Kyoritsu Indonesia - Earth Clamp Tester KEW 4202


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Earth Clamp Tester

KEW

4202

 
Product Catalogue Instruction 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

NEW TRUE RMS φ32 DATA HOLD AUTO POWER OFF Backlight Bluetooth®
   
 
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 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 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 time Approx. 7 seconds (Earth resistance)
Approx. 2 seconds (AC current)
Sample rate Approx. 1 time per second
Power source LR6/R6 (AA) (1.5V) × 4
Current consumption Approx. 90mA (max. 140mA)
Measurement time Approx. 21 hours (when LR6 is used)
Approx. 5 hours (when R6 is used)
Auto power-off Turns power off about 10 minutes after the last button operation
Applicable standards IEC 61010-1 CAT.IV 300V Pollution degree 2
IEC 61010-2-032, IEC 61326-2-2 (EMC)
Withstand voltage AC 5320Vrms/5 seconds
Between the Transformer jaws fitted parts and case enclosure (except for jaws)
Conductor size Approx. φ32mm
Dimension 246 (L)×120 (W)×54 (D) mm
Weight Approx. 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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