ST2883 Series Operation Manual
1-2
Lx
Vdc
C1
C2
Rx
SW
DUT
Vo(t)
accurate comparison methods, easy operation and various interfaces, ST2883 can provide a perfect test solution
for most winding products.
Principles of impulse winding test
The impulse winding tester tests the electrical characteristics of coil winding without damaging the DUT. The
prerequisite condition is to test the quality of a coil at just a glance. The detection is carried out when the same
electric impulse, as used in the standard coil and here discharged by a capacitor, is applied to the DUT. The voltage
attenuation wave is generated in response to the impulse, related to the Q-factor and inductance of the coil. In this
sense, the tester can detect turn and layer short, the differences in the number of turns and the material of the core.
If high impulse voltage is applied, the poor insulation will appear as a corona or layer discharge.
Figure 1-1 Simplified diagram for principles of impulse winding test
In figure 1-2, the self-oscillation attenuation wave has a close relation with the inductance L and quality factor Q,
while L and Q depend on the number of turn, manufacture technology, properties of iron core material and
whether it has air-coils. What’s more, the applied voltage is a high impulse voltage, thus, it is easy to observe the
short circuit, partial short turns and lays or turns discharge phenomenon caused by insulation damage.
Figure 1-2 Typical self-attenuation oscillation wave
1.2 Operation environment
1.2.1 Power supply
Voltage: 198V-242V AC, 99V-121V AC
Power frequency: 47.5Hz-63Hz
Consumption:
≤
40VA
1.2.2 Environment temperature and humidity
Normal working temperature: 0°C~40°C, Humidity:
≤
90%RH
