3-in-1 Transformer Testing System
Low Voltage+Safety+Impulse

3-in-1 Transformer Testing System|Low Voltage+Safety+Impulse
  • Low Voltage Electrical Test 
  • Hi pot/ Insulation Test
  • Impulse Test (Layer Short Circuit)
  • 20 Channels
  • Test Frequency (200k/500k/1MHz)
  • AC Voltage Output 5000V
  • DC Votage Output 6000V
  • Insulation Resistance 12000MΩ

MICROTEST 3-in-1 Transformer Integrated Test System is a comprehensive solution that combines low-voltage electrical characteristics testing and safety compliance testing/Impulse Winding testing. It offers 20 testing channels and integrates low-voltage testing (including inductance, leakage inductance, resistance, capacitance, etc.) with AC/DC withstand voltage insulation testing (up to 5000V/6000V). It ensures efficient and convenient testing for transformer products. The impulse winding test uses non-destructive high-voltage pulse testing technology. It analyzes the damping attenuation waveform generated by L/C resonance to detect short-circuit defects between transformer coils or insulation layers.

To measure the inductance value of a transformer, you can use an LCR meter, which offers selectable test frequencies including 200kHz, 500kHz, and 1MHz. It supports software that allows connection to a PC, enabling the storage of test data.






Test Channel


Low Voltage Electrical Test
Model 6265 6266 6267
Frequency  10Hz-200kHz 10Hz-500kHz 10Hz-1MHz
Frequency Resolution 5 digits
Basic Accuracy ±0.1%
AC Drive Level 10mV-2Vrms
DC Drive Level 10mV-2V
Output Impedance 100Ω

Inductance or Voltage

Test Freqeuncy:50Hz-200kHz

Test Mode Meter Mode / List Mode
Parameters Measurement Inductance (L)、Impedance (Z)、Capacitance (C)、Resistance (R)、Conductance (G)、Susceptance (B)、Admittance (Y)、Alternating Current Resistance (ACR)、Quality Factor (Q)、θ、Direct Current Resistance (DCR)、Leakage Inductance、Turn Ratio、Balance、Short Circuit
L, LK 0.1nH ~ 9999.99H
C 0.00001pF ~ 999.99mF
Q,D 0.00001 ~ 99999
Z,X,R 0.00001Ω ~ 99.9999MΩ
Y 0.01nS ~ 99.9999S
θ -180°~ +180°
DCR 0.1mΩ ~ 99.999 MΩ
Turn 0.1 ~ 99999.9 turns
Pin-Short 12 pairs, between pin to pin
Hi pot/ Insulation Test
Items AC Hi pot DC Hi pot IR
Output Voltage  10V-5000V  10V-6000V  10V-1000V
Voltage Resolution  1V  1V 1V 
Voltage Accuracy      
 Test Range  0.001-31mA  0.001-11mA  1-12000MΩ
AC Arcing Detection 0-20 0-10  -
Measuring time 0.1-999s 
Ramp Time 0.1-10s 
Time Resolution 0.1s 
Impulse Test
Impulse Voltage 200V-5000V



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.



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.



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 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.


  Model Transformer Tester Impulse Tester Hi pot Tester
6265/6266/6267 7721 7605



128 sets 200 sets -





or 195Vac-264Vac






or 195Vac-264Vac

 Frequency:47-63Hz  Frequency:50/60Hz±5%  Frequency:47-63Hz






 344x145x343 mm (W*H*D)  435x190x522 mm  435x145x500 mm (W*H*D)
  Weight  9 Kg  14kg  15kg
  Interface  RS-232、Handler、LAN、USB Host、EXT. I/O  RS-232、Remote、Printer RS-232、Remote、USB Host、USB Device、EXT.I/O 
  Displa Color Screen, 7" TFT
5.7" TFT
Color Screen, 4.3" TFT