I know that there are plenty of ways to measure AC voltage without breaking the circuit but is there a way to block AC voltage in the same way?
Why do you have to break the circuit to measure voltage? Do you mean current?I know that there are plenty of ways to measure AC voltage without breaking the circuit but is there a way to block AC voltage in the same way?
Thanks. Is there a way to induce this magnetic field? For e.g. Is it possible to turn an appliance connected to main on and off using a contactless magnetic inducing device?With magnetic shielding.
The current flow and therfore the magnetic field around an AC conductor is always changing.
Varying magnetic fields induce current flow in conductive materials. Blocking the magnetic field will block the inductive effect of AC current.
Exactly. You dont have to break the circuit to measure either. Most clamp meters measure current and quite a few good meters today have the NCV method to measure AC voltage.Why do you have to break the circuit to measure voltage? Do you mean current?
My DMM also has a clamp-on ammeter that has a 300ma and a 10a scale AC or DC.To measure current with a DMM you do have to break the circuit and insert the meter. You are not going to measure dc milliamps with a clamp on meter...
http://sensing.honeywell.com/products/current-sensors?Ne=2308&N=3027Thanks. Is there a way to induce this magnetic field? For e.g. Is it possible to turn an appliance connected to main on and off using a contactless magnetic inducing device?
You can also get an optoelectronic triac as a switch. I don't know what you consider non-contact but, the first unit (opto-isolated Triac) has a DC circuit with an IR LED emitter (a few milliamps) not connected to your AC voltage. The illumination of the IR LED will trigger the TRIAC. Triacs that can handle hundreds of AC volts are available - I don't know your current handling needs.Thanks. Is there a way to induce this magnetic field? For e.g. Is it possible to turn an appliance connected to main on and off using a contactless magnetic inducing device?
Exactly. You dont have to break the circuit to measure either. Most clamp meters measure current and quite a few good meters today have the NCV method to measure AC voltage.
There's an interesting article on page 73.
My DMM also has a clamp-on ammeter that has a 300ma and a 10a scale AC or DC.To measure current with a DMM you do have to break the circuit and insert the meter. You are not going to measure dc milliamps with a clamp on meter...
I know that there are plenty of ways to measure AC voltage without breaking the circuit but is there a way to block AC voltage in the same way?