Microtest 7750 Series Impulse Winding Tester

The Microtest 7750 Series Impulse Winding Tester detects turn-to-turn insulation defects in coils, transformers, motors, and solenoids using high-voltage impulse testing with a 200 MHz sampling rate. Operating across 10 V to 10,000 V test voltage, the 7750 applies a fast-rise impulse to the winding under test and captures the resulting damped oscillation waveform, comparing it against a known-good reference to identify shorted turns, insulation breakdown, and winding faults that conventional hipot testing cannot detect.

Specifications

Feature	Specification
Sampling Rate	200 MHz
Test Voltage	10 V to 10,000 V
Minimum Inductance	0.1 µH
Test Speed	10 tests/sec
Comparison Algorithms	Area, differential area, flutter, corona
Tolerance	Configurable bands per test point
DUT Types	Motors, transformers, coils, solenoids, ignition coils
Interface	Handler, USB, RS232
Display	Waveform overlay (test vs. reference)
Safety	Interlock, high-voltage enclosure

High-Resolution Waveform Capture

The 200 MHz sampling rate resolves waveform differences down to inductance changes as small as 0.1 µH, catching single-turn faults in low-inductance coils that lower-bandwidth impulse testers miss. At 10 tests per second, the 7750 supports high-throughput production testing of motors, ignition coils, relay coils, and power transformers.

Multiple Detection Algorithms

Multiple comparison algorithms (area, differential area, flutter, corona) provide complementary detection methods for different fault types. Area comparison catches gross defects, differential analysis detects subtle waveform shifts from single-turn shorts, flutter analysis identifies intermittent faults from marginal insulation contacts, and corona detection distinguishes partial discharge from full insulation breakdown. Tolerance bands are configurable per test point, allowing engineers to set sensitivity appropriate to each winding type.

Applications

Motor manufacturers, transformer producers, ignition coil winding facilities, relay coil manufacturers, and solenoid assemblers all deploy impulse winding testing for 100% production verification. Impulse winding testing is increasingly required by automotive and industrial OEM quality specifications as the definitive method for detecting turn-to-turn insulation defects.

Watch the Microtest 7750 Series Impulse Winding Tester on YouTube

GSAS Micro Systems delivers the Microtest 7750 Series to motor manufacturers, transformer producers, and automotive coil winding facilities across India with INR invoicing and local application support. Engineers in Bengaluru, Hyderabad, Chennai, Pune, Mumbai, and Delhi NCR assist with test voltage selection, fixture design, and pass/fail criteria definition.