Earth Clamp Tester

Pre-Order Earth Clamp Tester
The earth resistance from 0.05 to 1500Ω can be measured without the auxiliary earth spikes. (The Multiple Earthing System.) • True RMS Accurate true RMS readings of AC current including distorted waveform from 1mA to 30.0A • Noise Check Function A function to detect current, which effects on an earth resistance measurement and display "NOISE" mark on the LCD. • Memory function Save and display up to 100 measurement data. • Data hold function / Buzzer function / Back light function • Compliant with Safety Standards of IEC 61010-1 : CAT.IV 300V Pollution degree2 Note: A single earthing can not be measured. (Only for Multiple Earthing System) TRUE RMS
FunctionRangeResolutionMeasuring rangeAccuracy
Earth resistance Auto range20Ω0.01Ω*0.00~20.99Ω|±1.5%±0.05Ω
AC current
(50Hz / 60Hz)
Auto range
Operating system
Earth resistance function :Constant voltage injection,
Current detection, 
(Frequency : Approx.2400Hz)
Dual Integration
AC current function :Successive Approximation
Over-range indication"OL" is displayed when input exceeds the upper limit of a measuring range
Response timeApprox.7 seconds (Earth resistance)
Approx.2 seconds (AC current)
Sample rateApprox. 1 times per second
Power sourceDC6V : R6P (sizeAA manganese battery) × 4pcs,
or LR6 (sizeAA alkaline battery) × 4pcs
Current consumptionApprox. 50mA (max. 100mA)
Measurement timeApprox. 12 hours (when R6P is used)
Approx. 24 hours (when LR6 is used)
Auto power-offTurns power off about 10 minutes after the last button operation.
Applicable standardsIEC 61010-1 : 2001 (CAT.IV 300V Pollution degree2)
Withstand voltageAC5320Vrms / 5 seconds
Between the Transformer jaws fitted parts and Case enclosure
(except for jaws)
Conductor sizeApprox. 32mm max.
Dimension246(L) × 120(W) × 54(D)mm
WeightApprox. 780g (including batteries)
AccessoriesBattery R6P (AA) × 4, Instruction manual
8304 (Resister for operation check)
9166 (Hard case)
•Crest factor < 3 (50Hz / 60Hz, peak value shall not exceed 60A)
*4 counts or less are corrected to 0.
Why earth resistance can be found by only clamping it?

Rx, is defined as earth resistance under test, and R1, R2...Rn are defined as earth resistance of other measuring objects.
These earth resistances, R1, R2, Rn can be considered that they are connected in parallel.
And they can be regarded as a combined resistance Rs. The Rs can be regarded small enough against Rx since a combined resistance consists of several resistances. Following is an equivalent circuit diagram of this circuit.

Voltage V is applied to the object (Resistance Rx) measured from the voltage injection transformer CT1, and the current I corresponding to the earth resistance is flowed.
The current I is detected with detection transformer CT2, and object (Resistance Rx) measured can be put out by the calculation. (refer to the right diagram)

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  • Product Code: Kyoritsu 4200
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