The KYORITSU KEW 4300 is a handheld, simplified earth resistance tester designed for quick, two-pole measurements using existing earth electrodes (e.g. buried water pipes or building lightning rods). Its compact body houses a rotary range switch and an integral LED worklight that automatically adapts to ambient brightness, making it ideal for field use in dimly lit areas.
Employing a constant-current fall-of-potential method, the tester injects a small AC current (1.4 mA at 825 Hz on the 200 range; 0.7 mA at 825 Hz on the 2000 range) between the H(C) and E terminals, then measures the voltage drop to calculate Rx + re. The result earth resistance plus any existing earth electrode resistance is displayed instantly; deduct any known re to obtain true Rx.
Built to withstand indoor environments up to 2000 m altitude, the KEW 4300 features a protective finger-guard, glow-in-the-dark TEST button, and a warning buzzer that sounds below 100 . Its backlit LCD auto-shuts after 2 minutes, and the instrument powers off after 10 minutes of inactivity, preserving two AA alkaline cells. A live-circuit LED warns if line voltage exceeds 30 V during resistance measurement.
| Parameter | Details |
|---|---|
| Earth Resistance: | 0.0209.9 (200 range); 1602099 (2000 range); 3% rdg 5 dgt (200 ) |
| Earth Voltage: | AC 5300 V RMS (4565 Hz), DC 5300 V; 1% rdg 4 dgt (AC), 1% rdg 8 dgt (DC) |
| Measurement Current: | ~1.4 mA @825 Hz (200 ); ~0.7 mA @825 Hz (2000 ) |
| Work-light & Display: | LED work-light + backlit LCD; auto-off after 2 min |
| Safety Standards: | IEC 61010-1 CAT III 300 V; IEC 61557-1,-5; Pollution degree 2; IP40 |
| Operating Temp/Humidity: | 10 C to 50 C; 80% RH (no condensation) |
| Storage Temp/Humidity: | 20 C to 60 C; 75% RH (no condensation) |
| Power: | 2 AA alkaline batteries; auto-power-off after 10 min |
| Dimensions & Weight: | 232 51 42 mm; approx. 220 g (incl. batteries) |
IM_4300_92-2081A_E_L
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