High-Precision Loop Resistance Tester

I. Product Overview

Currently, conventional methods are widely used in the power system.QJ44Type double-arm DC bridge measures contact resistance, while the test current of such bridges is onlymAIt is difficult to detect the defect of reduced cross-sectional area in the loop conductors. When measuring the contact resistance of the conductive circuit of high-voltage switches, the measurement values are several times larger due to the influence of the oil film and oxidation layer between the contacts, failing to truly reflect the actual contact resistance value. In response to this, the Ministry of Power has established standards.SD301—88Communication500kVThe "Procedures for Power Equipment Handover and Preventive Testing" and the new edition of the "Procedures for Preventive Testing of Power Equipment" specify that the measuring current for the contact resistance of circuit breakers and disconnecting switches shall not be less than direct current.100ARegulations are in place to ensure the accuracy of the test results.

ED0303B-600The High-Precision Circuit Resistance Tester is designed in accordance with the new electric power execution standards of the People's Republic of China.DL/T845.4-

2004The product is designed by combining high-frequency switching power supply technology with digital circuit technology. It is suitable for measuring the circuit resistance of switching control equipment. Its test current adopts the recommended DC standard by the national standard authority.100ANo Chinese content provided.200ANo Chinese content provided.100A、200AIn the case, the loop resistance was directly measured, and the subsequent test results were displayed on a large LCD screen.LCDThe display features, along with data storage, output printing, and time settings functionalities. Additionally,50A、150AUsers can choose from various gear settings. The instrument offers precise measurements and stable performance, meeting the requirements of on-site high-voltage switch maintenance for power and supply departments, as well as circuit resistance testing at high-voltage switch factories.

Use

High-precision measurements for high-voltage switch contact (circuit) resistance, also suitable for other applications requiring large current and micro-resistance measurements.

III. Performance Features

(1)High Current Output: Utilizing new switching power supply technology, it can continuously output high current over extended periods, overcoming the drawbacks of instantaneous current in pulse-type power supplies. This effectively pierces the oxidation film on the switch contacts, yielding favorable test results.

(2)High Stability: Under severe interference conditions, the data behind the liquid crystal screen can remain stable at ±1Within a certain range, the readings are stable and have good repeatability.

(3)High Precision: Dual High-Speed Route Adopted16We are proud to introduce the new Σ-Δ.ADSampling, new digital signal processing technology, high resolution achieved0.01μΩ is currently the only domestic.No content provided for translation.0.01A highly stable contact resistance tester with μΩ resolution, outperforming imported high current micro-ohmmeters in performance.

(4)Intelligentization: Utilizing imported high-performanceCPUThe system automatically switches ranges based on signal size during measurement, ensuring the accuracy of the product's testing. The over-temperature protection circuit automatically stops outputting current when the instrument exceeds the set temperature, ensuring safe operation of the instrument.

(5)High Quality: All key components are imported, and the impact of ambient temperature on measurement results is effectively eliminated by a cleverly designed temperature compensation circuit. The use of military-grade connectors enhances vibration resistance.

(6)Powerful Functionality: Current can50A，100A，150A，200APlease select freely; the testing time can be5s~599sOur product overcomes the shortcomings of other similar instruments, which cannot be set for measurement time or have a too short continuous working time, far surpassing the performance of other similar instruments.

(7)User-friendly Human-Machine Interface: Data input via mouse rotation is convenient and quick, allowing for self-setting of instrument date and time, real-time saving of measurement data, and immediate printing of results.

(8)Multiple Communication Methods: Accessible viaRS232Serial Port(9Needle)OrUSBThe data cable communicates with the computer, uploading measurement data for further analysis and processing by the test personnel.

(9)Convenient to Use: Compact and lightweight for easy portability.