KYORITSU KEW 4300 Simplified Earth Testers
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 work‐light 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 Ω range; ≈0.7 mA at 825 Hz on the 2000 Ω 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 Ω. 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.
Features:
- 2-pole earth resistance tester using existing electrodes (fall-of-potential).
- Auto-ranging: 200 Ω / 2000 Ω.
- Small test current (max 2 mA) avoids tripping ELBs.
- Warning buzzer for readings ≤ 100 Ω.
- Live-circuit warning LED at ≥ 30 V.
- Automatic LED work-light with ambient sensor.
- Backlight auto-off (≈2 min); auto-power-off (≈10 min).
- Glow-in-the-dark TEST button for low-light use.
- Protective finger-guard for safety.
- User-replaceable metal tips (3 types).
Specifications:
| Parameter | Details |
|---|---|
| Earth Resistance: | 0.0–209.9 Ω (200 Ω range); 160–2099 Ω (2000 Ω range); ±3% rdg ± 5 dgt (200 Ω) |
| Earth Voltage: | AC 5–300 V RMS (45–65 Hz), DC ±5–300 V; ±1% rdg ± 4 dgt (AC), ±1% rdg ± 8 dgt (DC) |
| Measurement Current: | ~1.4 mA @825 Hz (200 Ω); ~0.7 mA @825 Hz (2000 Ω) |
| 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) |
Applications:
- Earth Resistance Testing of Distribution Lines.
- Earth Resistance Testing of In-House Wiring Systems.
- Earth Resistance Testing of Electrical Appliances.
Package Contents:
- 1x MODEL 7248 precision test leads (alligator clip + flat test bar)
- 1x Banana plug (both ends, black)
- 1x Alligator clip
- 1x Flat test bar
- Metal tips for H+S(C+P) terminal:
- 1x MODEL 8072 (standard)
- 1x MODEL 8253 (molded)
- 1x MODEL 8017 (long type)
- 1x Carrying case
- 1x Strap
- 2x AA alkaline batteries
- 1x Instruction manual
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