KYORITSU KEW 4200 True RMS Earth Clamp Tester

KEW 4200 True RMS Earth Clamp Tester

SKU:KEW 4200 (126)

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Regular Price: $1,500.00 (USD)
On Sale For: $1,300.00 (USD)

•	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 61010-1 : 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

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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

Over-range 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 power-off

Turns power off about 10 minutes after the last button operation.

Applicable standards

IEC 61010-1 : 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 : 4pcs Instruction manual : 1pc
8304 (Resister for operation check : 1pc)
9128 (Hard case : 1pc)

•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)