ZWHR-100C Contact Resistance Tester

• High stability, high precision.
• Friendly human-machine interface.
• Easy to use: small size, light weight, easy to carry.
• USB transfer.

Company Profile

The company specializes in the research anddevelopment, production, sales, and service of electric power systemautomation testing equipment, providing customers with one-stopservices.

Product Introduction

At present, the conventional QJ44 double-arm DC bridge is commonly used in power systems to measure contact resistance. However, the test current of this type of bridge is only mA level, making it difficult to find the defect of reduced cross-sectional area of the loop conductor. When measuring the contact resistance of the high-voltage switch conductive circuit, due to the influence of the oil film and oxide layer between the contacts, the measured value is several times larger and cannot truly reflect the contact resistance value. To this end, the latest Ministry of Electric Power standard DL/T845.4-2004 “General Technical Conditions for Resistance Measuring Devices: Loop Resistance Tester” and the new version of the calibration regulations JJG1052-2009 “Calibration Regulations for Loop Resistance Testers and Direct Resistance Meters” make measurements ( The measurement current of contact resistance of isolation switches, circuit breakers, etc. shall not be less than DC 100A, and the minimum current maintenance time shall not be less than 60S to ensure accurate test results.It complies with the requirements of on-site high-voltage switch maintenance and high-voltage switch factory loop resistance testing of electric power and power supply departments.

Functional Characteristics

1. Large current: Using the latest switching power supply technology, it can continuously output large current for a long time, overcoming the shortcomings of instantaneous current of pulse power supply, and can effectively break down the oxide film of switch contacts and obtain good test results.
2. High stability: Under severe interference conditions, the last digit of data on the LCD screen can be stable within the range of ±1 word, with stable readings and good repeatability.
3. High precision: Using dual-channel high-speed 16-bit Σ-Δ AD sampling and the latest digital signal processing technology, the highest resolution reaches 0.01μΩ. It is currently the only contact resistance tester in China that can reach 0.01μΩ resolution and is very stable. The performance exceeds that of imported high-current microohmmeter.
4. Intelligent: Imported high-performance CPU, the system automatically switches the range according to the signal size during measurement to ensure 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. The cleverly designed temperature compensation circuit effectively eliminates the impact of ambient temperature on the measurement results. The use of military connectors enhances the anti-vibration performance.
6. Powerful function: Freely choose between 50A and 100A current flow, and the test time can be set arbitrarily between 5s and 599s, overcoming the shortcomings of other similar instruments that cannot set the measurement time or the continuous working time is too short, far exceeding that of other similar instruments. performance.
7. Friendly human-machine interface: Rotate the mouse to input data, which is convenient and fast. You can set the instrument date and time independently, save the measurement data in real time, and print the measurement results instantly.
8. USB transfer: Transfer the measurement data to a USB flash drive through the USB interface, and combine it with the host computer software to further analyze and process the measurement data.
9. Easy to use: small size, light weight, easy to carry.

Technical Parameter

Product Detail