The BOHL intelligent circuit resistance tester is a specialized device used for measuring contact resistance and circuit resistance of switch control equipment. The test current adopts the 100A DC recommended by the national standard GB763, which can directly measure the circuit resistance or contact resistance at 100A, 200A, 300A, 400A, 500A or 600A current, and display it directly. It can also be saved to the instrument, and the saved data can be uploaded to the computer through the RS232 interface This instrument measures accurately and has stable performance, suitable for on-site maintenance of high-voltage switches in power and supply departments, as well as testing of circuit resistance in high-voltage switch factories

Loop Resistance Tester, Loop Contact Resistance Tester, Digital Loop Resistance Tester, High Voltage Loop Resistance Tester, Contact Resistance Tester

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: Using imported high-performance CPUs, the system automatically switches the measurement range according to the signal size during measurement, ensuring the accuracy of the product's testing 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: The current can be freely selected from 50A, 100A, 150A, 200A, and the testing time can be set arbitrarily within 5s~599s, overcoming the shortcomings of other similar instruments that cannot set measurement time or have short continuous working time, far exceeding the performance of other similar instruments

7. Human computer interface friendly: By rotating the mouse to input data, it is convenient and fast. The instrument date and time can be set independently, measurement data can be saved in real time, and measurement results can be printed in real time

8. Multiple communication methods: Able to communicate with the computer through RS232 serial port (9-pin) or USB data cable, and upload measurement data to the computer for further analysis and processing by testing personnel

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

1. Measurement range: 0~2999.9 μ Ω

2. Resolution: 0~99.99, 0.01 μ Ω; 100.0~2999.9, 0.1 μ Ω

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

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

5. Continuous working time: 5s~599s

6. Display mode: Large screen Chinese LCD display

7. Communication method: USB or RS232 serial port

8. Working power supply: AC220V ± 10% 50Hz

9. Whole machine power: 1200W

10. Maximum storage record: 200 records

11. Working environment: Temperature -10 ℃~40 ℃ Humidity ≤ 80% RH

12. Volume: 380 × 300 × 260 mm3

13. Weight: 8kg (excluding accessories)

Working principle

The intelligent circuit resistance tester adopts the principle of current voltage method testing, also known as four wire method testing technology. The current source supplies the measured resistor Rx current through the "I+" and "I -" ports (also known as I-type ports). The magnitude of the current is read out by the ammeter I. The voltage drop at both ends of Rx is taken out from the "V+" and "V -" ports (also known as V-type ports) and read out by the voltmeter V By measuring I and V, the resistance value of the measured resistor can be calculated