It is necessary to establish a simple
test procedure intended to verify and document the SWC generator
performance prior to its use for these tests. Two verification tests
shall be defined:
a) SWC waveform validity tests
b) SWC test generator performance
verification
Waveform validity tests
The waveform validity tests shall be
performed before and after each SWC test session, with the results
recorded and included with the SWC test report. The tests described
are intended to verify that there is no major insulation breakdown,
damage, or test system component failure that may have occurred
during the physical test setup, test application, or prolonged
instrument storage.
The waveform validity tests shall
include
a) Measuring system feedthrough test
b) Oscillatory SWC test generator open
circuit voltage waveform test
c) Fast transient SWC test generator
open circuit voltage waveform test
Measurement methods different from
those described in the Annex A are acceptable, as long as the same
level of precision and the same parameters are used to document the
results.
SWC test generator performance
verification
A full set of SWC test generator
characteristics shall be verified as per manufacturer’s
recommendations or at least once every year, with the test results
dated, recorded, and included with each SWC test report. These tests
are intended to precisely document the test generator characteristics
and are used to track the SWC generator’s compliance with this
standard.
The characteristics to be verified are
given in Table 1.
Table 1—Test generator
characteristics to be verified
Fast transient Oscillatory waveform
Rise time Rise time of the first
peak
Peak voltage level (no load) Peak
voltage level (no load)
Output impedance Output impedance
Impulse duration Waveform envelope
decay
n/a Oscillation frequency
Repetition rate during the burst
Repetition rate
Burst duration n/a
Burst period n/a
Test duration Test duration
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