EPSON SKP326-3 Counter card

EPSON SKP326-3 Counter card

For the evaluation of the impulse voltage tests, the evaluation of oscillographic records is a most widely and most used method that is stated in the standard. For evaluation purposes, the oscillographic record of the reference waveform which has small magnitude ( 50% ......75% ) should completely coincide with the oscillographic record of the wave form which has full magnitude ( 100% ). In some cases, there might be inconsistencies in the oscillogrammes due to the effects caused by the arrangement of the test circuit, external disturbances and/or earthing circuit. Such deviation should not be considered as indication of a failure.

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Differences in the instant of firing 

of the stages in the impulse generator may give rise to initial high frequency oscillations in the front part of the voltage vaweform. Small differences in the wave pattern because of the chopping time may cause deviations after chopping. These should not be considered as symptom for any failure. If the impulse voltage to the neutral points is requested in technical specifications; the method of impulse voltage application on this point are stated by two ways in the standards.

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