Kyoritsu KEW 4105DL EARTH TESTER
The Kyoritsu KEW 4105DL is a rugged, handheld digital earth tester designed to assess ground resistance and earth voltage in a variety of settings. Housed in an IP67-rated, dust- and waterproof enclosure, it withstands harsh outdoor environments and can be washed clean after muddy field use. Six AA cells power the unit, and an automatic power-off feature conserves battery life when idle.
Internally, the tester employs the fall-of-potential method: it injects a stable AC current between the earth electrode under test and a remote spike, then measures the resulting voltage drop to calculate resistance. A large backlit LCD displays true-RMS voltage (AC/DC auto-detect) up to 300 V and earth resistance from 0.00 Ω to 2099 Ω, with clear over-range and warning indicators.
Ergonomically shaped for two-hand operation, the KEW 4105DL features a rotary range switch, a dedicated TEST button with LED feedback, and status LEDs for spike integrity and high earth-voltage warnings. The KEW 4105DLBT variant adds Bluetooth® (v5.0) for remote monitoring via the free “KEW Smart” app, enabling data logging and location tagging on tablets.
Features:
- Meets IEC 61010-1, IEC 61010-2-030 CAT II 300 V / CAT III 150 V / CAT IV 100 V, Pollution degree 3 and IEC 61557-1, -5 safety standards.
- Dust- and waterproof to IP67 (washable).
- Backlit LCD with auto-off after 2 min; auto-power-off after 10 min of inactivity.
- Shoulder-strap design for hands-free operation.
- AC/DC earth-voltage measurement with auto-detect and high-voltage warning LED.
- Three-range earth-resistance measurement (0 Ω–2000 Ω) with auxiliary‐spike check LED.
- Built-in comparator function to flag values exceeding user thresholds.
- Bluetooth® communication (KEW 4105DLBT only) for remote monitoring and data saving.
Specifications:
| Category | Details |
|---|---|
| Earth Voltage: | 0–300 VAC (45–65 Hz) / ±0–300 VDC; True RMS; ±1% rdg ± 4 dgt |
| Earth Resistance: | 0.00–20.99 Ω (20 Ω) 0.0–209.9 Ω (200 Ω) 0–2099 Ω (2000 Ω) ±1.5% rdg ± 0.08 Ω/±4 dgt |
| Auxiliary Spike Limits: | 20 Ω range ≤ 10 kΩ; 200 Ω range ≤ 50 kΩ; 2000 Ω range ≤ 100 kΩ |
| Safety Standards: | IEC 61010-1, -2-030, -031; IEC 61557-1, -5; IEC 60529 IP67; IEC 61326-1, -2-2; EN 50581 |
| Power: | Six × AA alkaline (LR6); auto-power-off; backlight auto-off |
| Display & Interface: | Backlit LCD; rotary range switch; TEST & backlight buttons; status LEDs |
| Dimensions & Weight: | 121 × 188 × 59 mm; approx. 690 g (incl. batteries & lid) |
| Bluetooth (DLBT only): | Bluetooth v5.0; remote monitoring & data logging via “KEW Smart” app |
Applications:
- Earth Resistance Measurement for Power Distribution Lines.
- Ground Testing of In-House Wiring Systems.
- Verification of Electrical Appliance Grounding.
Measurement of the earth electrode resistance (3-Pole method):
Measurement of the simplified earth resistance (2-Pole method):
Earth voltage warning:
| Frequency | Voltage |
|---|---|
| 0 to 10Hz | > 10V |
| 10 to 100Hz | >25V |
| 100 to 400Hz | >5V |
Package Contents:
- 1x Test leads for precision measurement (MODEL 7266): Red 20 m, Yellow 10 m, Green 5 m
- 1x Test leads for simplified measurement (MODEL 7127B): with 2 protective finger guards
- 1x Auxiliary earth spike (MODEL 8041): 2 spikes
- 1x Cable reel (MODEL 7267 or 7268): 20 m red or 10 m yellow, supplied per model
- 1x Shoulder strap (MODEL 9121)
- 6x AA alkaline batteries (LR6)
- 1x Instruction manual
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