KEW 4106 - Earth Resistance & Resistivity Tester

  • High test current up to 80mA yielding resolution of 0.001? on 2? 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.
FunctionRangeResolutionMeasuring rangeAccuracy
Earth resistance
(Rg at
? measurement)
2? 0.001? 0.03 - 2.099? ±2%rdg±0.03?
20? 0.01? 0.03 - 20.99? ±2%rdg±5dgt (*1)
200? 0.1? 0.3 - 209.9?
2000? 1? 3 - 2099?
20k? 10? 0.03k - 20.99k?
200k? 100? 0.3k - 209.9k?
Auxiliary earth resistance
Rh, Rs
8% of Re+Rh+Rs
Earth resistivity
2? 0.1?·mm - 1?·m
0.2 - 395.6?·m ?=2×?×a×Rg (*2)
20? 0.2 - 3956?·m
200? 20 - 39.56k?·m
2000? 0.2 - 395.6k?·m
20k? 2.0 - 1999k?·m
Series interference voltage
Ust (A.C only) (*3)
50V 0.1V 0 - 50.9Vrms ±2%rdg±2dgt (50/60Hz)
±3%rdg±2dgt (40 - 500Hz)
Autoranging 0.1Hz
40Hz - 500Hz ±1%rdg±2dgt
Measuring method Earth resistance: Fall-of-potential method
(currents and voltages measured via the Probes)
Measurement method of Earth Resistivity (?): Wenner 4-pole method
Series interference voltage (earth voltage)
RMS Rectifier (between the E-S Terminals)
Memory capacity 800 data
Communication Interface Model 8212-USB Optical Adaptor
LCD Dot-matrix 192×64 monochrome
Over-range Indication "OL"
Overload Protection between E-S(P) and between E-H(C) terminals AC280V / 10 sec.
Applicable standards IEC 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 source DC12V : sizeAA manganese dry battery (R6) × 8
(Auto power off: approx. 5 minutes)
Dimensions 167(L) × 185(W) × 89(D) mm
Weight approx. 900g (including batteries)
Accessories 7229A (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
Optional 8212-RS232C (RS232C adaptor with "KEW Report(Software)")

Test Leads

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