How to use LEM LAH 50-P current transducer
The LEM device requires a dual polarity power supply. You need to supply +15V with to the +Uc terminal with the 0V terminal connected to the power supply common terminal. You need to supply -15V to the -Uc terminal. Connect the power line as you described. The current in Rm will have the same waveform as the power line current but reduced in amplitude by a factor of 2000. You can use as input to your sampling circuit, the voltage across that resistor, that you must supply.