Abstract: Current injection electrostatic discharge equipment that includes a discharge capacitor connected to the input terminal of a sulfur-hexafluoride filled relay for selectively applying a current discharge to a test tip, the wave shape of the current discharge being highly repeatable.

Abstract: Disclosed is improved apparatus for applying a test electrical surge from a surge generator to equipment under test. The apparatus includes a coupler/filter that comprises an inductor in each leg of the input power line. In order to dissipate the energy stored in the inductors as the result of a unidirectional test surge, and thereby prevent damage from undershoot to the equipment under test, the apparatus includes high voltage rectifiers across the inductors.

Abstract: Current injection electrostatic discharge equipment that includes a discharge capacitor connected to the input terminal of a switch or relay which selectively applies a current discharge from the capacitor to a test tip, the wave shape of the current discharge being shaped to match a standardized waveform. Shaping is achieved by providing first and second inductor coils in series between the output terminal of the switch and the test tip, and by providing an electrically conductive plate connected to the junction of the inductors so as to provide a free space capacitance.

Abstract: Disclosed is an improved impulse circuit for delivering, from an electrical charge in a capacitor, an electrostatic spark discharge across an air gap to equipment under test. The circuit includes a gas gap in series combination between said air gap and the high energy side of the capacitor. Also included is a divider network, including resistors connected across the gaps so as to apportion voltages across the gaps upon application of the charge from the capacitor to the resistors so that initial electrical conduction through a first of the gaps leads to a spark discharge across the second gap, and the major flow of current from the capacitor passes first through the second gap and then through said already conducting first gap to produce said spark discharge across the first gap with current waveforms defined primarily by the firing characteristics of the second gap under conditions of overvoltage of the second gap.

Abstract: Apparatus for applying a test static-electric discharge from a test tip to equipment under test in two modes, which apparatus includes a capacitor, a power supply, and a normally closed relay for connecting the high side of the capacitor to the tip. Means are provided for actuating the relay to open and close, and means are provided for actuating the power supply to charge the capacitor. In an air-discharge mode, the power supply is actuated for charging the capacitor while the relay is closed and thus not energized. For direct-injection mode operation, the apparatus includes a timing circuit interconnected so that the relay is opened a finite delay time before power supply is actuated to charge the capacitor, the relay remaining open until the capacitor is charged, and thereafter the relay automatically closes to permit discharge of the capacitor.