Suitable for high and low voltage switch contact (loop) resistance, cable line DC resistance value of high precision measurement, also suitable for other need large current, micro resistance measurement occasions.
Note:
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At present, the conventional QJ44 double-arm DC bridge is widely used in power system to measure contact resistance, but the testing current of this kind of bridge is only mA level, so it is difficult to find the defect of reducing the cross-sectional area of the loop conductor. When measuring the contact resistance of the conductive circuit of the high voltage switch, due to the influence of the oil film and oxide layer between the contacts, the measured value is several times too large to truly reflect the contact resistance value. To this end, the latest Ministry of Power standard DL/T845.4 -- 2004 "resistance measuring device general technical conditions: Circuit Resistance Tester and the new version of Verification regulation JJG1052-2009 "Circuit Resistance Tester and Direct Resistance Tester Verification Regulation" stipulate that the measuring current of contact resistance such as switch (isolation) and circuit breaker shall not be less than 100A DC and the minimum current maintenance time shall not be less than 60S to ensure the accuracy of test results.
The instrument operating panel adopts ergonomic design, in line with operating habits, the use of high frequency switching power supply and digital circuit technology, suitable for the measurement of switching control equipment circuit resistance. The test current is 100A DC recommended by the national standard. The circuit resistance can be measured directly under the DC 100A condition, the test results are displayed with a large screen LCD, and has data storage, output printing, time setting and other functions, and another 50A gear for users to choose; Is the only domestic can reach 0.01μΩ resolution and very stable contact resistance tester, performance more than imported large current micrometer. Meet the requirements of high voltage switch maintenance and circuit resistance test in power and power supply departments.
Product nickname：Contact resistance tester,Switching loop resistance tester,Contact loop resistance tester,Contact (loop) resistance tester,High Precision Micro Ohmmeter
| Measuring range | 0～2999.9μΩ |
| Resolution | 0～99.99，0.01μΩ ; 100.0～2999.9，0.1μΩ |
| Test current | DC50A, 100A two-speed fixed output |
| measurement accuracy | ±(0.5% rd+2d) |
| Continuous working time | 5s～599s |
| Display method | Large screen Chinese LCD display |
| communication mode | U disk dump |
| Working power | AC220V±10% 50Hz |
| Total power | 600W |
| Maximum storage record | 200 |
| working environment | temperature-10℃～40℃，humidity：≤80%RH |
| Dimensions | 360×300×250 mm3 |
| Weight | 8kg(No attachments) |
1. The appearance of the product is subject to the actual product. The Technical Parameters and model numbers are subject to change without notice. If there is misappropriation or copying, legal liability will be pursued.
2. For more information about Wuhan UHV, please enter product center . Service email：info@hvtest.cc
1. High current: It adopts new switching power supply technology, which can continuously output large current for a long time, overcomes the shortcomings of the instantaneous current of pulsed power supply, can effectively penetrate the switch contact oxide film and obtain good test results.
2, high stability: under severe interference conditions, the last data of the LCD screen can be stable within ±1 word range, the reading is stable and the repeatability is good.
3, high precision: using dual high-speed 16-bit Σ-Δ AD sampling, digital signal processing technology, the highest resolution reaches 0.01μΩ, is currently a very stable contact resistance tester with a resolution of 0.01μΩ in China, the performance exceeds Imported high current micro-ohmmeter.
4. Intelligent: High-performance CPU of the port. When measuring, the system automatically switches the range according to the signal size to ensure the test accuracy. The over-temperature protection circuit can automatically stop the output current when the instrument exceeds the set temperature to ensure the safe use of the instrument.
5. High quality: All key components are imported components. The ingeniously designed temperature compensation circuit effectively eliminates the influence of ambient temperature on the measurement results. The use of military connectors enhances the anti-vibration performance.
6. Powerful function: The current is freely selected in 50A and 100A. The test time is set arbitrarily within 5s~599s. Overcoming the defects that other similar instruments cannot set the measurement time or the continuous working time is too short, far exceeds the other similar instruments. performance.
7. Friendly man-machine interface: Rotate the mouse to input data, which is convenient and quick. Set the date and time of the instrument independently, save the measurement data in real time, and print the measurement result in real time.
8. USB transfer: The measurement data is transferred to the U disk through the USB interface, and the measurement data is further analyzed and processed in combination with the host computer software.
9, easy to use: small size, light weight, easy to carry.
Enterprise products in strict accordance with international and national standards and rules of industry production, through the national, provincial and municipal electric power research institute and electric power authorities detection, measuring center, fully passed the ISO9001 international quality management system certification, the licence for manufacturing measuring instruments of the People's Republic of China, GB/T19001-2016 quality management system requirements, GB/T24001-2016 environmental management system requirements, GB/T45001-2020 occupational health and safety management system requirements.
email： info@hvtest.cc
Skype： Tina Qiao
+8615172408058
