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Earth Clamp Tester

 


KEW4202
 
Product CatalogueInstruction Manual
 



Various useful functions are available on Android devices using Bluetooth communication



Free Android software "KEW smart 4202"
is available on "Google Play Store" (*)

  • Supporting Android ver. 2.2 - 4.0
  • WVGA (800 × 480) resolution or higher




(*)Please search "KEW Smart" in Google Play Store.
Communication charge may be incurred separately to download application.
Real time measurements can be transferred, shown and saved on Android device (up to 100 measurements)
Saved data includes measurement, GPS location and date & time
Easy to check on map "When" and "Where" the measurement was made
Comparator function on Android device informs when the measured value is lower/higher than the preset value

4202
CE


Earth /Ground resistance and Leakage current measurement functions
The earth resistance from 0.05 to 1200 Ω can be measured without the auxiliary earth spikes in multi-earthing systems
True RMS leakage or phase current readings from 0.1mA to 30.0A provides vital additional information in earthing networks
Filter function offers increased immunity to electrical noise and a Noise mark appears in excessively high noisy environments


NEWTRUE RMSÆ32DATA HOLDAUTO POWER OFFBacklightBluetooth®
  
 


FunctionRangeResolutionMeasuring RangeAccuracy
Earth resistance
Auto range
20Ω0.01Ω (*)0.00~20.99Ω
|±1.5%±0.05Ω
200Ω0.1Ω16.0~99.9Ω
|±2%±0.5Ω
100.0~209.9Ω
|±3%±2Ω
1200Ω160~399Ω
|±5%±5Ω
400~599Ω
|±10%±10Ω
10Ω600~1260Ω---
AC current
(50Hz/60Hz)
Auto range
100mA0.1mA0.0~104.9mA
|±2%±0.7mA
1000mA1mA80~1049mA
|±2%
10A0.01A0.80~10.49A
30A0.1A8.0~31.5A
Operating indication

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 time per second
Power sourceLR6/R6 (AA) (1.5V) × 4
Current consumptionApprox. 90mA (max. 140mA)
Measurement timeApprox. 21 hours (when LR6 is used)
Approx. 5 hours (when R6 is used)
Auto power-offTurns power off about 10 minutes after the last button operation
Applicable standardsIEC 61010-1 CAT.IV 300V Pollution degree 2
IEC 61010-2-032, IEC 61326-2-2 (EMC)
Withstand voltageAC 5320Vrms/5 seconds
Between the Transformer jaws fitted parts and case enclosure (except for jaws)
Conductor sizeApprox. φ32mm
Dimension246 (L)×120 (W)×54 (D) mm
WeightApprox. 780g (including batteries)
Accessories
8304 (Resistors for operation check)
9167 (Carrying case [Hard])
LR6 (AA) × 4, Instruction manual


• 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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HẾT HẠN

0466 844 722
Mã số : 6526384
Địa điểm : Hà Nội
Hình thức : Cần bán
Tình trạng : Hàng mới
Hết hạn : 28/12/2020
Loại tin :

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