Products Description
Our transformer dc resistance tester measures transformers, instrument transformers, generators, and motors with automatic or selected-current testing. The handheld unit stores results and supports USB export, printing, and a mobile application.
Technical Principle
A regulated DC test current is injected into the winding and the stabilized voltage drop is measured. Four-wire calculation removes lead resistance, and discharge control safely releases stored magnetic energy after the test.
Product Features
The transformer dc resistance tester covers micro-ohm winding measurements and higher resistance values with one portable unit. Automatic testing reduces manual range-selection work during repetitive measurements. Protection circuits and clear indication help prevent common connection errors. Local memory, USB export, printing, and mobile control support traceable test records.
Operating Conditions
Install the product in a clean, ventilated location without corrosive gas, conductive dust, water ingress, severe vibration, or strong impact. Provide reliable protective grounding, maintain the required electrical clearances, and use the rated auxiliary power supply. Confirm ambient temperature, humidity, altitude, enclosure protection, cable routing, and communication conditions before production and installation.
Product Parameters
|
Parameter |
Details |
|
10 A range |
200 μΩ-0.5 Ω; ±(0.2% reading + 1 μΩ) |
|
5 A range |
5 mΩ-3.0 Ω; ±(0.2% reading + 0.005 mΩ) |
|
1 A range |
20 mΩ-15 Ω; ±(0.2% reading + 0.02 mΩ) |
|
100 mA range |
200 mΩ-150 Ω; ±(0.2% reading + 0.2 mΩ) |
|
≤10 mA range |
2 Ω-50 kΩ; ±(0.2% reading + 2 mΩ) |
|
Memory |
512 groups |
|
Power |
Internal lithium battery or external charger; charger 100-240 VAC, 50/60 Hz |
|
Environment |
-10°C to +40°C; ≤85% RH |
|
Size / weight |
235×165×75 mm / 1.6 kg |
Product Advantages
- The transformer dc resistance tester covers micro-ohm winding measurements and higher resistance values with one portable unit.
- Automatic testing reduces manual range-selection work during repetitive measurements.
- Protection circuits and clear indication help prevent common connection errors.
- Local memory, USB export, printing, and mobile control support traceable test records.
Main Applications
The transformer dc resistance tester is used for transformer manufacture, installation, handover, preventive testing, and winding-fault investigation.
It also measures DC resistance on CTs, PTs, generators, motors, and other windings.
The instrument helps identify poor joints, broken strands, welding defects, and phase imbalance.
Components
|
Part |
Function |
|
Handheld test unit |
Sources DC current and measures the resulting voltage drop. |
|
Kelvin test leads |
Provide separate current and voltage connections for low resistance. |
|
Lithium battery and charger |
Support portable operation and recharging. |
|
Data interfaces |
Provide storage, printing, USB export, and mobile application access. |
FAQ
Q: What information is needed for model selection?
A: Provide expected resistance, winding connection, required current, test object, and record format.
Q: What should be checked before installation?
A: Isolate, discharge, and ground the test object; use clean terminals and secure Kelvin connections.
Q: How can the device or system be integrated?
A: Stored groups can be reviewed, printed, exported by USB, or handled through the stated mobile application.
Q: Which options should be confirmed before production?
A: Confirm current leads, charger, printer, mobile-app requirement, case, and calibration documents.
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