40 results about "Digital instrumentation" patented technology

A test system with multiple instruments. Some instruments act as controller instruments and others act as controlled instruments. Each instrument includes a clock generator that synthesizes one or more local clocks from a reference clock. The reference clock is a relatively low frequency clock that can be inexpensively but accurately generated and distributed to all of the instruments. A communication link between instruments is provided. Timing circuits within instruments that are to exchange time information are synchronized to establish a common time reference. Thereafter, instruments communicate time dependent commands or status messages asynchronously over the communication link by appending to each message a time stamp reflecting a time expressed relative to the common time reference. The test system includes digital instruments that contain pattern generators that send command messages to analog instruments, which need not include pattern generators. The architecture simplifies design of analog instruments and avoids redesign of analog instrument as pattern rates of digital instruments change.

A test system with multiple instruments. Some instruments act as controller instruments and others act as controlled instruments. Each instrument includes a clock generator that synthesizes one or more local clocks from a reference clock. The reference clock is a relatively low frequency clock that can be inexpensively but accurately generated and distributed to all of the instruments. A communication link between instruments is provided. Timing circuits within instruments that are to exchange time information are synchronized to establish a common time reference. Thereafter, instruments communicate time dependent commands or status messages asynchronously over the communication link by appending to each message a time stamp reflecting a time expressed relative to the common time reference. The test system includes digital instruments that contain pattern generators that send command messages to analog instruments, which need not include pattern generators. The architecture simplifies design of analog instruments and avoids redesign of analog instrument as pattern rates of digital instruments change.

A nuclear instrumentation and control system, comprising: an input module, receiving analog inputs from sensors and digital signals from hardware switches; a dual redundant bi-stable processor, connecting to the input module; a dual redundant local coincidence logic processor, connecting to the dual redundant b0-stable processor; an output module, connecting to the dual redundant local coincidence logic processor; an integrated communication processor, connecting to the dual redundant bi-stable processor and the dual redundant local coincidence logic processor; an interface and test panel, connecting to the dual redundant bi-stable processor, the dual redundant local coincidence logic processor and the integrated communication processor; and a video display unit, connecting to the dual redundant bi-stable processor, the dual redundant local coincidence logic processor, the integrated communication processor and the interface and test panel. Thereby, a qualification and certification tools for design and development of safety related equipment and explains the basis for many decisions made while performing the digital upgrade.

A test system using direct digital synthesis for generation of a spectrally pure, agile clock. The clock is used in analog and digital instruments in automatic test system. A DDS circuit is synchronized to the tester system clock because it is clocked by a DDS clock generated from the system clock. Accumulated phase error is reduced through the use of a parallel accumulator that tracks accumulated phase relative to the system clock. At coincidence points, the accumulated phase in the DDS accumulator is reset to the value in the system accumulator.

A substantially self-contained digital instrumentation module (30) for fixed and rotary wing aircraft provides flight and other situational information, such as attitude, altitude, airspeed, and slip information, during normal aircraft operation or during emergencies, such as a failure of the aircraft's primary instrumentation. The module (30) can be mounted in any of various possible orientations. It includes redundant memories (38,40,50,52) to preserve back-up copies of software and settings during upgrades and changes. It partitions certified software from non-certified software. It can receive software upgrades and settings changes via a common portable memory device. It can automatically calculate and synchronize barometric pressure with the aircraft's primary instrumentation. It also allows for creating a customizable dimming curve (220,222), and for creating customizable range markings (114).

The present invention relates to a digital instrument for use in physical therapy, including a gripping force measurement bar which measures the gripping force of a hand when the bar is grasped, a sensor portion which measures the rotation of a wrist when the wrist is turned while the gripping force measuring bar is grasped, a display device which visually displays the degree of the gripping force or the extent to which the wrist is rotated, and a memory portion which stores the degree of the gripping force of a measured value relating to the rotation of the wrist. The invention also relates to a physical therapy method using the instrument. According to the present invention, the degree of motion is assessed on a real-time basis, the degree of motion is easily controlled, and an exercise activity is rendered more interesting since the degree of the gripping force or the extent to which the wrist is rotated is measured and visually displayed.

