HI, Just moved and set our extracellular field recording rig in a different (older) building. My goodness, I have so much noise! I have attached grounding wires to all components (chamber bath, interface chamber, each headstage) and the noise is beyond terrible. I am using new chemicals, same type of medical grade 95% O2/5% CO2 that I used in my old building, same faraday cage, same headstages and electronics...
I'm wondering if I really have not "grounded" my devices properly? I was always taught to install a metal screw into my anti-vibration table base and attached ground wires there. Should it be something else? That is what I did at my old building and even though we sometimes had noise issues, it's nothing like this.
I've attached a picture of what my experiment looked like.
For reference: Using Axon CNS 1440A Digidata, AM-Systems 1800 Amplifiers and headstages, AM Systems model 2200 Stimulus Isolators, Formvar-coated Nichrome wires for stimulating electrodes...
This signal can be cleaned from the high frequency noise superimposed on it by an average filtering. You need to sample this signal with the proper sampling frequency and then you can apply the sample on a sliding average filter. Such filter tool kit is associated with the mat lab.
You can use also analog low pass filter to filter out the high frequency ripples. You can use Butter worth filter. You can vary the cut off frequency and the order of the filter till you clean this signal.
With the signal processing tool kit in the mat lab there is no problem with with such type of noise.
I would like also that you see the attached paper in the link: Article Long-Term Potentiation by Theta-Burst Stimulation Using Extr...
Best wishes
In my understanding, a lot of large buildings have multiple grounds, wherein ground loops are able to develop. A dedicated ground circuit with single ground to earth might be worth exploring (good electricians would know how to install them).
- Badges
- Science topic
- Similar topics
- Geoscience
- Asia
- India