Definitions
- Actual ESD events: Non-simulated electrostatic discharges that occur in the environment of the electronic equipment.
- Air discharge method: A method of ESD testing in which the charged electrode of the ESD simulator approaches the
EUT regardless of the conductivity of the surface being subjected to the ESD event. A spark in air to the EUT actuates the
discharge.
- Bleeder wire: Conductive wire with high impedance, high voltage series resistors to dissipate applied electric charge from
HCP, VCP and EUT slowly.
- Charging current: The maximum continuous current at any charge voltage that may flow at the ESD simulator probe tip
as measured on the return path of the simulator through a 1500-resistor connected to the probe tip.
- Contact discharge method: A method of ESD testing in which the electrode of the ESD simulator is in firm electrical con-
tact with a conductive surface of the EUT or coupling plane prior to discharge. A switching device (i.e., a relay) within the
simulator actuates the discharge.
- Controlled ESD environment: One in which an attempt is made to maintain charge and/or voltage levels on humans
and objects below a certain level. Typical control measures include humidity controls, equipment earth grounding, use of
anti-static materials, ionized air, and high-resistance discharge paths for humans.
- Coupling plane: A metal plate to which discharges are applied to simulate electrostatic discharge to objects adjacent
(vertically or horizontally) to the EUT. See also: HCP, VCP.
- Direct ESD test: A test in which ESD is applied directly to the surface or structure of the EUT.
- Electrostatic discharge (ESD): The sudden transfer of charge between bodies of differing electrostatic potentials.
- ESD event: The occurrence of a single ESD.
- ESD simulator: A testing device used to simulate a human ESD event.
- ESD target adapter: Adapter used to connect reference pulse or sinusoidal generators to the ESD target.
- ESD test voltage: The amplitude (usually expressed in kV) of the electrostatic voltage that exists prior to discharge.
- EUT: Equipment Under Test.
- Exerciser: A device used to operate the EUT.
- Failure: The inability of a product to meet its operating specification.
- Fault: In testing a digital circuit, any difference between the expected and the actual output sequences produced in re-
sponse to an input sequence. A fault may or may not lead to a failure.
- Ground reference plane (GRP): A flat conductive surface whose potential is used as a common reference. Where appli-
cable, the operating voltage of the EUT and the operator ground should also be referenced to the ground plane.
- Hand/metal ESD: An ESD from an intruding human hand that occurs from an intervening metal object such as a ring, tool,
key, etc. Also called: hand/metal discharge.
- HCP: Horizontal coupling plane.-
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