The invention relates to a multifunctional input/output interface board, which comprises an optoelectronic isolation input circuit, a logic control circuit, a display and communication circuit, and an output control circuit, wherein the optoelectronic isolation input circuit consists of an optoelectronic isolator and a light-emitting diode connected in series, the input end of the optoelectronic isolation input circuit is connected to an external sensor, and the optoelectronic isolation input circuit is used for performing anti-interference filtration and noise reduction treatment on input external signals; the logic control circuit receives signals processed by the optoelectronic isolation input circuit to realize input/output control; the display and communication circuit receives control signals of the logic control circuit and performs parameter configuration and communication with external equipment; and the input end of the output control circuit receives the control signals of the logic control circuit and the output control circuit outputs switch control signals to on-site external serial-port equipment. The multifunctional input/output interface board can be used for signal input of various sensors, automatic control of switch signals and communication interfaces with digital instruments on industrial site, and solves the problems that interface signal levels on the industrial site are not matched or common-grounded, interference of the various noise signals in the prior art is not eliminated, and the like.

The invention discloses a handheld neurologic function evaluation device. The device comprises a host, a sleeve and a hard template, wherein the host comprises a liquid crystal screen, an accelerometer, a gyroscope and a data processing circuit; the host is fixedly bound on the far end of an arm by virtue of the sleeve; the hard template is provided with a spiral line. When the device is used, the hard template is put on a table flatwise, and arms of a patient are suspended; a single finger of the patient touches the hard template and rotates once from the inside to the outside along a track, and then rotates once from the outside to the inside; the track of arm movement is obtained by calculation of the accelerometer and the gyroscope; and the data processing circuit performs power spectrum analysis to the track of arm movement, and sends out a report of the degree of tremor through the liquid crystal screen, so that the degree of tremor is judged. The handheld neurologic function evaluation device can be used as a portable noninvasive digital instrument for evaluating movement function abnormality (such as Parkinson's disease and the like) and is convenient to use, operate and carry.

The CPU includes: a data transmission instruction output processor; a failure detection signal input processor to which a failure detection signal is input from a failure detection processor for detecting a failure of an input unit; a data storage memory for, each time an input data update processor of the input unit updates data, storing the updated data; and a CPU operation processor for obtaining input data from the data storage memory and obtaining a detection signal from the failure detection signal input processor to perform operation processing. The CPU operation processor obtains periodic data as of an amount of time given by the following expression ago:

{ROUNDUP(T₂₂/T₁)}×T₁

where T₂₂ is the failure detection processing time of the failure detection processor, T₁ is the data transmission instruction output period of the data transmission instruction output processor, and ROUNDUP is a function of rounding up to the nearest integer.

A test technique may be implemented in an automated test system for testing semiconductor devices. The test technique may enable the fast detection of a signal transition, such as an edge, within a waveform and the timing of that event. Circuitry within a digital instrument that can be quickly and flexibly programmed may, at least in part, implement the test technique. That circuitry may be simply programmed with testing parameters, such that application of the technique may lead to faster test development and faster times. In operation, that circuitry receives parameters specifying parameters of a window over a waveform in which samples of the waveform will be taken to detect the signal transition. The circuitry may convert these parameters into control signals for other components in the test system, such as an edge generator or pin electronics, to take a programmed number of samples at desired times.

The invention relates to an elimination method of clock jitter in a radio frequency direct band pass sampling digital receiving system. The method realizes elimination of the clock jitter in the radio frequency direct band pass sampling digital receiving system through adopting the non-uniform sampling output value of the radio frequency direct band pass sampling digital receiving system, the band pass sampling theory, the digital down-conversion theory and the feature of the radio frequency direct band pass sampling digital receiving system. The method can select different cascading series according to an actual radio frequency direct band pass sampling digital receiving demand so as to satisfy the demanded clock jitter elimination performance. The method of the invention is low in actual realization complexity and good in elimination effect, is easy for a hardware to realize, imposes no restriction on the type of the input signal of the radio frequency direct band pass sampling digital receiving system and is especially suitable for application of the radio frequency direct band pass sampling digital receiving system in modern communication, radar and high precision digital instrument.