Abstract: A pattern sequence and state transition trigger generator provides a trigger when a specified transition from one pattern/state to another pattern/state occurs in a set of input signals. Decoders detect each specified pattern/state from the set of input signals to produce a prior value and a current value representing the transition. The prior value is slightly delayed and combined with the current value to produce an overlap when the specified transition occurs, which in turn generates the trigger.

Abstract: Position Lock Trigger apparatus employs oscilloscope circuitry and accompanying control software to provide to a user the capability to trigger an oscilloscope on a selected bit position in a received serial bit stream having a fixed pattern length, using either a synthesized, recovered, or external clock source. The selected trigger position can be moved forward and backward along the serial bit stream by one or more serial bit positions at a time in order to examine the entirety of the fixed pattern length serial bit stream, with or without regard to the actual bit sequences occurring in the serial stream.

Abstract: A polymeric chair having a rebar cradle and legs of a T-shaped cross-section diverging downwardly from the cradle. The outer surface portions of the legs are arcuate and define segments of a cone. Inwardly extending web portions reinforce the legs and provide feet at the distal ends of the legs disposed to the inside of the outer surface portions. A flat sand plate for the chair has radially extending slots formed therethrough which are proportioned for snug engagement with side surfaces of the feet. The slots are elongate to accommodate different sized chairs having feet spaced at varying radial dimensions. The web portions taper to optimize their reinforcing function and conserve material. In one embodiment, a ring is formed integrally with the legs intermediate the table and the distal ends of the legs. The chair is of a unitary construction and may have an integrally formed strap for extension over the cradle to secure a rebar in place.

Abstract: First and second cast-in-place concrete slabs are maintained in alignment by cutting a semi-circular groove in an edge surface of the first formed slab, positioning a flat rectangular dowel within the groove so that the dowel extends outwardly from the edge surface, and then casting the second slab against the edge surface to embed the dowel within the second slab. A gasket is engaged with the dowel to seal the groove against the intrusion of fluid concrete as the second cast-in-place. The gasket also serves to space the dowel from the groove to accommodate limited lateral movement of the dowel and groove relative to one another.

Abstract: First and second cast-in-place concrete slabs are maintained in alignment by cutting a semi-circular groove in an edge surface of the first formed slab, positioning a flat rectangular dowel within the groove so that the dowel extends outwardly from the edge surface, and then casting the second slab against the edge surface to embed the dowel within the second slab. A gasket is engaged with the dowel to seal the groove against the intrusion of fluid concrete as the second cast-in-place. The gasket also serves to space the dowel from the groove to accommodate limited lateral movement of the dowel and groove relative to one another.

Abstract: An assembly for use in the formation of adjacent concrete slabs to provide a flat rectangular dowel engaged between the slabs. The assembly comprises a pocket which is cast in place in the edge portion of the first slab to be formed, with the dowel fully confined within the pocket. After the formation of the first slab, the dowel is partially withdraw from the pocket and the second slab is formed in place against the first slab, with the dowel in spanning relationship to the respective slabs. In the preferred embodiments, the pocket comprises a monolithic plastic box having complimental generally rigid upper and lower sections movable between a closed condition defining the pocket therebetween and an open condition exposing the pocket interiorly. One edge of the pocket is formed with an opening through which the dowel passes as it moves between the fully confined and the partially withdrawn positions.

Abstract: An advanced trigger circuit includes two trigger decoders, each triggering on one of respective pluralities of continuous-time trigger events. In one embodiment, a programmable timer begins timing in response to an output signal of the first trigger decoder and generates an end-of-time signal at the expiration of its time period. A reset circuit resets the first trigger decoder if the second selected continuous-time trigger event failed to occur before the end-of-time signal was generated. In another embodiment, a reset decoder generates a reset signal in response to an occurrence of a selected continuous-time trigger event. The reset circuit is responsive to the reset signal for resetting the first trigger decoder if the second selected continuous-time trigger event failed to occur before the reset signal was generated. In other embodiments, the advanced trigger circuit triggers on a serial lane skew violation or on a beacon width violation.

Abstract: A system includes a plurality of digital storage oscilloscopes (DSOs) in which each DSO requires a respective temporal portion of a signal under test (SUT) according to a synchronized triggering signal and respective post-trigger count periods such that a plurality of acquisition records may be concatenated to produce a longer acquisition record.

