# Noise on my oscilloscope when probing a wire

I am prototyping a NTC voltage divider circuit and I am having trouble with noise on my probe. It seems like I am constantly getting a large amount of noise (200-300mv) on my oscilloscope waveform even when all I am doing is probing a small wire. 200-300 mV is a lot isn't it? I feel like I can't really gauge the actually noisiness of an analog signal if my oscilloscope always has this minimum 200mV p2p noise on it.

Where is this noise coming from, and what can I do to remove it?

EDIT: Here are some more picture of the calibrating probe: Zoomed in:

There seems to be a constant 50mV p2p noise signal when calibrating...

• When was the last time you calibrated your oscope? – KingDuken Jan 16 at 19:32
• That's a nice antenna you've built in your second picture ;) – marcelm Jan 16 at 19:33
• It's been a very long time since I've calibrated my oscilloscope. Could that be the issue? – Alex C Jan 16 at 19:36
• @marcelm The noise happens even if I probe a line on my breadboard. It's like it doesn't even matter what I am probing. – Alex C Jan 16 at 19:37
• You've made a loop antenna out of your probe in the picture, as @marcelm points out. You're picking up ambient radio noise. – Hearth Jan 16 at 19:42

2. If your oscilloscope can change the bandwidth (e.g., from 100MHz down to 20MHz) is the magnitude of the noise the same? Is the noise reduced by more than $$\\sqrt{5}\$$?