How can I tap off a High Voltage, High Speed Electrical Signal?

Question

I have an industrial panel which I believe uses 200-240v, (i've only got pictures). I need to tap of a semi-clean signal which comes through a sensor, I believe this is also cleaned at the panel. I've thought of using a optocoupler to tap of the signal but the highest detection voltage i've seen is 24V. I am also a little worried about using a relay due to the fact that its very high speed and a Relay might be a little noisy.

Answer 1

i think your best bet is to use a small isolation transformer.

a 240V-to-12V would work fine. I would further recommend a center-tapped xfmr..like 12V-0V-12V. This arrangement could get U a zero-crossing signal, a 1/2 wave rectified signal, an AC signal, or a DC signal. The "isolation" part is the part U should be concened with for safety. TonyB

Answer 2

If you want to sense current through the wire, you could coil a wire around it, and then apply the ends to an op-amp circuit. The output of the op-amp will respond to the voltage induced on the coil of wire, which is induced by the current flowing through the wire. This would be the safest way, because you are isolated from the 200V circuit.

Answer 3

If you have to ask the question here where a number of people under 12 hang out, I'd recommend you find a real live person there who knows what they are doing just for personal safety.

Answer 4

Try tranformer.

Answer 5

You wont live long.