UHV-H100A Contact Resistance Tester

• 1、Large current: Micro Ohmmeter adopts The new technology of The power supply, which can continuously output large current for a long time. It overcomes The defect of impulse instantaneous current of The power supply, and can effectively break through The oxidation film of switch contact and get good test results

• 2、Strong anti-interference ability: under the condition of serious interference, the last bit data of LCD can be stable at ±1 word The scope of, stable reading, good repeatability

• 3、Micro Ohmmeter has a long service life: all Micro Ohmmeter adopts high precision resistance, which effectively eliminates The influence of The environment temperature on The measurement results. Meanwhile, The use of military connectors enhances The anti-vibration performance

• 4、Easy to carry: small volume、light weight

• 1、High-Current DC Output: The instrument provides a stable 100A DC test current as recommended by national standards for circuit breaker and isolating switch contact resistance measurement.

• 2、Direct Resistance Measurement: It directly measures the circuit resistance under the 100A current condition and displays the result digitally, overcoming the limitations of low-current methods.

• 3、Digital Display and Data Stability: It features a digital display that provides stable readings with good repeatability. Under severe interference, the last digit of the LCD reading remains stable within ±1 count.

• 4、Continuous Current Output: Using advanced power supply technology, the tester can continuously output a large current for a long time, which helps to effectively penetrate the oxide film on switch contacts for accurate results.

• 5、High Measurement Accuracy: The instrument uses high-precision resistors and stable components to ensure accurate and reliable measurements, with a rated resolution and accuracy designed to meet standard requirements.

• 1、Standard-Compliant Testing: It provides the 100A DC test current mandated by the latest Chinese preventive test regulations (e.g., SD301-88) for accurate contact resistance measurement of high-voltage switches, ensuring test results are valid and comparable.

• 2、Superior Performance on Contacts: The large, stable continuous current effectively penetrates the oxide film and oil films that form on contacts, which cause low-current (mA level) bridge methods to read inaccurately high.

• 3、Stability and Reliability: Strong anti-interference capability ensures stable readings in harsh field environments. The use of high-precision resistors and military-grade connectors enhances measurement accuracy, temperature stability, and vibration resistance, contributing to a long service life.

• 4、Portability: The instrument features a compact size and light weight, making it convenient to carry and use in various field locations.

• 1、Power Utilities and Substations: Used for measuring the contact resistance of high-voltage circuit breakers, isolating switches (disconnectors), busbar joints, and other connection points during routine preventive maintenance and handover tests.

• 2、Switchgear Manufacturing: Employed by manufacturers for quality control and factory resistance testing of new switchgear, ensuring contact resistance meets design specifications before delivery.

• 3、Industrial Facilities: Used in industries with large electrical systems (e.g., metal smelting, petrochemicals) for maintenance of high-current switchgear and busbar connections.

• 4、Testing Laboratories: Used by independent testing labs to perform contact resistance measurements for clients as part of equipment condition assessments.

• 1、Why is a 100A test current required for contact resistance measurement?
  National standards (such as SD301-88 and newer preventive test regulations) mandate a test current of at least 100A DC for circuit breaker and isolating switch contact resistance. Low-current (mA level) tests cannot break through the oxide films and oil layers on contacts, leading to falsely high resistance readings. The high current provides a true measurement of the metallic contact resistance.
• 2、How does the instrument handle interference on-site?
  The UHV-H100A Contact Resistance Tester is designed with strong anti-interference capability, ensuring that even under severe interference conditions, the last digit of the LCD reading remains stable at ±1 word. This makes it reliable for use in electrically noisy substation environments.
• 3、What are the advantages of continuous current output?
  Continuous current output, rather than a pulsed current, ensures that the oxide film on the contact surface is effectively broken down, leading to a stable and accurate resistance reading. This overcomes the defect of impulse instantaneous current found in some older designs.
• 4、What are the key durability features?
  The instrument uses high-precision resistors that are insensitive to temperature changes, ensuring measurement accuracy. It also uses military-grade connectors, which enhances its anti-vibration performance, making it robust for field use and contributing to a long service life.
• 5、What is the power supply for the unit?
  The instrument typically operate from a standard AC 220V supply or have a built-in battery for field operation.

Enterprise products in strict accordance with international and national standards and rules of industry production, through the national, provincial and municipal electric power research institute and electric power authorities detection, measuring center, fully passed the ISO9001 international quality management system certification, the licence for manufacturing measuring instruments of the People's Republic of China, GB/T19001-2016 quality management system requirements, GB/T24001-2016 environmental management system requirements, GB/T45001-2020 occupational health and safety management system requirements.

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