Hello.
We're dealing with the HV (High Voltage) gas discharge thus electrical grounding is crucial issue for devices personal safety. I've done many effort to make good grounding but still have devices malfunctioning during discharge sometimes.
I thought it is probably due to that the lab is on 2nd floor thus ground wire to earth is several tens of meter, seems too long. Thus I'm thinking about to put copper plate of large size on the lab floor and this is connected to earth via ground wire. And devices in our labs especially discharge system are to be connected to this plate. Although this plate is floated to earth during short time of dischage (several hundreds of ns) the plate itself may gives equipotential in our lab..
Do you think this is good idea?
Thanks people. Actually I'm sure that there is a lot of EMI such as RF wave. It is already observed with Oscilloscope with BNC cable simply floated in air! In this case, I have some question for Aniculaesei. Could you tell me your previous discharge condition such as what kind of gas was discharged, peak discharge current and its rising time, etc. Maybe I can compare our case to your case.
25 kV discharge voltage is similar for but we're using hydrogen and discharge current is about more than 200 A at peak with rising time of 120 ns. It appears to be that our case is much more strong than your case thus EMI disturbance should be much more. We've also have transformer only for discharge but not much different. Maybe some disturbance propagates to other devices through connected ground such as shield of the BNC cable which is connected to discharge device. Did you use ferrite bead or toroid (It might be also called choke)? Was it really working to filter out high frequency noise like several to several hundreds MHz range?
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