Impulse Winding Tester 7750 Series

Impulse Winding Tester 7750 Series|7750-10S/5S/5H/5E/1S
  • Lowest Inductance (≥0.1μH)
  • High voltage calibration
  • programmable impulse voltage
  • 200MHz/9bit  High Impulse Test Sampling Rate
  • Total Area Comparison
  • Differential Area Comparison
  • Corona  Comparison
  • LAPLACIAN Comparison
  • Voltage Compensation Function

MICROTEST 7750 Series is an advanced Impulse Winding Tester with a faster color display screen. It provides pulse voltage outputs of 1200V/5200V/10000V and utilizes high-speed sampling technology at 200MHz/9 bits. It offers various comparison modes such as total area, area difference, corona count, jitter count, second-order differentiation, and waveform comparison. With a testing speed of up to 10 times per second, it is ideal for high-speed production lines.

For testing small components, the optional 7750-1S tester comes with the FX-IM0001 four-wire SMD component testing fixture. It features voltage compensation to minimize voltage errors caused by wiring and equivalent inductance, ensuring accurate quality control for products with small inductance.



7750 Series
Model 7750-5E 7750-5H 7750-5S 7750-1S 7750-10S
Sampling Rate 50MHz 100MHz 200MHz
Voltage Output 100V-5200V 100V-5200V 100V-5200V 10V-1200V 200V-10000V
Lowest Inductance ≥ 1μH ≥ 0.1μH ≥ 20μH
Test Time 10 times/second
Breakdown Voltage Test - -
LAN Interface - -
Waveform Analysis
Total area comparison
Differential area comparison
LAPLACIAN Comparison -
Corona comparison
FLUT Comparison
COMP Comparison



Sampling Rate 200MHz/9 bit
Pulse Number Max. 32
Input Impedance 20MΩ
Measurement Statistics
Breakdown Voltage
Measurement Time 10 times/second
Provides 6 waveform comparison

Total area comparison

When layer short happened, the loss of power on coil increase, the resonance damping coefficient increase, resonance amplitude decrease, the total area decrease. These are the basic parameters we check layer short.


By calculating and comparing the deference of area between golden sample and DUT.

Show by percentage
Analysis the power loss by this data.

Differential area comparison

Add up the difference between normal wave and DUT wave call “ Area differential”.

When layer short happened, the inductance reduce(similar the transformer). The wave phase change and the area differential also change. This will show “fail” on the instrument.

However, the parameter might cause deviation because of the deviation of inductance, resonance phase shift. (Silicon steel product such as motor and traditional transformer is not suitable)


By calculating and comparing the deference of area between golden sample and DUT. To determine the degree of waveform overlap.
Compare the inductance by this.

Corona comparison

In pulse test, the insulation defect will cause discharge and create corona. This function is able to count the times that corona happened base on the degree of deviation.

Detect the discharge phenomenon on the coil.


LAPLACIAN Comparison

Poor insulation quality of the coil results in discharge under high voltage impact, causing rapid changes in the oscillation waveform. By employing the 7750 second-order differentiation algorithm, the maximum discharge capacity is obtained, effectively detecting quality issues related to electrical leakage caused by poor solder joints in the monolithic inductor.

COMP Comparison

By setting an allowable waveform range for the standard wave, this feature can simultaneously determine the
amplitude and phase of the resonant wave. It enhances the detection capability of inter-turn short circuits.

FLUT Comparison

When there is inter-turn discharge in the winding coil, the waveform will exhibit tremors or fluctuations. Therefore, the instrument quantifies the degree of waveform tremors into numerical values for comparison.


  PLC Remote Control Test、About
  PLC Remote Output Signal PASS、FAIL、HV Output、Testing
  Built-in Storage 200 sets testing waveform
  Power Supply Voltage:98Vac-132Vac 或192Vac-264Vac 
Frequency:50/60Hz ±5%
  Power consumption 45VA
  Environment Temperature:10℃-40℃
  Dimension 430x132x370 mm (W*H*D)
  Weight 7Kg

USB Host/Device、RS-232、Remote、LAN

GPIB (Option)

  Display 7" dot-matrix (800*480 )