KYORITSU KEW 4106 Earth Resistance & Resistivity Tester (Made In THAILAND)
The KYORITSU KEW 4106 Earth Resistance & Resistivity Tester (Made In THAILAND is a hand-held digital instrument engineered for precise measurement of earth resistance and soil resistivity. Housed in a rugged, IP54-rated case, it integrates a microcomputer to automate complex calculations, enabling fast and reliable readings even in electrically noisy environments. Its dot-matrix LCD with backlight ensures clear visibility of results in low-light or dusty conditions.
Equipped with versatile wiring options, the KEW 4106 supports 2-, 3-, and 4-wire fall-of-potential resistance tests, as well as Wenner 4-pole resistivity measurements. Users can select or auto-select one of four test frequencies (94 Hz, 105 Hz, 111 Hz, 128 Hz) to minimize interference, while the built-in FFT-based filtering stabilizes readings under challenging site conditions..
Data management is streamlined: up to 800 results can be stored and later transferred to a PC via the supplied USB optical adapter and KEW Report software. Additional conveniences include residual-lead resistance nulling, automatic power-off, battery-voltage check, and alerted warnings for high auxiliary-spike resistance or earth-voltage interference.
Features:
- Meets IEC 61010-1, IEC 61010-2-030 (CAT III 300 V/CAT IV 150 V) and related safety standards.
- FFT-based filtering for stable measurements in noisy environments.
- Dot-matrix 192×64 monochrome LCD with backlight.
- Manual/automatic selection of four test frequencies (94/105/111/128 Hz).
- Rk function to cancel residual test-lead resistance.
- Battery check and low-battery warning.
- Series interference-voltage and frequency measurement.
- Auxiliary earth-resistance measurement and warning.
- Auto-power-off after 5 min of inactivity.
- Memory for 800 measurements with PC transfer via optical adapter.
Specifications:
| Function | Range | Resolution | Measuring Range | Accuracy |
|---|---|---|---|---|
| Earth Resistance (Re): | 2 Ω | 0.001 Ω | 0.030 – 2.099 Ω | ±2% rdg ± 0.03 Ω |
| 20 Ω | 0.01 Ω | 0.03 – 20.99 Ω | ±2% rdg ± 5 dgt | |
| 200 Ω | 0.1 Ω | 0.3 – 209.9 Ω | ||
| 2 kΩ | 1 Ω | 3 – 2099 Ω | ||
| 20 kΩ | 10 Ω | 0.03 – 20.99 kΩ | ||
| 200 kΩ | 100 Ω | 0.3 – 209.9 kΩ | ||
| Auxiliary Earth Resistance (Rh, Rs): | — | — | 8% of (Re + Rh + Rs) | |
| Earth Resistivity (ρ): | Auto-ranging | — | 0.2 – 395.6 Ω·m | ρ = 2·π·a·Rg |
| Series Interference Voltage (Ust): | 50 V | 0.1 V | 0 – 50.9 V rms | ±2% rdg ± 2 dgt (50/60 Hz) |
| ±3% rdg ± 2 dgt (40–500 Hz) | ||||
| Frequency (Fst): | Auto-ranging | 0.1/1 Hz | 40 – 499.9 Hz | ±1% rdg ± 2 dgt |
| Memory Capacity: | — | — | 800 data | — |
| Power Source: | DC 12 V (8×AA manganese) | — | — | — |
| Dimensions (L×W×D): | 167 × 185 × 89 mm | — | — | — |
| Weight: | Approx. 900 g | — | — | — |
| Communication Interface: | USB (Optical Adaptor) | — | — | — |
| Applicable Standards: | IEC 61010-1/-2-030/-031, IEC 61557-1,5, EMC, IP54 | — | — | — |
Applications:
- Soil surveys to optimize earth-electrode design.
- Geological investigations.
Package Contents:
- 4x Earth resistance test leads (Model 7229A) (red 40 m; yellow, black, green 20 m each)
- 1x Simplified measurement test leads (Model 7238A)
- 4x Auxiliary earth spikes (Model 8032) (2 spikes per set × 2 sets)
- 4x Cord reels (Model 8200-04)
- 1x USB optical adapter (Model 8212-USB)
- 2x Fuses (Model 8923, 0.5 A/600 V): 1 installed + 1 spare
- 1x Shoulder strap (Model 9121)
- 1x Carrying case (Model 9125)
- 8x AA manganese batteries (R6P)
- 1x Instruction manual
