Safety tester UHV-10C

resistancestator windingfor electrical equipment

Overview
Built-in large-capacity lithium battery, compact and portable. Fast measurement speed and high accuracy. Equipped with resistance–temperature conversion function for direct RT analysis.

Product parameters
This transformer DC winding resistance tester is designed for field and workshop use on transformers, reactors and other inductive components, as well as conductive/resistive samples such as busbars and switch contacts. Portable form factor with integrated battery allows extended testing without mains supply.

Technical parameters
Direct resistance test
Current gear | Measuring range | Current gear | Measuring range
10 A | 500μΩ ~ 200mΩ | 100 mA | 10Ω ~ 200Ω
5 A | 10mΩ ~ 1Ω | 10 mA | 50Ω ~ 2kΩ
1 A | 100mΩ ~ 20Ω | 1 mA | 500Ω ~ 50kΩ

Technical index
Accuracy: ±(Reading × 0.2% + 2 digits) | Maximum resolution: 0.1μΩ

Conditions of use and appearance
Power supply: Built-in lithium battery or external charger (charger input 100 ~ 240 VAC, 50/60 Hz)
Charging voltage/current: 16.8 V / ≤2 A | Charging time: ≈4 hours | Service time per full charge: >8 hours
Main unit weight: 3.6 kg (excluding test leads) | Dimensions (main unit): 325 × 225 × 125 mm
Operating temperature: -10℃ ~ 50℃ | Relative humidity: ≤90% (no condensation)

Features

• Dual power options: internal lithium battery or 220 V AC adaptive charger for flexible field/workshop use.
• Selectable output currents up to 10 A (≤10 A / 25 V) with auto-ranging for fast, safe measurements.
• Wide measurement span: from 500μΩ up to 50 kΩ across selectable current gears.
• Resistance–temperature conversion: built-in RT calculation to provide temperature-corrected resistance values.
• Comprehensive safety protections: back‑EMF, open‑circuit, power‑loss and over‑temperature detection with alarms.
• Sunlight‑readable 5.6" industrial color LCD for outdoor use and clear readout.
• Data output and reporting: local memory plus USB export; supports external printers for instant reports.

Precautions

• Test the no‑load voltage regulating winding; do not operate the no‑load tap changer during testing or before voltage discharge.
• During testing or discharge do not remove test leads or interrupt the power switch.
• When testing a transformer, windings on the unmeasured side must be open‑circuited.

Specifications / technical characteristics

• Model: UHV-10C
• Measuring current ranges: 10 A, 5 A, 1 A, 100 mA, 10 mA, 1 mA
• Resistance measuring ranges: 500μΩ ~ 200mΩ; 10mΩ ~ 1Ω; 100mΩ ~ 20Ω; 10Ω ~ 200Ω; 50Ω ~ 2kΩ; 500Ω ~ 50kΩ
• Accuracy: ±(Reading × 0.2% + 2 digits)
• Maximum resolution: 0.1μΩ
• Power supply: Built-in lithium battery or external charger (100 ~ 240 VAC, 50/60 Hz)
• Charging voltage/current: 16.8 V / ≤2 A
• Charging time: ≈4 hours; Service time: >8 hours per full charge
• Weight (main unit): 3.6 kg (excluding test leads)
• Dimensions (main unit): 325 × 225 × 125 mm
• Operating temperature: -10℃ ~ 50℃
• Relative humidity: ≤90% (no condensation)
• Display: 5.6" industrial color LCD (sunlight‑readable)
• Data output: Local memory and USB export; supports external printer
• Safety features: Protections for back‑EMF, open‑circuit, power‑loss and over‑temperature with alarms

Application in the power industry

• In the power industry, DC resistance testers are mainly used to measure the DC resistance of electrical equipment such as transmission lines, substation equipment, and motors. By regularly inspecting and troubleshooting these devices, the stable operation of the power system can be ensured, avoiding safety accidents and economic losses caused by abnormal resistance.
• Transmission lines are an important part of the power system, and the measurement of their DC resistance is crucial for ensuring the stable operation of the power system. The DC resistance tester can be used to detect the contact resistance, wire resistance, and insulator resistance of transmission lines, helping power companies detect and solve potential problems in a timely manner, ensuring the reliability and stability of power transmission.
• In substation equipment, DC resistance testers can help power companies detect the DC resistance of equipment such as transformers, circuit breakers, and current transformers. By measuring the resistance values of these devices, their operating status and performance can be determined, potential problems can be identified and resolved in a timely manner, ensuring the normal operation of the substation equipment and avoiding power interruptions and equipment damage caused by faults.
• In motor testing, DC resistance tester can be used to measure the winding resistance, rotor resistance, etc. of the motor. By measuring the resistance of the motor, its operating status and performance can be determined, and motor faults and problems can be detected and solved in a timely manner, ensuring the stable operation of the motor and avoiding production interruptions and equipment damage caused by faults.