Abstract: According to one example, an electrical device is provided comprising an input configured to receive power from at least one power supply, an output configured to provide the power to at least one load, a first memory configured to store data temporarily, a second memory, the second memory being non-volatile memory, and at least one control device configured to acquire data indicative of at least one parameter of the power responsive to a sample condition being met, store the acquired data in the first memory, determine that a fault condition exists based on the acquired data, the fault condition being indicative of a fault of one or more electrical-device components, and store the acquired data in the second memory responsive to determining that the fault condition exists.

Abstract: Systems and methods of measuring dynamic signals for power distribution units. In one embodiment, a power distribution unit (PDU) includes an analog to digital converter (ADC) including a plurality of channels, each channel corresponding to a respective outlet of a plurality of outlets of the PDU. The PDU further includes a microprocessor coupled to the ADC and configured to measure a scale of a signal output from a first channel of the ADC, compare the scale of the signal to a sensitivity threshold, and select, for a first outlet corresponding to the first channel, a reference voltage of a plurality of reference voltages for input to the ADC based on a result of comparing. Various embodiments allow using an ADC to measure low level outlet currents of less than around 300 mA in addition to high level currents such as around 20 A.

Abstract: Systems and methods of measuring dynamic signals for power distribution units. In one embodiment, a power distribution unit (PDU) includes an analog to digital converter (ADC) including a plurality of channels, each channel corresponding to a respective outlet of a plurality of outlets of the PDU. The PDU further includes a microprocessor coupled to the ADC and configured to measure a scale of a signal output from a first channel of the ADC, compare the scale of the signal to a sensitivity threshold, and select, for a first outlet corresponding to the first channel, a reference voltage of a plurality of reference voltages for input to the ADC based on a result of comparing. Various embodiments allow using an ADC to measure low level outlet currents of less than around 300 mA in addition to high level currents such as around 20A.

Abstract: A rack power distribution unit (rPDU) for an electronics equipment rack includes a rPDU body having a front surface, a power inlet cord coupled to the rPDU body, a plurality of power outlets on a surface of the rPDU body in electrical communication with the power inlet cord, and a display including a display body having a right side and a left side and a display screen. The display body is pivotably mounted to the front surface of the rPDU body and configured to pivot about an axis.

Abstract: A system of managing power distribution units includes a master rack PDU and a plurality of child rack PDU's. The master rack PDU is coupled to a network and is configured to receive short-range wireless signals. The plurality of child rack PDU's are configured to transmit short-range wireless signals including data measurements. The master rack PDU receives the data measurements in the short-range wireless signals transmitted by the plurality of child rack PDU's and the master rack PDU transmits the data measurements to a computer over the network.

Abstract: A system of managing power distribution units includes a master rack PDU and a plurality of child rack PDU's. The master rack PDU is coupled to a network and is configured to receive short-range wireless signals. The plurality of child rack PDU's are configured to transmit short-range wireless signals including data measurements. The master rack PDU receives the data measurements in the short-range wireless signals transmitted by the plurality of child rack PDU's and the master rack PDU transmits the data measurements to a computer over the network.

Abstract: A new coronagraph sufficiently increases the contrast ratio between the infrared image of a nonsolar star and a possible orbiting nonsolar planet to make imaging of such a planet possible. The coronagraph is used with an infrared telescope system having a square objective or aperture. Unwanted stellar irradiance is diffracted orthogonally by the square telescope aperture or objective so that a coronagraph apodizer in the first focal plane in the shape of crossed arms, and a coronagraph Lyot stop in the pupil plane with a square opening, stop most of the on-axis direct and diffracted stellar energy while allowing most of the planet irradiance to pass through the coronagraph. The discarded light reflected from the back of the apodizer can be used to provide information concerning piston and tilt error of individual segments of a segmented telescope so that an array of correcting piston-tilt mirrors can be controlled to align the telescope.

Abstract: A new coronagraph sufficiently increases the contrast ratio between the infrared image of a nonsolar star and a possible orbiting nonsolar planet to make imaging of such a planet possible. The coronagraph is used with an infrared telescope system having a square objective or aperture. Unwanted stellar irradiance is diffracted orthogonally by the square telescope aperture or objective so that a coronagraph apodizer in the first focal plane in the shape of crossed arms, and a coronagraph Lyot stop in the pupil plane with a square opening, stop most of the on-axis direct and diffracted stellar energy while allowing most of the planet irradiance to pass through the coronagraph. The discarded light reflected from the back of the apodizer can be used to provide information concerning piston and tilt errors of individual segments of a segmented telescope so that an array of correcting piston-tilt mirrors can be controlled to align the telescope.

Abstract: A plurality of subaperture arrays which may be disposed within the diameter of the conventional single large aperture in order to achieve improved sidelobe energy characteristics with respect to that of the single large aperture. The apertures may be embodied as optical sources or radio frequency energy sources. The preferred arrangements of the subapertures include dispositions on concentric circles circumscribed within the single large aperture with a single aperture at the center of the large aperture and six, twelve, eighteen, twenty four and so on subapertures disposed on each subsequent concentric circle. One particularly attractive subaperture arrangement includes a total of nineteen subapertures with the outer concentric circle twelve of these subapertures being slightly rotated with respect to those of the inner concentric circles.