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SPDC Terms D-E
DC HOLDOVER
In applications where dc voltage exists on a line, a holdover condition is one in which a surge-protective device continues to conduct after it is subjected to an impulse large enough to cause breakdown. Factors that affect the time required to recover from the conducting state include the dc voltage and the dc current.
[C62.31–1987 & C62.32–1987]
DC HOLDOVER VOLTAGE
The maximum dc voltage across the terminals of an arrester under which it may be expected to clear and to return to the high-impedance state after the passage of a surge, under specified circuit conditions.
[C62.31–1987 & C62.32–1987]
DC STANDBY CURRENT (VARISTOR)
Varistor current measured at rated voltage. Vm(dc).
[C62.33–1989]
DECOUPLING NETWORK
Electrical circuit for the purpose of preventing an EFT signal applied to the equipment under test from affecting other devices, equipment or systems which are not under test. See back filter.
[C62.45–1992]
DEFLECTOR
A means for directing the flow of the gas discharge from the vent of the arrester.
[C62.1–1989 & C62.11–1987]
DESIGN TESTS
Tests made by the manufacturer on each design to establish the performance characteristics and to demonstrate compliance with the appropriate standards of the industry. Once made, they need not be repeated unless the design is changed so as to modify performance.
[C62.1–1989 & C62.11–1987]
DES
Discharge Electrostatic; an alternative name for ESD.
[C62.47–1992]
DIODE
A semiconductor device having two terminals and exhibiting a nonlinear voltage-current characteristic; in more restricted usage, a semiconductor device that has the asymmetrical voltage-current characteristic exemplified by a single p-n junction.
[C62.37–1996 & STD. 100-2000]
DIRECT ESD EVENT
An ESD event taking place between an intruder and a receptor in which the intruder or the receptor, or both, is an equipment victim.
[C62.47–1992]
DISCHARGE COUNTER
A means for recording the number of arrester discharge operations.
[C62.1–1989 & C62.11–1987]
DISCHARGE CURRENT
The surge current that flows through an arrester.
[C62.11–1987]
The current that flows through an arrester when sparkover occurs.
[C62.1–1989 & C62.31–1987 & C62.32–1987]
DISCHARGE INDICATOR
A means for indicating that the arrester has discharged.
[C62.1–1989 & C62.11–1987]
DISCHARGE VOLTAGE
The voltage that appears across the terminals of an arrester during the passage of discharge current.
[C62.31–1987 & C62.1–1989 & C62.11–1987 & C62.32–1987]
DISCHARGE WITHSTAND CURRENT RATING
The specified magnitude and wave shape of a discharge current that can be applied to an arrester a specified
number of times without causing damage to it.
[C62.1–1989 & C62.11–1987]
DISCHARGE-VOLTAGE-CURRENT CHARACTERISTIC
The variation of the crest values of discharge voltage with respect to discharge current.
[C62.31–1987]
The variation of the crest values of discharge voltage with respect to discharge current.
NOTE: This characteristic is normally shown as a graph based on three or more current-surge measurements of the same wave shape but of different crest values.
[C62.1–1989 & C62.11–1987]
DISRUPTIVE DISCHARGE
The sudden and large increase in current through an insulating medium, due to the complete failure of the medium under the electrostatic stress.
[C62.1–1989 & C62.2–1987 & C62.11–1987 & C62.22–1991]
DUTY CYCLE VOLTAGE RATING
The designated maximum permissible voltage between its terminals at which an arrester is designed to perform its duty cycle.
[C62.11–1987]
DYNAMIC IMPEDANCE (VARISTOR)
A measure of small signal impedance at a given operating point as defined by: ZX=dVX/dIX.
[C62.33–1989]
EQUIPMENT UNDER TEST (EUT)
A representative component, unit or system to be used for evaluation purposes.
[C62.45–1992]
EQUIPMENT VICTIM
The electronic equipment or subassembly which is subjected to the effects associated with an ESD event. It may be the intruder or receptor, or it may be in proximity to the discharge between the intruder and receptor, and therefore subjected to the stress of ESD related electromagnetic fields.
[C62.47–1992]
ESD CURRENT WAVE
The waveform of the discharge current between an intruder and a receptor.
[C62.47–1992]
ESD EVENT
Includes the ESD current, electromagnetic fields and corona effects before and during an ESD.
[C62.47–1992]
ESD
Electrostatic Discharge: the sudden transfer of charge between bodies of differing electrostatic potentials.
[C62.47–1992]
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