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At present conventional QJ44 type double-arm DC bridges are commonly used in power systems to measure contact resistance and the test current of such bridges is only mA level and it is difficult to find defects in reducing the cross-sectional area of the loop conductor. When measuring the contact resistance of the high-voltage switch conductive loop the measured value is several times larger due to the influence of the oil film and the oxide layer between the contacts and the contact resistance value cannot be truly reflected. To this end the Ministry of Power standard DL/T845.4-2004 "General technical requirements for resistance measuring devices: loop resistance tester" and the new version of the verification procedures JJG1052-2009 "loop resistance tester straight resistance test procedures" made measurement (isolated The measuring current of the contact resistance of switches circuit breakers etc. is not less than DC 100A and the minimum current maintenance time is not less than 60S ensuring accurate test results.
The High Precision Micro Ohmmeter operator panel is ergonomically designed to meet operational habits and uses high frequency switching power supplies and digital circuit technology for the measurement of loop resistance in switch control equipment. The test current is DC 100A recommended by the national standard. The loop resistance can be directly measured under the condition of DC 100A. The test result is displayed by large-screen LCD LCD and has functions of data storage output printing time setting etc. and 50A gear position for users to choose; custom test time maximum The set time is 599S which is much larger than the standard 60S. It is a very stable contact resistance tester with a resolution of 0.01μΩ in China. The performance exceeds the imported high current micro-ohmmeter. It meets the requirements of on-site high-voltage switch maintenance and high-voltage switch factory loop resistance test in electric power and power supply departments.
Product nickname：Contact resistance testerSwitching loop resistance testerContact loop resistance testerContact (loop) resistance testerHigh 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. 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.
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