The ST4030 is an impulse winding tester that combines the functions of both a resistance meter and insulation-withstand testing required for electric motor winding manufacturers to improve quality.
The ST4030 is an impulse winding tester that combines the functions of both a resistance meter and insulation-withstand testing required for electric motor winding manufacturers to improve quality.  Meet the needs of more reliable motor windings in light of the increasing use of electric vehicles and self-driving technology. Key Features • Identify previously undetectable defects  • Detect waveforms with high precision (200 MHz high speed sampling × high 12-bit resolution) • Identify single-fault turns via quantification of response waveforms • Diagnose defective insulation (pseudo-shorts) between motor windings by testing for microscopic partial discharges hidden in noise (option)

Hioki ST4030 Impulse Winding Tester - Introductory Video
The Impulse Winding Tester ST4030 identifies the LC and RC characteristics from the response waveform when a coil is measured. Because the circuit constant value can be treated quantitatively, users can clearly define the threshold values against which to determine the pass/fail condition of coils based on numerical data. In addition, because the test results are in numerical terms, data can be further utilized statistically as a method of quality control. Accumulated data from each fault can be fed back to upstream processes to predict conditions that would lead to non-compliant windings and contribute to the prevention of future defects.


High-precision waveform detection
 
Slight changes in response waveforms that make it difficult to distinguish the difference between good and defective coils can be detected with a high level of precision. The 200MHz high-speed sampling captures sudden changes with remarkable detail, and the 12-bit high resolution provides the clear differences between the waveforms. Detect shorts among even just a few turns Quantification of response waveforms now make it easy to identify the differences in the coil among even just a few turns, an ability that has been difficult in the past. The LC and RC distribution between compliant and non-compliant products provide a clear criterion to make informed decisions.


Detect hard to identify shorts among even just a few turns
Quantification of response waveforms now make it easy to identify the differences in the coil among even just a few turns, an ability that has been difficult in the past. The LC and RC distribution between compliant and non-compliant products provide a clear criterion to make informed decisions.