Abstract: Current measurement apparatus comprises a measurement arrangement and a signal source. The measurement arrangement is configured to measure a current signal drawn by a load. The signal source is operative to apply a reference input signal to the measurement arrangement whereby an output signal from the measurement arrangement comprises a load output signal corresponding to the load drawn current signal and a reference output signal corresponding to the reference input signal.

Abstract: Current measurement apparatus comprises a measurement arrangement and a signal source. The measurement arrangement is configured to measure a current signal drawn by a load. The signal source is operative to apply a reference input signal to the measurement arrangement whereby an output signal from the measurement arrangement comprises a load output signal corresponding to the load drawn current signal and a reference output signal corresponding to the reference input signal.

Abstract: In some implementations, windows can be displayed based on a global z-order. The global z-order can be maintained for all open windows. The global z-order can include windows that are not currently displayed. The global z-order can define a display order of windows across multiple workspaces. In some implementations, workspaces can be associated with respective levels. The workspace levels can be used to determine how to display windows associated with each workspace when multiple workspaces are displayed simultaneously.

Abstract: The invention pertains to a method and system which utilizes individual lighting fixtures and electrical plug controls to provide a rigorous and ubiquitous grid of sensors within or around a facility or facilities. The system utilizes a variety of parameters at the tag, lighting and plug controllers and central processor level to provide unique location and tracking information on objects, equipment, and personnel in the facility. The unique aspects of the system provide higher spatial and temporal accuracy and the ability to track high spatial densities of devices.

Abstract: In some implementations, windows can be displayed based on a global z-order. The global z-order can be maintained for all open windows. The global z-order can include windows that are not currently displayed. The global z-order can define a display order of windows across multiple workspaces. In some implementations, workspaces can be associated with respective levels. The workspace levels can be used to determine how to display windows associated with each workspace when multiple workspaces are displayed simultaneously.

Abstract: The present invention relates to power conversion apparatus (40) configured to receive a high voltage alternating current (AC) signal at an input (42, 44) and to provide in dependence thereon a low voltage direct current (DC) signal from an output stage (58, 60). The power conversion apparatus (40) comprises a main path comprising a high voltage capacitor (46) in series with the input. The power conversion apparatus (40) also comprises a first path operative to carry current carried by the main path in at least one of a positive going part and a negative going part of the high voltage alternating current signal and a second path operative to carry current carried by the main path in a positive going part and a negative going part of the high voltage alternating current signal. The power conversion apparatus further comprises first and second switches (52, 54) which are operative to determine when a respective one of the first and second paths carries current.

Abstract: The present invention relates to electrical measurement apparatus (10). The electrical measurement apparatus (10) comprises a measurement arrangement (20,24) configured to be disposed in relation to an electrical circuit (12,14,16,18) which bears an electrical signal, the measurement arrangement (20,24) being operative when so disposed to measure the electrical signal. The electrical measurement apparatus (10) further comprises a signal source (22) operative to apply a reference input signal to the measurement arrangement (20,24) whereby an output signal from the measurement arrangement comprises an electrical output signal corresponding to the electrical signal and a reference output signal corresponding to the reference input signal, the reference input signal having a substantially piecewise constant form which is repeated over each of plural cycles.

Abstract: A signal level crossing detector circuit includes a DC isolator and a detector circuit. The DC isolator has at least a first input, which is operable to receive a high voltage AC signal, and at least a first capacitor, a first plate of the first capacitor being electrically connected to the first input. The detector circuit is operable at a low voltage and has at least a first detector input, the first detector input being electrically connected to a second plate of the first capacitor, the low voltage detector circuit being operable to provide a change in output signal in dependence on a high voltage AC signal on the first input crossing a predetermined signal level. The signal level crossing detector may be single ended or differential.

Abstract: A signal level crossing detector circuit includes a DC isolator and a detector circuit. The DC isolator has at least a first input, which is operable to receive a high voltage AC signal, and at least a first capacitor, a first plate of the first capacitor being electrically connected to the first input. The detector circuit is operable at a low voltage and has at least a first detector input, the first detector input being electrically connected to a second plate of the first capacitor, the low voltage detector circuit being operable to provide a change in output signal in dependence on a high voltage AC signal on the first input crossing a predetermined signal level. The signal level crossing detector may be single ended or differential.

Abstract: The present invention provides a device and method for aligning a drill bit of a hand drill to a specific angle—typically, perpendicular to the surface to be drilled. Concurrently, the invention provides a method to measure the depth of the drilled hole. The device of the invention comprises: (a) a signal source that generates a signal (typically a light pattern) that varies in response to changes in angle or depth of the drill bit; and (b) a holder to which the signal source is attached, the holder is mounted to the drill chuck of the drill and moves with its rotation. By using of the present invention, an image is generated that changes with angle or depth changes of the drill bit. This image is used by the operator to orient the angle of the drill bit or to determine the depth of the hole drilled.

Abstract: Current measurement apparatus comprises a measurement arrangement and a signal source. The measurement arrangement is configured to measure a current signal drawn by a load. The signal source is operative to apply a reference input signal to the measurement arrangement whereby an output signal from the measurement arrangement comprises a load output signal corresponding to the load drawn current signal and a reference output signal corresponding to the reference input signal.

