Of loop resistance tester UHV-H100P

portabledigitalUSB

The UHV-H100P is a contact (loop) resistance tester for measuring switch contact loop resistance and DC resistance of cables in low-resistance, large-current testing scenarios.

Features

• High continuous test current using advanced switching power supply to penetrate contact oxide films and ensure reliable readings.
• Stable readings with good repeatability; LCD display remains stable within ±1 digit under interference.
• High precision: dual high-speed 16-bit Σ-Δ A/D sampling with digital signal processing; resolution up to 0.01 μΩ.
• Intelligent operation: automatic range switching during measurement and built-in over-temperature protection that stops output when limits are exceeded.
• Quality components and temperature compensation circuit to reduce ambient influence; robust connectors for vibration resistance.
• Flexible test settings: selectable test current 50 A or 100 A; adjustable test time 5 s to 599 s.
• User-friendly interface: rotary input for quick data entry, independent date/time setting, real-time data saving and printing.
• USB export: measurement data can be exported via USB (U-disk) for PC analysis.
• Portable: compact size and light weight for field use.

Technical parameters

• Measuring range 50A 010mΩ/100A 05mΩ
• Resolution 099.99μΩ, 0.01μΩ/100.010000.0μΩ, 0.1μΩ
• Test current DC50A, 100A two-speed fixed output
• measurement accuracy ±(0.5% rd+2d)
• Operating Time Options​ Quick, 10s, 30s, 60s
• Display method 4-inch touchscreen
• communication mode U disk dump
• Working power AC220V±10% 50Hz
• Total power 600W
• Maximum storage record 200
• working environment temperature: -10℃40℃, humidity≤80%RH
• Dimensions 390×300×150 mm3
• Weight 6kg(No attachments)

Additional information / aliases

• Alternate names: Contact Resistance Test; Loop tester
• High-resolution micro-ohmmeter capability suitable for contact/loop and cable DC resistance measurements.
• Key functions: auto-ranging, temperature compensation, over-temperature protection and data export via USB.

Routine maintenance

• 1. Appearance and structural inspection

-Check the instrument casing for cracks, deformations, or burn marks before and after each use.
-Check whether the test line and fixtures (such as crocodile clips and blade clips) are intact, whether there is insulation damage, wire breakage, clamp oxidation or erosion.
-Check if the wiring terminals are loose to ensure reliable connection.

• 2. Cleaning of testing lines and fixtures

-Wipe the outer skin of the test line and the metal parts of the fixture with a clean soft cloth.
-If the clamp has oxidation or dirt, it can be lightly polished with fine sandpaper or a metal cleaning cloth to expose the metallic luster and ensure good contact.
-After cleaning, a small amount of conductive paste can be applied (optional, depending on the situation) to prevent further oxidation.

• 3. Instrument surface cleaning

-Wipe the surface of the instrument with a slightly damp soft cloth to remove dust and oil stains.
-Prohibit the use of corrosive solvents (such as acetone, gasoline) or direct rinsing with water to prevent liquid from seeping into the interior.

• 4. Proper storage

-Wrap the test line neatly after use to avoid tangling or excessive bending.
-Place the instrument and accessories in a dedicated instrument box or drying cabinet to prevent moisture, dust, or compression.