- #1
gareth
- 189
- 0
Hi,
I am using a simple circuit in the lab which detects current flow from an ion source. These are transient signals recorded at a rate of 100Hz. The problem is, the ion source is switching at the same freqeuncy at very high voltages. Needless to say there is a fair bit of 100Hz EMI. So every time I want to record one of these ion bursts I have to record a burst of noise also.
Here is what I'v done;
The signal is carried through coaxial cables, the shielding being ground. I have insulated the outside of the wires with copper tape which has helped immensly, but as soon as I plug in the voltage supply to the circuit (this is needed for the experiment) I get a big wack of noise again at 100Hz.
So is there an easy way of blocking out this noise? I've being messing around with tin foil and sheetes of metal but have not had great success.
Any experience here?
Many thanks
Gareth
I am using a simple circuit in the lab which detects current flow from an ion source. These are transient signals recorded at a rate of 100Hz. The problem is, the ion source is switching at the same freqeuncy at very high voltages. Needless to say there is a fair bit of 100Hz EMI. So every time I want to record one of these ion bursts I have to record a burst of noise also.
Here is what I'v done;
The signal is carried through coaxial cables, the shielding being ground. I have insulated the outside of the wires with copper tape which has helped immensly, but as soon as I plug in the voltage supply to the circuit (this is needed for the experiment) I get a big wack of noise again at 100Hz.
So is there an easy way of blocking out this noise? I've being messing around with tin foil and sheetes of metal but have not had great success.
Any experience here?
Many thanks
Gareth