Nominal Current(RMS):200/400/800/1000/1200/2000A Vout@Ipn:+_4.000V Measuring Range:0~+_4000A Supply Voltage DC:+-12-15V Accurancy@Ipn,+25degree Celsius:less than +_1.0% Mounting(mm):40.5 in diameter * Open- loop * Supply voltage: DC +-12~15V * Capable measurement of currents: DC, AC,pulse with galvanic isolation between primary circuit and secondary circuit.