Introduction
The UHV-H200P features an ergonomically designed operating panel, ensuring intuitive and comfortable use in line with common operator habits. It employs high-frequency switching power supply and advanced digital circuit
technology, making it suitable for measuring the circuit resistance of switching control equipment. The instrument supports the nationally recommended DC test current of 100A, enabling direct and accurate circuit resistance
measurement under this condition. Test results are clearly displayed on a large LCD screen, with additional functionalities including data storage, printing output, time setting, and an optional 50A test range for user flexibility.
As the only domestically produced contact resistance tester capable of achieving a 0.01μΩ resolution with high stability, its performance surpasses that of imported high-current micro-ohmmeters. The device fully meets the
requirements for high-voltage switch maintenance and circuit resistance testing in power and electrical supply applications.
Main function
Core Testing Function
Precisely measures DC resistance at the micro-ohm (μΩ) level. Typical test objects include the moving/stationary contacts of high-voltage circuit breakers, disconnecting switch contacts, busbar crimping joints, cable connectors, and solder joints.
Safety Protection Features
Equipped with over-temperature protection, over-current protection, and fault alarm functions.
Prevents equipment damage caused by prolonged high-current output, enhancing operational safety.
High-Precision Loop Resistance Measurement
Capable of measuring loop resistance at the micro-ohm (μΩ) level.
Resolution typically reaches 0.01 μΩ, making it suitable for high-precision contact resistance testing.
Application scenarios
High-voltage circuit breakers: Measuring the contact resistance of their conductive loop is a key indicator for determining whether the contacts are worn, eroded, or have poor contact.
Disconnecting switches and load switches: Detecting whether the contacts are in good condition to prevent heating faults caused by excessively high contact resistance.
High- and low-voltage switchgear: Performing periodic preventive tests on the main circuit, busbar connections, and other points within the switchgear.
Paramètres techniques
| Plage de mesure | 50A 0～10mΩ |
| 100A 0～5mΩ | |
| 150A 0～3.333mΩ | |
| 200A 0～2.500mΩ | |
| Résolution | 0～99.99μΩ, 0.01μΩ |
| 100.0～10000.0μΩ，0.1μΩ | |
| Courant d'essai | Sortie fixe à quatre vitesses DC 50A, 100A, 150A, 200A |
| précision de mesure | ±(0.5% rd+2d) |
| Operating Time Options | Quick, 10s, 30s, 60s |
| Méthode d'affichage | 4-inch touchscreen |
| mode de communication | Vidage du disque U |
| Puissance de travail | AC220V ± 10% 50Hz |
| Pouvoir total | 1000W |
| Enregistrement de stockage maximum | 200 |
| environnement de travail | Temperature: -10°C~40°C, humidity: ≤80%RH |
| Dimensions | 390×300×200 mm3 |
| Poids | 7kg(No attachments) |
Caractéristiques
1、High Current Output: The circuit resistance automatic tester adopts advanced power technology, enabling continuous and prolonged output of high current. This overcomes the limitations of impulse power supplies that
rely on instantaneous current, effectively breaking down the oxide film on switch contacts to achieve reliable and accurate test results.
2、Excellent Stability: Under severe interference conditions, the last digit of the LCD display remains stable within a range of ±1 count, ensuring stable readings and outstanding repeatability.
3、High Precision: Utilizing dual high-speed 16-bit Σ-Δ AD sampling and advanced digital signal processing technology, the instrument achieves a maximum resolution of 0.01μΩ. It is one of the most stable contact resistance
testers currently available in China with this level of resolution, with performance exceeding that of imported high-current micro-ohmmeters.
4、Intelligent Operation: Equipped with an imported high-performance CPU, the system automatically switches measurement ranges based on signal amplitude to ensure testing accuracy. The built-in over-temperature
protection circuit automatically stops the current output when the instrument exceeds the set temperature, guaranteeing safe operation.
5、Premium Quality: All key components are imported. The ingeniously designed temperature compensation circuit effectively eliminates the influence of ambient temperature on measurement results, while the use of military
grade connectors enhances resistance to vibration.
6、Powerful Functions: The test current is freely selectable among 50A, 100A, 150A, and 200A. The test duration can be chosen from FAST mode, 10 seconds, 30 seconds, 60 seconds, or set arbitrarily. This performance far
surpasses that of other similar instruments.
7、User-Friendly Interface: The touch-screen interface allows for convenient and quick operation. Users can independently set the instrument's date and time, save measurement data in real time, and print results directly.
8、USB Data Transfer: Measurement data can be transferred to a USB flash drive via the USB interface. Combined with PC software, the data can be further analyzed and processed.
9、Portable Design: Compact, lightweight, and easy to carry, making it ideal for on-site testing applications.
FAQ about Circuit Breaker Contact Resistance Tester
Q: Why do high-precision loop resistance testers typically use high-current output?
A: High-precision loop resistance testers output a stable high current to effectively reduce the influence of environmental noise and lead resistance during contact resistance measurement, thereby achieving more accurate test results. A higher test current also more accurately reflects the conductive performance of circuit breakers, disconnecting switches, and busbar connection points under actual operating conditions.
Q: How does the test current level affect the measurement results?
A: Properly increasing the test current can reduce errors caused by unstable contact resistance and improve the consistency of measurement data. However, the test current should comply with the rated requirements of the equipment to avoid local heating of the device under test or safety risks due to excessive current. In practice, the appropriate test current level should be selected based on the equipment type and industry standards.
Q: How to select a suitable high-precision loop resistance tester for specific application needs?
A: When selecting a model, factors such as maximum output current, measurement range, resolution, measurement accuracy, data storage capacity, and portability should be comprehensively considered. For long-term on-site testing in substations or large industrial environments, attention should also be paid to the equipment's protection rating, battery life, and software compatibility to meet varying test conditions and future maintenance requirements.
