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CÔNG TY CỔ PHẦN THƯƠNG MẠI
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SẢN XUẤT SƠN THỊNH
Trụ sở chính: Số 10, dãy F10 TTĐH Bách Khoa, P.Bách Khoa, Q. Hai Bà Trưng, HN
VPGD :104 K18 TTĐH Bách Khoa, Nguyễn Hiền, Hai Bà Trưng, Hà Nội
PHÂN PHỐI CÁC THIẾT BỊ ĐO KYORITSU/JAPAN
| Mọi Sản phẩm Bảo hành 12 tháng với đầy đủ giấy tờ xuất xứ nguồn gốc ( CO, CQ ) Vui lòng liên hệ trực tiếp để có giá tốt nhất
Phòng kinh doanh: Mr. Bình 04.66.844.722-0983.974.562 mail : kinhdoanh3@vnautomation.com Hoặc
kd3.sonthinh@gmail.com yahoo : Schneider.sonthinh |
| Earth Clamp Tester |
| 4202 |
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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 | |
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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 |
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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 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 |
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| • Crest factor < 3 (50Hz / 60Hz, peak value shall not exceed 60A) (*) 4 counts or less are corrected to 0. |
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| | 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.
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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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