Abstract: The invention discloses an electrical isolator circuit comprising: an input stage comprising a transmitter of an opto-isolator; and an output stage comprising: a receiver of the opto-isolator; an active circuit in series with the receiver between the receiver and a power rail of the output stage; a first resistor connected to an output of the active circuit, and an input for the application of a predetermined voltage to the active circuit, the output stage being configured such that a varying output voltage is developed across the first resistor in response to input of a high voltage AC signal to the input stage. Ideally the output stage is operable to clamp the voltage across the receiver at the level of the predetermined voltage, thereby allowing for an increase in the load resistor and variable output resistor without increasing the time constant to unacceptably having regards to switching requirements.

Abstract: Disclosed is an electrical isolator circuit comprising an input stage comprising first and second inputs, the input stage being configured to receive an input voltage signal; an output stage comprising first and second outputs electrically connected across a load capacitor; and a DC isolator comprising a first capacitor between said first input and said first output and second capacitor between said second input and said second output. The first and second plates of each of the first, second and load capacitors are defined by conductive layers of a printed circuit board and the dielectric of each of the first, second and load capacitors are defined by a non-conducting part of the printed circuit board.

Abstract: A blank of material for use in assembling a container is provided. The blank includes four side panels each including a top edge and a bottom edge, and four bottom panels each extending from a respective one of the side panel bottom edges, such that in the assembled container, the bottom and side panels are oriented to at least partially define a compartment configured to store at least one meter therein. The blank further includes at least one securing assembly including a plurality of cutouts shaped and oriented to secure the at least one meter within the compartment in the assembled container, the securing assembly extending from the top edge of one of the side panels.

Abstract: A voltage measurement circuit is operative to measure a high voltage AC signal and includes a capacitive divider circuit and a compensator circuit. The capacitive divider circuit includes first and second inputs, across which, in use, is received a high voltage AC signal and also includes second and third capacitors. First and second plates of each of the first, second and third capacitors are defined by conductive layers of a printed circuit board and the dielectric of each of the first, second and third capacitors being defined by a non-conducting part of the printed circuit board. A compensator circuit has a configurable transfer function and includes an input connected across the first and second plates of the third capacitor and an output. The compensator circuit is operative to change a voltage received at its input in accordance with the transfer function and to provide the changed voltage at its output.

Abstract: A voltage measurement circuit is operative to measure a high voltage AC signal and includes a capacitive divider circuit and a compensator circuit. The capacitive divider circuit includes first and second inputs, across which, in use, is received a high voltage AC signal and also includes second and third capacitors. First and second plates of each of the first, second and third capacitors are defined by conductive layers of a printed circuit board and the dielectric of each of the first, second and third capacitors being defined by a non-conducting part of the printed circuit board. A compensator circuit has a configurable transfer function and includes an input connected across the first and second plates of the third capacitor and an output. The compensator circuit is operative to change a voltage received at its input in accordance with the transfer function and to provide the changed voltage at its output.

Abstract: In some implementations, windows can be displayed based on a global z-order. The global z-order can be maintained for all open windows. The global z-order can include windows that are not currently displayed. The global z-order can define a display order of windows across multiple workspaces. In some implementations, workspaces can be associated with respective levels. The workspace levels can be used to determine how to display windows associated with each workspace when multiple workspaces are displayed simultaneously.

Abstract: A voltage measurement circuit is operative to measure a high voltage AC signal and includes a capacitive divider circuit and a compensator circuit. The capacitive divider circuit includes first and second inputs, across which, in use, is received a high voltage AC signal and also includes second and third capacitors. First and second plates of each of the first, second and third capacitors are defined by conductive layers of a printed circuit board and the dielectric of each of the first, second and third capacitors being defined by a non-conducting part of the printed circuit board. A compensator circuit has a configurable transfer function and includes an input connected across the first and second plates of the third capacitor and an output. The compensator circuit is operative to change a voltage received at its input in accordance with the transfer function and to provide the changed voltage at its output.

Abstract: A security and driver identification system for use within the commercial transportation industry and which can be applied to private vehicles. The central component of the system is a telecommunications mobile terminal located within the vehicle with primary capability being to positively identify driver and vehicle to facilitate transceiver wireless communications between vehicle and authorized personnel. The telecommunications mobile terminal is preprogrammed with wireless network number, and is accessible and security procedure implemented by biocell phone communication from authorized driver.

Abstract: The present invention is directed toward compounds of Formula (I) as follows: wherein, R is H, R5C(O), R5CH2OC(O), or R5CH2NHC(O); R1 is where the crossing dashed line illustrates the bond formed joining R1 to the molecule of Formula (I); R2 and R3 are independently OH or H, provided that R2 and R3 are not simultaneously OH; R4 is H, R5C(O), R5CH2OC(O), or R5CH2NHC(O), provided that R and R4 are not simultaneously H; and R5 has the general formula: CH3—(CH2)n—(CH?CH—CH2)m—CH?CH—(CH2)k—; k is an integer from 0 to 7; m is an integer from 0 to 2; and n is an integer from 0 to 10, or a pharmaceutical salt thereof. Methods of making and using these compounds are also disclosed.