EMC-PARTNER 103514, Руководство пользователя

Страница: 12 / 112

MIG-OS-OS1_MIG0603OS1_MIG0603OSI M odular I mpulse G enerator
12/112
1.1.3 Voltage tests with 1.2/50 µs 0.5 J and 500
Ω
Impulse withstand test 1.2/50 µs
The classic insulation withstand test is carried out with a 1.2/50 µs waveform. This waveform must remain
within tolerances, when applied to device under test. As long as the devices under test are resistive,
capacitive or inductive the 1.2/50µs wave shape can be kept within the tolerances. With protection circuits
involved, it is no longer possible to keep the waveform within tolerances. As a consequence in IEC 255-5 a
generator and a test procedure are specified for insulation withstand tests based on a defined source
energy and impedance. The waveform is verified without the device under test. During tests the waveform
must not be monitored.
Impedance of the test generator
The 500 ohm serial resistor of the generator defines the source impedance and limits the current through
the device under test. The maximum energy of the generator must be 0.5 Joule ± 10% for each test level.
Circuit of the generator as defined in IEC 834-1, (IEC 255-4)
Relevant standards: IEC 255-5, 834-1 EN 61036, VDE 435 Teil 303
Test voltage Energy Generator-
impedance Impulse
Capacitor Voltage
waveform oc Current waveform
sc
0.5 kV 0.5 J 500 Ohm 4.0 µF 0.5kV 1.2/50us 1A 1.2/50us
1 kV 0.5 J 500 Ohm 1.0 µF 1kV 1.2/50us 2A 1.2/40us
3 kV 0.5 J 500 Ohm 110 nF 3kV 1.2/50us 6A 1.2/25us
5 kV 0.5 J 500 Ohm 40 nF 5kV 1.2/50us 10A 1.2/10us