Hero999
Banned
To answer the original question: where to get a 3A source?
I would connect a mains transformer to a variac with a power resistor across its terminals.
I would measure the voltage across the resistor as the primary voltage is adjusted and work out the current using Ohm's law. Of course this isn't an ideal solution because the current will vary as the mains voltage fluctuates but it should be good enough to test a current transformer.
I would connect a mains transformer to a variac with a power resistor across its terminals.
I would measure the voltage across the resistor as the primary voltage is adjusted and work out the current using Ohm's law. Of course this isn't an ideal solution because the current will vary as the mains voltage fluctuates but it should be good enough to test a current transformer.