Hi,
I am having some difficulty in my lab with noise on the AC mains. It is showing up in my lab power supplies (both linear). A lot of it is coming from a PLC (power line communications) unit, but even with that removed the noise is quite bad. Does anybody have any filtering recommendations for filtering PLC noise?
I did some online searching and found a company called Onfilter (
https://www.onfilter.com/power-line-communication) who claim to have a solution to the very problem of PLC; however their solution costs quite a bit ($500US plus shipping for 10A version). Does anybody have experience with their products?
I see that there are many input filter solutions available on Digikey etc, but they all seem to filter at 100kHz and up, and I'm not sure if this is going to work for my situation as they seem aimed at EMI. I see there are 1, 2, and 3 stage filters, and they range in cost from about $25CAD and up.
Single stage filter ~$25CAD
https://www.digikey.ca/en/products/detail/te-connectivity-corcom-filters/6-6609959-6/759090Three stage filter ~$100CAD
https://www.digikey.ca/en/products/detail/10VN1/CCM1649-ND/361444?itemSeq=349223681There is also line conditioners by Tripp Lite and other similar brands. I tried a simple line conditioner by Monster (Power Center HT800) that has a filter on the input. It showed some attenuation on the signal, but not too much - making me leery to think some of these other solutions will be much more successful. I'm guessing the Monster device has a single stage filter similar to the one for $25 above, but I'd like to know what is in the TrippLite devices. Reading their data sheets doesn't give much information about this kind of stuff (says 75dB of attenuation, but no chart or other info). I guess I'm just not sure if it will be attenuating the right frequencies.
Attached is a snapshot of the noise coming out of one of my linear power supplies (Rigol DP832). I put a 1k resistor across the output at 5V to make the measurement.
Any help would be appreciated.
Thanks!