Ultra-Low-Inductance Coil Testing for High-Speed Inspection
The ECG KOKUSAI DWX-300LI3a and DWX-01LI3a are impulse winding testers designed for high-speed inspection and detailed evaluation of ultra-low-inductance coils and power-inductor components.
The two models use a 4-terminal test circuit and two inductance ranges to support testing from 0.01 µH to 100 µH. High-speed waveform acquisition and fine voltage-setting resolution support detailed evaluation of short response waveforms in low-inductance components.
0.01 µH to 100 µH
Two-range inductance coverage
Maximum 300 MHz
3.3 ns/sample waveform acquisition
10 ms
Fastest high-speed test without judgment
300 V / 1,000 V
Model-specific test voltage for 1 µH or higher
The tester supports waveform-area, difference-area, peak-voltage stability, Laplacian, and attenuation-rate judgment together with contact checking. Up to 16 test pulses can be configured after the PreCheck pulse.
High-speed mode supports inspection-handler timing, while extended RS-232C and external I/O provide control for automated inspection workflows. The tester stores up to 196 master waveforms.
For broader low-inductance test selection,
see the Low-Inductance Coil & Inductor Testing Solutions →
Ultra-Low-Inductance Testing
Two inductance ranges cover 0.01 µH to 1 µH and 1 µH to 100 µH for testing ultra-low-inductance coils and power-inductor components.
Maximum 300 MHz Waveform Sampling
Waveform sampling up to 300 MHz with 3.3 ns/sample resolution enables detailed acquisition of fast response waveforms.
High-Speed 10 ms Testing
In high-speed mode, the shortest test time is 10 ms without judgment and 18 ms with judgment using one pulse without screen display.
4-Terminal Test Circuit
A 4-terminal test circuit supports high-voltage impulse testing of ultra-low-inductance coils while reducing the influence of the test connection.
Fine Voltage Setting
The DWX-300LI3a provides 0.1 V setting steps, while the DWX-01LI3a provides 0.3 V setting steps.
Multiple Judgment Functions
Supports Waveform Area, Waveform Difference Area, Peak Voltage Stability, Laplacian, attenuation-rate judgment, and contact checking.
196 Master Waveforms
Stores up to 196 master waveforms for product-specific test and judgment conditions.
Production-Line Integration
Extended RS-232C and external I/O support external control, with high-speed interface timing for inspection handlers.
Ultra-low-inductance coil testing
Chip power inductor insulation testing
Power inductor coil evaluation
Detailed coil-component evaluation
High-speed pass/fail inspection
Mass-production line inspection
DWX-300LI3a / DWX-01LI3a Model Comparison
| Specification | DWX-300LI3a | DWX-01LI3a |
|---|---|---|
| Inductance Range |
L-LO: 0.01 µH to 1 µH L-HI: 1 µH to 100 µH 2-range switching | |
| Test Voltage Range (1 µH or higher) | 1 V to 300 V | 3 V to 1,000 V |
| Set Voltage Resolution | 0.1 V step | 0.3 V step |
| Measured Voltage Resolution | 0.2 V/dgt. | 1.0 V/dgt. |
| Waveform Sampling | Maximum 300 MHz / 3.3 ns per sample | |
| Sampling Range | 7 ranges, manual switching | |
| Application Pulses | PreCheck: 1 pulse / Test: maximum 16 pulses | |
| High-Speed Mode |
With judgment: 18 ms Without judgment: 10 ms | |
| Tester Mode |
With screen display: 108 ms Without screen display: 53 ms | |
| Judgment Functions | Waveform Area, Waveform Difference Area, Peak Voltage Stability, Laplacian, Attenuation Rate | |
| Contact Check | CE | |
| Test Circuit | 4 terminals | |
| Test Cable Length | Within 2 m; 1.6 m recommended | |
| Master Waveform Memory | 196 models | |
| External Control | Extended RS-232C and I/O | |
| External I/O | Impression trigger, application termination, and high-speed interface timing support for inspection handlers | |
| Dimensions | 345 (W) × 185 (H) × 360 (D) mm, excluding carrying handle | |
| Power Supply | AC 100 / 115 / 220 / 240 V ±5%, changeable | |
For inductances below 1 µH, applicable voltage depends on inductance and coil characteristics. The manufacturer provides a separate maximum-applied-voltage reference specifically for the DWX-300LI3a.
