... voltage channels and current channels. DF-301 three-phase meter takes single chip as kernel, adopts three separate ... seven functions: voltmeter, ammeter, phase meter, phase sequence meter, frequency counter, power meter, power factor meter.2. Display vector figures with six angles. ... .01V.current:0.5, resolution 1mA.power factor:1%±2 characterpower:2.03. Input Impedance :1MΩ 4. Working Conditions: ...