EN
DRM-10 DC Winding Resistance Meter
DRM-10 Digital Intelligent Basic Single-Channel DC Resistance Tester (10A Max Current) with 0.1μΩ Resolution, 4-Wire Kelvin Measurement, Auto Back-EMF Protection, Copper/Aluminum Temperature Conversion, 1000 Groups Data Storage, for 10kV-35kV Distribution Transformer, Motor Winding, Instrument Transformer, Switch Contact Resistance, Welding Point Test.
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The DRM-10 is a high-precision, cost-effective basic single-channel DC resistance test instrumentexclusively designed for fast and accurate measurement of DC resistance in small and medium 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. It supports copper/aluminum temperature automatic conversion, 1000 groups of data storage, and USB data export. With AC220V power supply and compact portable design, it is suitable for both laboratory and on-site testing. Ideal for factory acceptance tests (FAT), on-site commissioning tests and preventive maintenance tests of 10kV-35kV distribution transformers, motors, instrument transformers, switches, cables, busbars and welding points.
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 |
| Protection Functions | Back-EMF protection, Over-current protection, Over-temperature protection, Short-circuit protection, Reverse polarity protection |
| Dimensions (mm) | 400×225×350 (L×W×H) |
| Weight | ~3.5kg (without test cables) |
| 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
- Distribution transformers: 10kV/35kV oil-immersed and dry-type distribution transformers (up to 10MVA)
- Electric motors: small and medium synchronous motors and induction motors
- 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 (exothermic welding, resistance welding)
- Batteries: internal resistance test
- Reactors: shunt reactor and series reactor winding test
Typical Usage Scenarios
- Transformer manufacturing plants: factory acceptance tests (FAT) of distribution transformers
- Power companies: on-site commissioning tests and preventive maintenance tests
- Motor manufacturing plants: motor winding quality inspection
- Third-party testing laboratories: basic 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 test equipment
Compact & Lightweight Design
3.5kg ultra-lightweight portable design → easy to carry and operate in narrow spaces
Intelligent Data Management
Automatic temperature conversion, 1000 groups data storage and USB export → eliminates manual recording errors, improves data traceability
High Cost-Effectiveness
Excellent performance at an entry-level price → ideal for small and medium-sized enterprises and basic test teams
FAQ
Q: What is the difference between DRM-10, DRM-10W and DRM-20?
A:
- DRM-10 (Basic 10A): 10A maximum current, AC220V power supply only, 3.5kg weight, entry-level price, optimized for 10kV-35kV distribution transformers and basic on-site testing
- DRM-10W (Portable 10A): 10A maximum current, built-in 8-hour lithium battery, 6kg weight, optimized for remote on-site testing without power supply
- DRM-20 (High-Current 20A): 20A maximum current, AC220V power supply (optional battery), 7kg weight, optimized for 35kV-110kV medium and large transformers All three use 4-wire Kelvin measurement and have the same ±0.2% measurement accuracy.
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-10 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: How long does it take to test a 35kV distribution transformer winding?
A: With the advanced fast charge/discharge circuit and 10A high-current output, the instrument can stabilize readings within 3 seconds for most 35kV distribution transformer windings, which is 80% faster than traditional DC bridges.
