Thiết bị đo điện trở đất, điện trở xuất Kyoritsu 4140 Loop Impedance Function L-PE ATT OFF L-PE ATT ON L-N / L-L Rated Voltage 230V (50/60Hz) L-N: 230V (50/60Hz) L-L: 400V (50/60Hz) Operating Voltage 100~280V (45~65Hz) 100~500V (45~65Hz) Range (Auto-Ranging) 20/200/2000Ω 20/200/2000Ω (L-N<20Ω) 20Ω Nominal Test Current at 0Ω External Loop: Magnitude/Duration at 230V 20Ω: 6A/40ms 200Ω: 2A/20ms 2000Ω: 15mA/500ms L-N: 6A/60ms N-PE: 10mA/approx.5s 20Ω: 6A/20ms Accuracy ±3%rdg±4dgt (*1) ±3%rdg±6dgt (*1) L-N: ±3%rdg±4dgt L-L: ±3%rdg±8dgt PFC (L-PE) / PSC (L-N / L-L) (*2) Function PFC PFC (ATT) PSC Rated Voltage 230V (50/60Hz) L-N: 230V (50/60Hz) L-L: 400V (50/60Hz) Operating Voltage 100~280V (45~65Hz) 100~500V (45~65Hz) Range (Auto-Ranging) 2000A/20kA 2000A/20kA (L-N<20Ω) 2000A/20kA Nominal Test Current at 0Ω External Loop: Magnitude/Duration at 230V 20Ω: 6A/40ms 200Ω: 2A/20ms 2000Ω: 15mA/500ms L-N: 6A/60ms N-PE: 10mA/approx.5s 20Ω: 6A/20ms Phase Rotation Operating Voltage 50~500V, 45~65Hz Remarks Correct phase sequence: displayed "1.2.3" and mark Reversed phase sequence: displayed "3.2.1" and mark