bullet changes to green (on slow internet connections after a few seconds). To avoid this verification in future, please log in or register.