Industry standard DL/T 845.4-2004 "Technical conditions for resistance measuring devices - Part 4: Loop resistance tester"

Suitable for high-precision measurement of high and low voltage switch contact (circuit) resistance and cable line DC resistance values, and also applicable to other occasions that require high current and micro resistance measurement. The instrument operation panel adopts ergonomic design, conforms to operating habits, uses high-frequency switching power supply and digital circuit technology, and is suitable for measuring the circuit resistance of switch control equipment. The test current adopts the national standard recommended DC 100A. The circuit resistance can be directly measured under DC 100A, and the test results are displayed on a large LCD screen with functions such as data storage, output printing, and time setting. There is also a 50A gear for users to choose from; It is the only contact resistance tester in China that can achieve a resolution of 0.01 μ Ω and is very stable, with performance exceeding that of imported high current micro ohmmeters. Meets the requirements of on-site high-voltage switch maintenance and high-voltage switch factory circuit resistance testing by the power and supply departments.

FEATURES

1. High current: Adopting the latest switching power supply technology, it can continuously output high current for a long time, overcoming the drawbacks of instantaneous current in pulse power supplies. It can effectively penetrate the oxide film of switch contacts and obtain good test results.

2. High stability: Under severe interference conditions, the last digit of the LCD screen can remain stable within ± 1 word range, with stable readings and good repeatability.

3. High precision: Adopting dual channel high-speed 16 bit ∑ - Δ AD sampling and the latest digital signal processing technology, the highest resolution reaches 0.01 μ Ω, making it the only contact resistance tester in China that can achieve 0.01 μ Ω resolution and is very stable. Its performance exceeds that of imported high current micro ohmmeters.

4. Intelligence: Imported high-performance CPU, the system automatically switches the range according to the signal size during measurement to ensure testing accuracy. The over temperature protection circuit can automatically stop outputting current when the instrument exceeds the set temperature, ensuring the safe use of the instrument.

5. High quality: All key components are imported, and the cleverly designed temperature compensation circuit effectively eliminates the influence of environmental temperature on measurement results. The use of military connectors enhances the anti vibration performance.

6. Powerful function: Choose freely between 50A and 100A current, with testing time available in fast, 10 seconds, 30 seconds, and 60 seconds, far exceeding the performance of other similar instruments.

7. User friendly interface: Touch screen control, convenient and fast, self setting instrument date and time, real-time saving of measurement data, and instant printing of measurement results.

8. USB Transfer: Transfer measurement data to a USB flash drive through a USB interface, and further analyze and process the measurement data in conjunction with the upper computer software.

9. Easy to use: small size, light weight, easy to carry.

Technical Parameter

1. Measurement range: 0-2999.9 μ Ω

2. Resolution: 0-99.99 0.01 μ Ω

3.100.0～2999.9  0.1μΩ

4. Test current: Four fixed outputs of DC50A, 100A, 150A, 200A

5. Measurement accuracy: ± (0.5% rd+2d)

6. Continuous working time: 5s~599s