


Earth Clamp Tester 

4200 




• 
The earth resistance from 0.05 to 1200Ω 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 610101 : CAT.IV 300V Pollution degree2 

Note: A single earthing can not be measured. (Only for Multiple Earthing System) 







Function 
Range 
Resolution 
Measuring range 
Accuracy 
Earth resistance Auto range 
20Ω 
0.01Ω* 
0.00~20.99Ω 
±1.5%±0.05Ω 
200Ω 
0.1Ω 
16.0~99.9Ω 
±2%±0.5Ω 
100.0~209.9Ω 
±3%±2Ω 
1200Ω 
1Ω 
160~399Ω 
±5%±5Ω 
400~599Ω 
±10%±10Ω 
10Ω 
600~1260Ω 
 
AC current (50Hz / 60Hz) Auto range 
100mA 
0.1mA 
0.0~104.9mA 
±2%±0.7mA 
1000mA 
1mA 
80~1049mA 
±2% 
10A 
0.01A 
0.80~10.49A 
30A 
0.1A 
8.0~31.5A 
Operating system 
Earth resistance function : 
Constant voltage injection, Current detection, (Frequency : Approx.2400Hz) Dual Integration 
AC current function : 
Successive Approximation 

Overrange indication 
"OL" is displayed when input exceeds the upper limit of a measuring range 
Response time 
Approx.7 seconds (Earth resistance) Approx.2 seconds (AC current) 
Sample rate 
Approx. 1 times per second 
Power source 
DC6V : R6P (sizeAA manganese battery) × 4pcs, or LR6 (sizeAA alkaline battery) × 4pcs 
Current consumption 
Approx. 50mA (max. 100mA) 
Measurement time 
Approx. 12 hours (when R6P is used) Approx. 24 hours (when LR6 is used) 
Auto poweroff 
Turns power off about 10 minutes after the last button operation. 
Applicable standards 
IEC 610101 : 2001 (CAT.IV 300V Pollution degree2) 
Withstand voltage 
AC5320Vrms / 5 seconds Between the Transformer jaws fitted parts and Case enclosure (except for jaws) 
Conductor size 
Approx. 32mm max. 
Dimension 
246(L) × 120(W) × 54(D)mm 
Weight 
Approx. 780g (including batteries) 
Accessories 
Battery 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) 



