7720 Impulse Winding Tester

7720 Impulse Winding Tester



  • Lowest Inductance (50uH)
  • 8 Channels
  • High voltage calibration
  • programmable impulse voltage
  • Built-in storage 200 sets testing waveform
  • Total area comparison
  • Differential area comparison
  • Wave comparison
  • Flat and Corona
  • Support RS-232, remote and printer interfaces
  • Key lock function to prevent operators from accidentally touching the keys



Model 7710 7720 7703 7713
Test Channel 2 8 2 2
Impulse Voltage 200V-10000V 200V-5000V 100V-5000V 200V-10000V
Lowest Inductance 100uH 50uH 0.5uH 0.5uH
HARM analysis - -
HFLT analysis - -


Model 7720
Test Channel 8
Impulse Voltage 200V-5000V (programmable )
Impulse Voltage Accuracy ±2%
Lowest Inductance 50uH
Measurement Time 50mS
Provides 5 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.

Wave comparison Set a acceptable wave range, if the DUT’s wave is in this range shows “pass” otherwise, “fail”
This parameter can judge both amplitude and phase of resonance wave. This can increase the detection capability of layer short.
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.

Flat comparison

If the layer short happened, the waveform will tremble. Therefore, the instrument will quantize and compared it.


  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 300VA
  Environment Temperature:10℃-40℃
  Dimension 435x190x522 mm (W*H*D)
  Weight 9 Kg
  Interface RS-232、Remote、Printer
  Display 5.7" dot-matrix (300*240 )