Abstract: A tamper-resistant device including a housing having a first surface and a second surface; and one or more covers positioned on the first surface of the housing, wherein the first surface includes at least two angled surfaces for receiving the one or more covers to create a securedly fixed connection, and wherein the one or more covers are securedly fixed to the housing via a snapping device.

Abstract: A tamper-resistant device including a housing having a first surface and a second surface; and one or more covers positioned on the first surface of the housing, wherein the first surface includes at least two angled surfaces for receiving the one or more covers to create a securedly fixed connection, and wherein the one or more covers are securedly fixed to the housing via a snapping device.

Abstract: A receptacle including a front surface including one or more slots for receiving contact blades; a rear surface including one or more terminals for connecting the contact blades to a power source, the one or more terminals being line terminals and load terminals; a shutter positioned between the front surface and the rear surface of the receptacle, the shutter configured to be misaligned in relation to the one or more slots in order to obstruct a direct path between the contact blades and the one or more terminals, wherein insertion of an object in the one or more slots causes displacement of the shutter; and a shutter lock operatively connected in the receptacle to receive power from the power source connected to the receptacle.

Abstract: A tamper-resistant device including a housing having a first surface and a second surface; and one or more covers positioned on the first surface of the housing, wherein the first surface includes at least two angled surfaces for receiving the one or more covers to create a securedly fixed connection, and wherein the one or more covers are securedly fixed to the housing via a snapping device.

Abstract: An electrical receptacle having a tamper resistant mechanism is disclosed. In addition, a GFCI can optionally be configured to include the tamper resistant mechanism. Furthermore, the GFCI can be configured so that the GFCI engages the tamper resistant mechanism when the GFCI is tripped or reset. When the GFCI is tripped, the tamper resistant mechanism is engaged such that it prevents user access to the face terminals of the electrical receptacle. When the GFCI is reset the tamper resistant mechanism does not restrict access to the face terminals of the electrical receptacle. The tamper resistant mechanism has one or more shutter positioned with respect to one or more entry ports to the face terminals. The shutter positioning restricts the insertion of prongs of an electrical plug when the GFCI device of the electrical receptacle is tripped. The GFCI device is tripped when it detects a fault.

Abstract: Method and apparatus for controlling an instrument which can perform a specified cyclic process. The instrument's process is controlled by a computer which has two concurrently defined tasks: an operator task for running an instrument control program, and a compiler task for compiling new instrument control programs input by the instrument's user. The currently running program is suspended and a new program's execution is begun when (a) a new program has been successfully compiled by the compiler, and (b) the current program is about to perform a jump back at the end of an instruction loop. When a main instrument control program finishes executing, a new program is run if a new program has been successfully compiled; otherwise, execution of the most recently suspended program resumes. Thus a newly compiled program interrupts the currently running program only between instruction loops, and only as long as necessary to execute its instructions.