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Products Infomation
- Products by Category
- Electronic measuring instruments
- Electrical safety testers / measuing instruments
- MICROTEST Impulse Winding Tester 7703
Using non-destructive high-speed pulse testing voltage technology to measure insulation defects in wound components, comparing the damping attenuation waveforms generated by inductance and capacitance resonance to identify defective products.
MICROTEST 7703 is a Impulse Winding Tester that provides pulse voltage outputs ranging from 100V to 5000V. It 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. This model is specifically designed for Inverter-Transformer products and supports high-frequency harmonic/noise analysis mode. By amplifying the waveform through high-frequency resonance, it can precisely detect insulation defects caused by high-voltage coil slot leakage. The tester also offers various comparison modes, including total area comparison, area difference comparison, corona count comparison, jitter count comparison, and waveform comparison.
Impulse Winding Tester
Model:
7703
Maker:
MICROTEST
Introduction of Impulse Tester
Impulse Winding Tester use the comparison of pulse to measure the DUT. The instrument provide high voltage to do the instant pulse test and record the wave. Compare with the golden sample to define the product.
| Application | |
| Low inductance coil | |
| High power inductance | |
| Transformer | |
| Motor stator | |
| Motor rotor | |
| Winding component |
Damping wave under L/C resonate comes from the feature change of defect coil.
- _Inductance of coil
- _Q rate
- _Turn ratio of coil(voltage different)
- _Material of core
- _Layer short in the coil
Features
- Lowest Inductance (0.5uH)
- HARM analysis / HFLT analysis
- 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
MICROTEST 7703 Impulse Winding Tester
Specifications
| Model | 7703 |
| Test Channel | Single channel |
| Impulse Voltage | 100V-5000V (programmable ) |
| Impulse Voltage
Accuracy |
±2% |
| Lowest Inductance | 0.5uH |
| 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
192Vac-264Vac |
| Frequency：50/60Hz ±5% | |
| Power consumption | 300VA |
| Environment | Temperature：10℃-40℃ |
| Humidity：20-90%RH | |
| Dimension | 435x145x522 mm (W*H*D) |
| Weight | 8 Kg |
| Interface | RS-232、Remote、Printer |
| Display | 5.7″ dot-matrix (300*240 ) |
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