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KEW 4106

  • Earth Resistance & Resistivity Tester
    High test current up to 80mA yielding resolution of 0.001Ω on 2Ω range.
  • Advanced Filtering method (based on FFT Fast Fourier Transform) reduces noise interference for obtaining stable measurements.
  • Automatic and Manual selection of the Test Current Frequency in four bands (94/105/111/128Hz). In Automatic mode, KEW 4106 will select the most suitable Frequency.
  • Several sub-results can be shown on the display: Resistance of the Auxiliary Earth Spikes, Frequency of Test Current, Voltage and Frequency of Interference (noise), Residual Resistance Rk, etc.
  • Warning for excessive noise and high Auxiliary Earth Spikes resistance.
  • Large Graphic Display with backlight for readings in poorly illuminated areas.
  • Up to 800 measurement results can be saved in the memory and recalled on the display.
  • The stored results can be transferred to a PC using the “KEW Report” software and a USB adaptor (Model 8212-USB) which are included.
  • Robust design with IP54 protection.


  • Backlight
FunctionRangeResolutionMeasuring rangeAccuracy
Earth resistance
(Rg at
ρ measurement)
0.001Ω0.03 – 2.099Ω±2%rdg±0.03Ω
20Ω0.01Ω0.03 – 20.99Ω±2%rdg±5dgt (*1)
200Ω0.1Ω0.3 – 209.9Ω
2000Ω3 – 2099Ω
20kΩ10Ω0.03k – 20.99kΩ
200kΩ100Ω0.3k – 209.9kΩ
Auxiliary earth resistance
Rh, Rs
8% of Re+Rh+Rs
Earth resistivity
0.1Ω·mm – 1Ω·m
0.2 – 395.6Ω·mρ=2×π×a×Rg (*2)
20Ω0.2 – 3956Ω·m
200Ω20 – 39.56kΩ·m
2000Ω0.2 – 395.6kΩ·m
20kΩ2.0 – 1999kΩ·m
Series interference voltage
Ust (A.C only) (*3)
50V0.1V0 – 50.9Vrms±2%rdg±2dgt (50/60Hz)
±3%rdg±2dgt (40 – 500Hz)
40Hz – 500Hz±1%rdg±2dgt
Measuring methodEarth resistance: Fall-of-potential method
(currents and voltages measured via the Probes)
Measurement method of Earth Resistivity (ρ): Wenner 4-pole method
Series interference voltage (earth voltage)
RMS Rectifier (between the E-S Terminals)
Memory capacity800 data
Communication InterfaceModel 8212-USB Optical Adaptor
LCDDot-matrix 192×64 monochrome
Over-range Indication“OL”
Overload Protectionbetween E-S(P) and between E-H(C) terminals AC280V / 10 sec.
Applicable standardsIEC 61010-1 CAT III 300V, CAT IV 150V Pollution degree 2
IEC 61010-031, IEC 61557-1, 5, IEC 61326-1 (EMC), IEC 60529 (IP54)
Power sourceDC12V : sizeAA manganese dry battery (R6) × 8
(Auto power off: approx. 5 minutes)
Dimensions167(L) × 185(W) × 89(D) mm
Weightapprox. 900g (including batteries)
Accessories7229A (Earth precision measurement),
7238A (Simplified measurement test leads),
8032 (Auxiliary earth spikes [2 spiks/set])×2 sets (4 spikes in total),
8200-04 (Cord reel [4 pcs])×1 set,
8212-USB (USB adaptor with “KEW Report(Software)”),
9121 (Shoulder strap),
9125 (Carrying case),
R6 × 8, Instruction manual, Calibration certificate
Optional8212-RS232C (RS232C adaptor with “KEW Report(Software)”)

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