EN
DRM-10W 10A Portable DC Resistance Tester
DRM-10W Digital Intelligent Portable DC Resistance Tester (10A Max Current, Built-in Battery) with 0.1μΩ Resolution, 4-Wire Kelvin Measurement, Auto Back-EMF Protection, Copper/Aluminum Temperature Conversion, 1000 Groups Data Storage, for Transformer Winding, Motor Winding, Instrument Transformer, Switch Contact Resistance Test.
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The DRM-10W is a high-precision, portable DC resistance test instrumentexclusively designed for fast and accurate measurement of DC resistance in inductive and resistive loads. It fully complies with DL/T 845.3-2019 and GB 50150-2016 standards, adopting advanced constant current source technology and 4-wire Kelvin measurement method to eliminate lead resistance and contact resistance errors, replacing traditional DC single and double arm bridges.
The instrument features a 5.6-inch high-brightness industrial LCD screen and intuitive keypad operation, supporting both fixed current and automatic current selection modes. It has a built-in fast charge/discharge circuit that can stabilize readings within 3 seconds, and a comprehensive back-EMF protection system to ensure operator and equipment safety. Equipped with a 7.4V/10Ah large-capacity lithium battery, it can work continuously for more than 8 hours without external power supply, making it ideal for on-site testing. It also supports copper/aluminum temperature automatic conversion, 1000 groups of data storage, and USB data export. Ideal for factory acceptance tests, on-site commissioning tests and preventive maintenance tests of power transformers, motors, instrument transformers, switches, cables and busbars.
Specifications
| Parameter | Specification |
|---|---|
| Maximum Output Current | 10A |
| Current Gears | 1mA, 10mA, 100mA, 1A, 5A, 10A (auto/manual selection) |
| Measurement Range | 10A: 0.1μΩ – 2Ω 5A: 1μΩ – 4Ω 1A: 10μΩ – 20Ω 100mA: 100μΩ – 200Ω 10mA: 1mΩ – 2kΩ 1mA: 10mΩ – 20kΩ |
| Resolution | 0.1μΩ |
| Accuracy | ±0.2% of reading ± 2 digits (full range) |
| Measurement Method | 4-wire Kelvin measurement |
| Stabilization Time | ≤3 seconds |
| Temperature Conversion | Copper (20℃/75℃), Aluminum (20℃/75℃) automatic conversion |
| Data Storage | 1000 groups (with time stamp, power-off protection) |
| Data Export | USB interface, PDF/Excel report generation |
| Display | 5.6-inch high-brightness industrial LCD screen |
| Power Supply | AC 220V±10%, 50Hz + built-in 7.4V/10Ah lithium battery |
| Battery Life | >8 hours continuous operation at 10A output |
| Charging Time | ~4 hours (full charge) |
| Protection Functions | Back-EMF protection, Over-current protection, Over-temperature protection, Short-circuit protection, Reverse polarity protection |
| Dimensions (mm) | 360×290×170 (L×W×H) |
| Weight | ~6kg (including battery) |
| Operating Temperature | -10℃ ~ +50℃ |
| Operating Humidity | ≤90%RH (non-condensing) |
| Altitude | ≤2000m |
| Compliance | DL/T 845.3-2019, GB 50150-2016, IEC 60076-1:2022, IEC 60404-2:2008 |
Applications
Core Test Objects
- Power transformers: winding DC resistance test (10kV/35kV/110kV transformers)
- Electric motors: stator and rotor winding DC resistance test
- Instrument transformers: current transformer (CT) and voltage transformer (VT) winding test
- Low-voltage switchgear: circuit breaker, contactor, relay contact resistance test
- Power cables and busbars: conductor DC resistance test
- Welding points: weld quality inspection
- Batteries: internal resistance test
- Reactors: shunt reactor and series reactor winding test
Typical Usage Scenarios
- Transformer manufacturing plants: factory acceptance tests (FAT) of transformer cores and windings
- Power companies: on-site commissioning tests and preventive maintenance tests
- Motor manufacturing plants: motor winding quality inspection
- Third-party testing laboratories: compliance testing and certification
- Mining and industrial enterprises: equipment inspection and maintenance
- Technical schools and universities: teaching and demonstration experiments
Advantages
Compliance with International Standards
Fully meets DL/T 845.3-2019, GB 50150-2016 and IEC 60076-1 standards → test results are globally recognized
Ultra-High Precision & Sensitivity
0.1μΩ resolution and ±0.2% accuracy → detects minute resistance variations caused by poor welding, loose connections and broken strands
3-Second Fast Test
Advanced fast charge/discharge circuit → improves test efficiency by 80%, reduces test time from minutes to seconds
Comprehensive Safety Protection
Automatic back-EMF protection and discharge indication → maximum safety for operators and expensive test equipment
Portable & Long Battery Life
6kg lightweight design with 8-hour battery life → ideal for on-site testing in remote substations and power plants
Intelligent Data Management
Automatic temperature conversion, 1000 groups data storage and USB export → eliminates manual recording errors, improves data traceability
Cost-Effective Solution
High performance at a competitive price → ideal for small and medium-sized enterprises and field test teams
FAQ
Q: What is the advantage of 4-wire Kelvin measurement over 2-wire measurement?
A: 2-wire measurement includes the resistance of the test leads and contacts in the result, which can cause significant errors for low resistance measurements. 4-wire Kelvin measurement uses two separate pairs of leads: one pair to supply current and the other pair to measure voltage, completely eliminating lead and contact resistance errors. This is essential for accurate measurement of low resistances below 1Ω.
Q: Can DRM-10W test inductive loads such as transformer windings?
A: Yes. It is specifically designed for inductive load testing. It has a built-in fast charge/discharge circuit and comprehensive back-EMF protection system that can safely absorb the reverse electromotive force generated by inductive loads during discharge, preventing damage to the instrument and ensuring operator safety.
Q: What is the automatic temperature conversion function?
A: The resistance of copper and aluminum conductors changes with temperature. The instrument can automatically convert the measured resistance value at the test temperature to the standard temperature (20℃ or 75℃) according to the temperature coefficient of copper or aluminum, making it easy to compare test results with standard values.
Q: How long does it take to test a transformer winding?
A: With the advanced fast charge/discharge circuit, the instrument can stabilize readings within 3 seconds for most transformer windings, which is 80% faster than traditional DC bridges. The total test time for a three-phase transformer is less than 1 minute.
Q: Does it support data storage and export?
A: Yes. It can store 1000 groups of test data with time stamp (power-off protection). The data can be exported to a USB flash drive in PDF or Excel format for further analysis and report generation.
