Recommended
ECG KOKUSAI DWIT-05 Impulse Winding Tester
New-generation, high-resolution impulse winding tester covering a broad 5 μH to 1 H inductance range.
View DWIT-05Motor · Coil · Inductor · Stator · Armature
Find the Right Winding & Coil Test Solution
Start with what you need to test—not a model number.
Choose your requirement and see the most suitable ECG KOKUSAI solutions.
Impulse winding testing, low-inductance testing, partial discharge, higher test voltage, and production-line inspection.
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What is your testing requirement?
Select one option. The recommended products below will change instantly.
Selected requirement
General Winding
Standard impulse winding inspection
General Winding & Coil Testing
For routine, nondestructive winding inspection using impulse waveform comparison to detect turn differences, layer shorts, winding abnormalities, and insulation-related defects.
Typical applications
- Motor windings
- General coils
- Transformers and solenoids
- R&D and production inspection
Recommended for this requirement
Recommended Products
ECG KOKUSAI DWX Series Impulse Winding Tester
Established DWX-01A / 05A / 10A platform for general coil inspection, selected according to required test voltage and application.
View DWX Series
Selected requirement
Low Inductance
Precision and ultra-low-inductance testing
Low-Inductance Coil & Inductor Testing
For power inductors, chip inductors, and other low-inductance components where fast waveform capture and a test circuit optimized for low-L measurements are required.
Typical applications
- Power inductors
- Chip inductors
- Low-inductance coils
- High-speed production inspection
Recommended for this requirement
Recommended Products
Low-Inductance
ECG KOKUSAI DWX-300LI3a / DWX-01LI3a Impulse Winding Tester
Dedicated low-inductance family: DWX-300LI for precision testing and DWX-01LI for ultra-low-inductance / high-speed applications.
View DWX-300LI / DWX-01LI
Selected requirement
Partial Discharge
PD / PDIV and insulation evaluation
Partial Discharge Testing for Windings & Coils
Choose the PD approach by test method: impulse partial-discharge testing, AC partial-discharge testing, or an integrated system combining AC, impulse, and insulation evaluation.
Typical applications
- EV / HEV motor windings
- Stators and coils
- PDIV / PDEV evaluation
- Insulation development and quality control
Recommended for this requirement
Recommended Products
Featured PD Solution
ECG KOKUSAI DWIT-05PD Impulse Partial Discharge Tester
Featured DWIT platform for high-resolution impulse winding inspection with partial-discharge evaluation.
View DWIT-05PD
Impulse PD
ECG KOKUSAI DWX-05PD Impulse Partial Discharge Tester
Impulse winding and partial-discharge testing solution for coil and motor-winding insulation evaluation.
View DWX-05PD
AC Partial Discharge
ECG KOKUSAI ACPD-05X AC Partial Discharge Tester
For AC partial-discharge evaluation up to 5 kVrms, including PD inception / extinction and discharge-level assessment.
View ACPD-05X
Integrated PD System
ECG KOKUSAI PD ONE Motor Coil/Partial Discharge/Insulation Evaluation System
Integrated motor-coil system combining AC PD, impulse PD, withstand-voltage testing, and multi-channel circuit switching.
View PD ONE
Selected requirement
High Voltage
Higher impulse test-voltage requirements
High-Voltage Impulse Winding Testing
For windings and insulation systems that require higher impulse test voltage, including applications beyond the standard 5 kV class.
Typical applications
- Higher-voltage motor windings
- Coil insulation qualification
- R&D validation
- Production quality assurance
Recommended for this requirement
Recommended Products
15 kV Class
ECG KOKUSAI DWX-15 / DWX-15PD 15 kV Impulse Winding Tester
15 kV-class impulse winding testing, with DWX-15PD available when partial-discharge evaluation is also required.
View DWX-15 / DWX-15PD
Up to 10 kV
ECG KOKUSAI DWX Series Impulse Winding Tester
DWX-10A provides up to 10 kV impulse testing for applications between the standard and 15 kV classes.
View DWX Series
Selected requirement
Production Testing
Automated and end-of-line inspection
Production-Line Motor & Coil Testing
For manufacturing environments that need integrated electrical inspection, automated pass/fail workflows, circuit switching, data handling, or dedicated stator / armature testing.
Typical applications
- Stator production inspection
- Armature production inspection
- End-of-line testing
- Automated multi-test systems
Recommended for this requirement
Recommended Products
Integrated Testing
ECG KOKUSAI WTS-05 General Winding Testing Machine
All-in-one winding test platform for motor, transformer, and coil inspection.
View WTS-05
ECG KOKUSAI Stator Coil Test System
Custom integrated system combining impulse, resistance, insulation, rotation, and other stator inspection functions.
View Stator Coil Test System
ECG KOKUSAI Armature Coil Test System
Automatic combined-control test system for armature coil inspection and production quality control.
