MICROTEST 7720 is a Impulse Winding Tester that provides pulse voltage outputs ranging from 100V to 5000V. It features 8 testing channels and utilizes damping attenuation waveforms generated by L/C resonance to analyze magnetic components for defects such as short circuits between coils or between layers of winding wire. The tester offers various comparison modes, including total area comparison, area difference comparison, corona count comparison, jitter count comparison, and waveform comparison. These modes help identify and detect faulty products accurately.
|Impulse Voltage||200V-5000V (programmable )|
|Impulse Voltage Accuracy||±2%|
|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.
|Differential area comparison||
Add up the difference between normal wave and DUT wave call “ Area differential”.
By calculating and comparing the deference of area between golden sample and DUT. To determine the degree of waveform overlap.
|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.
|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|
|Dimension||435x190x522 mm (W*H*D)|
|Display||5.7" dot-matrix (300*240 )|