Loop impedance testing device UHV-H100A

digitalportablerugged

The UHV-H100A Contact Resistance Tester measures contact resistance of high-voltage circuit breakers and loop contacts using a continuous high-current DC source to break oxide films and obtain repeatable, accurate readings.

Key features

• Large continuous output current: new power supply technology delivers high DC current continuously to overcome pulse-source limitations and effectively break oxide films on switch contacts.
• Strong anti-interference performance: stable LCD readings with last-data stability within ±1 digit under severe interference; good repeatability.
• Long service life and stability: high-precision resistors reduce temperature influence; military-grade connectors improve vibration resistance.
• Portable design: compact dimensions and light weight for field use and easy transport.

Media & resources

• Embedded product demo/introduction video (YouTube).
• Product images and gallery showing unit, accessories and application scenarios.
• Available PDF resources: User Manual and Calibration Certificate.

Technical specifications

• Measuring range: 11999μΩ
• Resolution: 1μΩ
• Test current DC: 6-100A
• Accuracy: 0.5%±1d
• Operating mode: Continuous
• Display mode: ​​3.5-digit LED display
• Power supply: AC220V±10% 50Hz
• Working environment Temperature: -10℃~40℃, humidity: ≤80%RH
• Diemension: 390×300×150mm3
• Weight: 6kg(excluding attachments)

Precautions

• 1. Please read the instruction manual carefully before using the instrument.
• 2. Please follow the correct wiring method in the instruction manual.
• 3. This instrument is not allowed to test the circuit resistance in live circuits.
• 4. The instrument must be reliably grounded during use.
• 5. Current line users are not allowed to replace them at will.
• 6. When not in use, the instrument should be stored in a ventilated, dry, cool, and clean place, paying attention to moisture and corrosive gases.

Purpose

• A circuit resistance tester is a precision instrument used to detect contact resistance, conductor resistance, and electrical connection quality in electrical circuits. Its main function is to ensure that the resistance values of the wiring and contact parts in the electrical system comply with design and safety standards, and to avoid electrical faults or fire hazards caused by excessive resistance. In the fields of power industry, construction engineering, equipment maintenance, and safety testing, circuit resistance testers are essential tools.

Working principle

• The working principle of the circuit resistance tester is based on Ohm's law, which measures the resistance value by applying a certain current. Devices typically generate a constant current and calculate resistance by measuring changes in current and voltage. During the testing process, the instrument will pass current through the tested circuit and record the voltage drop to obtain the resistance value. This process can help us assess the safety of grounding systems and electrical equipment.