Loop Resistance Tester with Communication:
It is designed by combining high-frequency switching power supply technology and digital circuit technology. It is suitable for measuring the loop resistance of switch control equipment. The test current adopts the DC 100A recommended by production standards. The loop resistance can be directly measured under DC 100A, and the test results are displayed on a large-screen LCD, with functions such as data storage, output printing, and time setting. There is also a 50A gear for user selection. It is a device for measuring contact resistance and
loop resistance of switch control equipment. The test current adopts the 100A DC recommended by production standard GB763. This loop resistance tester can directly measure the loop resistance or contact resistance under 100A current, and display it directly. It can also save up to 100 groups of data on the instrument, and the saved data can be uploaded to a computer via the RS232 interface. This switch loop resistance tester has accurate measurement and stable performance, meeting the requirements of on-site high-voltage switch maintenance in power and power supply departments and loop resistance testing in high-voltage switch factories.
Product Features:
1.High Current: Using switching power supply technology, it can continuously output high current for a long time, overcoming the drawbacks of instantaneous current in pulse power supplies, effectively breaking down the oxide film on switch contacts and achieving good test results.
2. High Stability: Under severe interference conditions, the last digit of the LCD can remain stable within ±1 digit, with stable readings and good repeatability.
3、High Precision: Using dual high-speed 16-bit Σ－Δ AD sampling and new digital signal processing technology, the resolution reaches 0.01μΩ, making it the contact resistance tester that can achieve 0.01μΩ resolution and is very stable in China, with performance exceeding imported high-current micro-ohmmeters.
4、Intelligent: Using an imported high-performance CPU, the system automatically switches ranges based on signal strength during measurement, ensuring the accuracy of the product. The over-temperature protection circuit can automatically stop output current when the instrument exceeds the set temperature, ensuring safe use.
5、High Quality: All key components are imported, and the cleverly designed temperature compensation circuit effectively eliminates the influence of ambient temperature on measurement results. The use of connectors enhances vibration resistance.
6、Powerful Functions: The current can be freely selected between 50A and 100A, and the test time can be set arbitrarily from 5s to 599s, overcoming the shortcomings of other similar instruments that cannot set measurement time or have too short continuous working time, far exceeding the performance of other similar instruments.
7、User-Friendly Interface: Data input via a rotary mouse is convenient and fast, allowing users to set the instrument date and time, save measurement data in real-time, and print measurement results immediately.
8、Multiple Communication Methods: It can communicate with a computer via RS232 serial port (9-pin) or USB data cable, uploading measurement data to the computer for further analysis and processing by test personnel.
9、Easy to Use: Small size, light weight, and easy to carry.
Performance Characteristics:
The test current is large, fully meeting national standards for contact resistance testing.
High output voltage and wide measurement range, up to 100mΩ.
The test current comes from a high-precision 100A switching constant current power supply, requiring no manual adjustment, and the test is fast and accurate.
Using the four-terminal connection method, effectively eliminating the influence of test lead resistance on test results.
Fast test speed, displaying data in about 3 seconds.
Long-term continuous operation, equipped with overheat protection circuit, the instrument is reliable and stable.
Simple operation, light weight, suitable for field work.
The instrument has a perpetual calendar and 99 groups of data storage, and data is not lost when powered off. It also has a "U disk" interface for easy export to generate tables on a computer.
This instrument is equipped with an RS485 communication interface, which, together with the host computer control software, enables remote control measurement.
Technical Specifications:
1、Test Current: 50A, 100A
2、Range: 50A gear 0～100 mΩ
100A gear 0～ 50 mΩ
3、Minimum Resolution: 0.01μΩ
4、Accuracy: 0.5%±0.2μΩ
5、Output Voltage: DC10V
6、Working Mode: 100A, 50A continuous
7、Power Supply: AC220V±10％ 50Hz
8、Power Consumption: ≤1000W
9、Operating Temperature: -20℃～40℃
10、Relative Humidity: ≤80%, no condensation
11、Weight: 8.5kg
12、Dimensions: 360mm×235mm×270mm