View Armature Coil Test System
Stator Inspection
ECG KOKUSAI RDT-308 Rotation Direction Tester
Dedicated stator-coil inspection for rotation direction, wrong winding, connection errors, and magnetic-flux distribution.
View RDT-308Need help choosing?
Five details can narrow the selection quickly.
You do not need to know the ECG KOKUSAI model in advance. Start with your test object and electrical requirements.
- Test object Motor, stator, armature, coil, inductor, transformer
- Inductance range Especially important for low-inductance applications
- Required test voltage Standard or higher-voltage impulse testing
- Partial discharge Whether PD / PDIV evaluation is required
- Use environment R&D, bench inspection, or production / EOL
Winding Test Applications
Impulse Winding and Coil Testing by Application
Winding-test requirements change with the device under test, inductance, insulation system, test voltage, production environment, and whether partial-discharge evaluation is required. Start with the electrical and manufacturing requirement, then select the tester or integrated system.
General Motor, Coil, and Transformer Winding Inspection
Impulse waveform comparison is used for nondestructive winding inspection where differences in turns, layer shorts, winding abnormalities, or insulation-related defects need to be identified during R&D or production testing.
Low-Inductance Coil and Power Inductor Testing
Low-inductance parts require a test circuit and waveform-capture capability suited to fast electrical behavior. This is especially relevant to power inductors, chip inductors, and high-speed production inspection.
Partial Discharge and PDIV Evaluation
Motor windings, stators, and higher-stress insulation systems may require partial-discharge evaluation in addition to conventional impulse comparison. The appropriate method can be impulse PD, AC PD, or an integrated insulation-test system.
Production and End-of-Line Winding Testing
Manufacturing environments may require automated pass/fail judgment, circuit switching, multiple electrical tests, data handling, and dedicated stator or armature inspection rather than a standalone laboratory tester.
Test Method
Impulse Testing, Partial Discharge, and Integrated Winding Inspection
These methods answer different questions about a winding or insulation system. The correct test architecture depends on the defect or condition you need to evaluate.
Impulse Winding Test
Applies a short impulse to the winding and compares waveform behavior to identify differences associated with winding construction or insulation faults.
Partial Discharge Test
Evaluates discharge activity in the insulation system when PD / PDIV behavior is part of the development or quality requirement.
Integrated Production Test
Combines winding inspection with additional electrical tests, switching, automation, and pass/fail workflows for production or end-of-line environments.
How to Select
How to Select a Winding or Coil Test System
Model selection should follow the DUT and electrical requirement. The table below summarizes the first parameters to define before selecting the ECG KOKUSAI platform.
| Selection factor | Why it matters | Typical examples |
|---|---|---|
| Test object | Defines the winding structure and suitable inspection approach. | Motor, stator, armature, coil, inductor, transformer, solenoid |
| Inductance range | Low-inductance devices can require dedicated circuitry and faster waveform behavior. | General windings vs. power and chip inductors |
| Required test voltage | Determines whether a standard or higher-voltage impulse platform is required. | Standard class, 10 kV class, 15 kV class |
| Partial-discharge requirement | Determines whether impulse comparison alone is sufficient or PD / PDIV evaluation is also required. | No PD, impulse PD, AC PD, integrated PD |
| Test environment | Changes the need for switching, automation, data handling, and pass/fail integration. | R&D, bench inspection, production, end-of-line |
Frequently Asked Questions
Impulse Winding & Coil Testing FAQ
What does an impulse winding tester detect?
An impulse winding tester compares electrical waveform behavior after a short impulse is applied to the winding. Differences can indicate turn differences, layer shorts, winding abnormalities, or insulation-related defects. The exact judgment method depends on the tester and application.
When is a dedicated low-inductance tester needed?
A dedicated low-inductance solution is appropriate when the DUT has very low inductance and requires a test circuit and waveform-capture behavior optimized for fast electrical response, such as power or chip inductors.
What is the difference between impulse testing and partial-discharge testing?
Impulse winding testing evaluates waveform differences associated with winding and insulation behavior. Partial-discharge testing specifically evaluates discharge activity in the insulation system. Some applications require one method, while others use both.
When is a higher test voltage required?
Higher test voltage may be required when the winding or insulation system must be evaluated above the standard test-voltage range. The required voltage should come from the DUT specification, internal validation plan, or applicable test requirement.
What information should I provide before selecting a winding tester?
Provide the test object, approximate inductance range, required impulse voltage, whether PD / PDIV evaluation is needed, and whether the system will be used for R&D, bench inspection, or automated production testing.
Application Support
Need help configuring a winding or coil test system?
Share the DUT type, inductance range, required impulse voltage, partial-discharge requirement, production environment, and automation needs. Denkei Americas can help narrow the appropriate ECG KOKUSAI test approach and configuration.