Glosary and Abbreviations
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6 Glosary and Abbreviations
Term Explanation
Arc Self-maintained gas conduction for which most of the charge carriers are electrons supplied by
primary- electron emission (source: IEC)
Auto Adjust Frequency
“0.1Hz/Auto”
Mode that maximizes output frequency to highest allowable value up to 0.1 Hz.
• Greatest allowable frequency depends on the test load and test voltage applied
• For loads greater than 0.5 µF, the instrument automatically reduces the frequency
DUT Device under Test
Duty (continuous) Load state in which the unit operates for an extended period.
Continuous means: no limitation in operating time based on temperature limits
Fault An unplanned occurrence or defect in an item which may result in one or more failures of the item
itself or of other associated equipment (source: IEC)
Frequency [Hz] Number of cycles per unit of time ; f=1/ Period (Time), units=Hz
1Hz = 1cycle / 1 second
0.1 Hz = 1cycle / 10 second , etc.
MWT Monitored Withstand Test
HV High Voltage: Voltage levels used in power distribution:
• Medium Voltage: up to 36 kV
• High Voltage: up to 110 kV
• Extremely High Voltage: 220 kV, 380 kV or higher (according to IEC/International Electro-
technical Vocabulary)
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