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HMDQ Power transformer winding resistance tester 50A dc resistance meter

Product Description


During the manufacturing of inductive coils of transformers, mutual inductors, reactors, and electromagnetic operating mechanisms, DC resistance measurement is required in factory tests, installation and handover tests, and preventive tests of the power sector for semi-finished and finished products.

Winding Resistance Tester can effectively identify manufacturing defects (e.g. loosening, strand missing, broken wires in material selection, welding and connection for inductive coils) and hazards in operation.


  1. The tester has 7 levels of output current (maximum: 50A; minimum: <5mA), which is suitable for DC resistance measurement of a variety of transformers and mutual inductors.
  2. The measurement range of the tester is 40μΩ to 100KΩ.
  3. The tester has a higher response speed. The on-load tap switch can be directly enabled during measurement, and the tester will automatically refresh data.
  4. The tester has the function of sound discharge alarm and clear discharge indication, to reduce misoperation.
  5. The tester has complete protection functions for reliable protection against the impact of back EMF, thus achieving more reliable performance.
  6. The tester is equipped with a 7-inch color LCD screen, which can display data in a clear and attractive manner. In addition, output results can be printed in a real-time manner.
  7. The operation interface (Chinese and English) of the tester can be configured as required by customers.
  8. The tester has a RS485 communication interface to transmit test data to the background.
  9. The tester has a large storage capacity for 500 test records at most.
  10. The tester has USB interface for transfer of test data into USB flash disks.
  11. More complete parameters can be set, including the test winding, tap position, test phase, test sample temperature, conversion temperature and others of the transformer.
  12. The tester has an industrial plastic case, which is easy to carry and helpful to prolong the service life.


1. Output current: 50A,20A, 10A, 5A, 2A, 100mA, <5mA (7 levels for testing).
2. Range:
40μΩ to 400mΩ   (50A)
100μΩ to 1Ω      (20A)
500μΩ to 2Ω      (10A)
1mΩ to 4Ω        (5A)
2mΩ to 10Ω       (2A)
100mΩ to 200Ω    (100mA)
200Ω to 100kΩ     (<5mA)
3. Accuracy: ±(0.2%+2word)
4. Resolution: 0.1μΩ
5. Working temperature: -10~40℃
6. Ambient humidity: ≤90% RH, no condensation
7. Altitude: ≤1000meters
8.Working power supply: AC220V ± 10%, 50HZ ± 1HZ
9. Dimensions: 428mm * 350mm * 230mm
10. Weight: 10.9kg