Earth Resistance Tester Kyoritsu 4106
• 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.

Earth resistance
Re
( Rg at
Á measurement) ( Function) 2© 20© 200© 2000© 20k© 200k© ( Range) 0.001© 0.01© 0.1© 1© 10© 100© ( Resolution) 0.03~ 2.099© 0.03~ 20.99© 0.3~ 209.9© 3~ 2099© 0.03~ 20.99k© 3~ 209.9k© ( Measuring range) ± 2% rdg± 0.03©
± 2% rdg± 5dgt ( * 1) ( Accuracy)
Auxiliary earth resistance
Rh, Rs : 8% of Re+ Rh+ Rs ( Accuracy)
Earth resistivity
Á : 2© 20© 200© 2000© 20k© 200k© ( Range) 0.1© • m~ 1© • m
Autoranging ( Resolution) 0.2~ 395.6© • m 0.2~ 3956© • m 20~ 39.56k© • m 0.2~ 395.6k© • m 2.0~ 1999k© • m ( Measuring range) Á = 2× À × a× Rg ( * 2) ( Accuracy)
Series interference voltage
Ust ( A.C only) ( * 3) : 50V ( Range) 0.1V ( Resolution) 0~ 50.9Vrms ( Measuring range) ± 2% rdg± 2dgt ( 50/ 60Hz)
± 3% rdg± 2dgt ( 40~ 500Hz) ( Accuracy)
Frequency
Fst : Autoranging ( Range) 0.1Hz 1Hz ( Resolution) 40Hz~ 500Hz ( Measuring range) ± 1% rdg± 2dgt ( Accuracy)
Measuring method : Earth resistance: Fall-of-potential method ( currents and voltages measured via the Probes)
Measurement method of Earth Resistivity ( Á ) : 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.
Withstand voltage : between the electrical circuit and enclosure AC3540V( 50/ 60Hz) / 5 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 ( R6P) × 8
( Auto power off: approx. 5 minutes)
Dimensions : 167( L) × 185( W) × 89( D) mm
Weight : approx. 900g ( including batteries)
Accessories : 7229 ( Precision measurement test leads) ,
7238 ( 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) ,
R6P× 8, Instruction manual, Calibration certificate
Optional : 8212-RS232C ( RS232C adaptor with " KEW Report( Software) " )

( * 1) Auxiliary earth resistance is 100© with Rk correction

( * 2) Depending on the measured Rg. Interval [ a] between auxiliary earth spikes is 1.0~ 30.0m

( * 3) This instrument is NOT designed to measure line voltages on commercial powers