Abstract: A masonry lintel having a concealed spine which spans between piers to either side of an area to be arched and supports masonry bricks through means of horseshoe shaped plates which ride on the spine. The bricks are supported on the spine by stitching rods which extend through apertures in the plates and the bricks. The plates are received in the grouting space between the bricks and, in the finished lintel, are grouted over to be completely hidden from view. Variations in the relative positions of the piers and the width of bricks used to construct the lintel are accommodated by adjustable supports between the spine and the piers which enable the position of the spine relative to the piers to be selectively adjusted. In the embodiments employing multiple generally parallel spines, these supports provide for adjustable spacing of the spines. Center supports for the spines are adjustable both vertically and horizontally to accommodate various structural design parameters.

Abstract: A system comprising a plurality of digital storage oscilloscopes (DSOs) in which each DSO acquires a common signal under test (SUT) according to respective clock signals having common frequency parameters and respective phase parameters such that a plurality of acquisition records may be interleaved to produce a higher effective resolution acquisition record.

Abstract: A system comprising a plurality of digital storage oscilloscopes (DSOs) in which each DSO acquires a common signal under test (SUT) according to respective clock signals having common frequency parameters and respective phase parameters such that a plurality of acquisition records may be interleaved to produce a higher effective resolution acquisition record.

Abstract: A system comprising a plurality of digital storage oscilloscopes (DSOs) in which each DSO requires a respective temporal portion of a signal under test (SUT) according to a synchronized triggering signal and respective post-trigger count period such that a plurality of acquisition records may be concatenated to produce a longer acquisition record.

Abstract: An apparatus and method of providing a retrofit dowel to maintain adjacent concrete structures in alignment. The dowel is received in a longitudinal groove cut across the structures, and supported in spaced relationship to the bottom of the groove by feet on caps engaged over the ends of the dowel. The feet are positioned so as to be disposed to either side of the dowel. Wings extending laterally of the end caps engage the sides of the groove to center the dowel within the groove and secure it in place. The end caps include structure to secure them from inadvertent displacement from the dowel and stops to provide expansion space to the ends of the dowel, and are translucent to enable the position of a dowel received therein to be visually observed.

Abstract: A system and method for controlling the operating parameters of a laser diode (20) is provided. The laser control system (10) automatically optimizes the laser diode (20) operating characteristics while maintaining a safe peak power for pulse duration and pulse repetition frequency (PRF). The controlled level of output power is based on the laser diode gain determined during calibration of each laser diode projector as well as using the application of predetermined laser safety formulas. The laser control system (10) includes a laser diode (20) that is powered by a laser drive current. The laser diode (20) has a laser output having a peak power level. A detector (28) is coupled to the laser diode (20) for sensing the laser output. A laser driver (18) including a primary control loop (44) is operable, in response to the sensed laser output and a reference (43), to control the laser drive current such that the output power corresponds to the reference (43). A controller (52) is coupled to the laser driver (18).

Abstract: Ultra-small optical probes comprising a single-mode optical fiber and a lens which has substantially the same diameter as the optical fiber. The optical fiber and lens are positioned in a probe housing which is in the form of an insertional medical device such as a guidewire. Connector elements are provided to facilitate the attachment of the probe to an optical system and the quick disconnection of the probe from the optical system. The probe is used to obtain optical measurements in situ in the body of an organism and can be used to guide interventional procedures by a surgeon.

Abstract: A slotted insert having a U-shaped frame and a plastic nut box forms a concrete cone having a depth which is substantially equal to the height of the insert by utilizing tapered feet. The interior sidewalls of the U-shaped frame are formed with indentations or through holes, and the plastic nut box is formed with first projections that are in register with and held by the indentations or through holes. As a result, assembly of the nut box into the frame is accomplished by snapping the nut box into the frame. The nut box, which is also formed with a second projection that fits within the slot of the insert, is formed from a lid that is plastic welded to an open box.

Abstract: A support member for a concrete structure comprises a Y-shaped hollow insert defining an internal channel having a Y-shaped cross-section. A V-shaped nut is inserted in V-shaped portion of the internal volume and end caps are placed over the ends of the insert to fully enclose the internal volume. The insert is then placed within a form for a concrete structure such that the base surface of the Y-shaped insert will be coplanar with a surface of the concrete after the concrete has been poured into the form and set. The base wall of the insert is then removed, thus exposing the internal volume. The distal end of a bolt can be inserted into the insert and fixed to the nut. The proximal end of the bolt extends out of the insert and beyond the surface of the concrete to be attached to equipment or another structure which is to be supported on the concrete structure.