1258 results about "Multimeter" patented technology

A technical information management device includes an information manager, a data manager, a user interface builder, and a vehicle technical information database. The information manager accesses the database in order to provide a segment of the vehicle technical information to the user interface builder. The data manager receives conditioned input data from a vehicle diagnostic tool and sends it to the user interface builder. The user interface builder includes a graphics generator and a display screen formatter. The graphics generator converts the vehicle diagnostic data into graphical coordinate data and the display screen formatter formats the graphical coordinate data for real time display in a digital multimeter mode or in a scope mode. The user interface builder further can display a dual-display screen wherein half of the screen is a vehicle diagnostic data display and the other half of the screen displays vehicle technical information.

A detector and a variable signal generator are coupled so that one or more specific changes in the output of the detector will cause a change in the characteristics of the generated signal. This change in signal characteristics is non-transient, the change remaining in effect until such time that another change in the detector output causes another change in the signal characteristic. The system can provide remote-end positive wire identification with no additional instrumentation at the remote end. When this invention is embodied in an already existing piece of test equipment, such as a multimeter or time domain reflectometer, there need be no additional hardware instrumentation at either end.

A detector and a variable signal generator are coupled so that one or more specific changes in the output of the detector will cause a change in the characteristics of the generated signal. This change in signal characteristics is non-transient, the change remaining in effect until such time that another change in the detector output causes another change in the signal characteristic. The system can provide remote-end positive wire identification with no additional instrumentation at the remote end. When this invention is embodied in an already existing piece of test equipment, such as a multimeter or time domain reflectometer, there need be no additional hardware instrumentation at either end.

A multimeter with a filtered measurement mode. By pressing a single button or key, a low-pass filter is switched into the signal path to filter voltage spikes, noise, and switching transients from pulse-width modulated pulses, or lower frequency sinusoidal signals with higher frequency components, and at the same time an on-screen icon indicates to a user that the filtered mode has been selected. The user can switch back and forth between filtered and unfiltered modes. The filtered measurement mode is useful in measuring the outputs of modern adjustable-speed motor drives, uninterruptible power sources, and switch power supplies.

The invention discloses a device and a method for phase detection based on a direct type micromechanical microwave power sensor. The device comprises an adjustable digital phase shifter (12), a power combiner (16), the direct type micromechanical microwave power sensor (19) and a digital multimeter (20), a reference microwave signal Vref is connected with a first input port (14) of the power combiner, a to-be-detected signal Vx is connected with an input port (11) of the adjustable digital phase shifter, an output port (13) of the adjustable digital phase shifter is connected with a second input port (15) of the power combiner, an output port (17) of the power combiner is connected with an input port (18) of the direct type micromechanical microwave power sensor, and back holes (8) on the direct type micromechanical microwave power sensor (19) are connected with the digital multimeter (20). The objective of accurate detection of microwave signal phase position is realized by utilizing the method of power after combining a measuring reference signal with the to-be-detected signal after phase shifting by the adjustable digital phase shifter.

A system for planning, performing and / or evaluating the effectiveness of a therapeutic treatment of a target tissue is provided. The system includes at least one of a thermal conductivity probe including a microprobe sensor configured and adapted to measure a thermal conductivity in the target tissue in at least one direction and an electrical conductivity probe including a microprobe sensor configured and adapted to measure an electrical conductivity in the target tissue in at least one direction. The system further includes a multimeter operatively connected to at least one of the thermal conductivity probe and the electrical conductivity probe, the multimeter being configured and adapted to deliver energy to at least one of the thermal conductivity probe and the electrical conductivity probe and a computer operatively connected to the multimeter.

The invention discloses an automatic testing device and method universally used for multiple bus processor modules. The automatic testing device comprises a power supply unit, wherein the power supply unit is connected with an industrial personal computer, a programmable oscilloscope, a programmable power supply and a signal acquisition subdevice; the industrial personal computer is connected with an equipment access box, an equipment adapter box is respectively connected with a multimeter and a digital I / O (Input / Output) control panel, the power supply input end of the equipment adapter box is connected with the power supply output end of the programmable power supply; the industrial personal computer is connected with the programmable oscilloscope, the programmable power supply and a communication board; and the programmable oscilloscope and the programmable power supply are connected with the equipment adapter box. The invention mainly realizes portable mechanical loading of different types of different bus processor modules, automatic loading of closed test programs, automatic testing of performances and breakage and short circuit property tests of all pins of the module. By using test hardware of the automatic testing device and matching developed test software, automatic recognition of the processor modules, automatic loading of the closed test programs, real-time display of performance test results, report output and other functions can be realized.

A multimeter comprising a base unit having at least one test lead terminal. A remote display unit separate from the base unit is also provided. The remote display unit has a display operative to show measured parameters. The multimeter further comprises communication circuitry operative to provide electrical communication between the base unit and the remote display unit. The communication circuitry provides electrical communication in a plurality of alternative communication modes. At least two of the alternative communication modes are preferably wireless communication modes.

A simplified user interface for an electronic test and measurement device comprises an arrangement of a segmented LCD device and a plurality of keys used to implement a softkey system, in combination with a single AMPs input connector and a rotary selector having only a single position for each basic kind of parameter to be measured. The segmented LCD device includes, at each location adjacent to a key, a plurality of segments representing a vertically-arranged list of functions to be controlled. In one embodiment of the invention, the housing of the electronic test and measurement device is fabricated to have finger-like projections overlaying a portion of the LCD screen for creating the appearance of the continuation of displayed LCD softkey separation lines.

The invention discloses an automatic insulation resistance and characteristic resistance tester which comprises a testing cable, a multiplexing switch module, a universal meter module, a CPCI bus and an industrial personal computer. The multiplexing switch module is connected with an electrical node interface of a device to be tested through the testing cable and can control an internal relay switch through programs to enable input channels to be automatically disconnected and connected with an output channel, the universal meter module automatically measure a resistance value of an electrical node of the device to be tested through the multiplexing switch module and outputs a measurement result to the CPCI bus, the industrial personal computer reads data from the CPCI bus and performs processing and displaying. The automatic insulation resistance and characteristic resistance tester can automatically test insulation resistance and characteristic resistance of the electrical node of the device to be tested, the problems including complicated connection in the traditional product checkout process and errors, time waste and the like caused by manual operation are solved, and the tester has the advantages of being high in reliability and accuracy and saving the time.

The invention provides a pressure sensor debugging system and a debugging method thereof. The pressure sensor debugging system comprises a multipath sensor testing pressure seat, a high-low temperature chamber, a pressure controller, a multipath signal switching module, a programmable power supply, a high-precision multimeter, a uniline digital conversion module and an industrial personal computer. The system can realize high-precision pressure calibration and temperature compensation; the work temperature range of the compensated product is wide; the whole debugging process is finished by the system automatically; and the system is suitable for the pressure sensor in volume production to debug.

A digital multimeter adapter for a portable electronic device includes a hardware interface connector and a computer program memory. The memory stores computer program instructions that direct the electronic device to collect data representative of a signal from an external source, analyzing the data to identify a characteristic such as voltage, current, or resistance, and displaying the data in digital format. The user may select one or more of the scales of the display. The adapter also may include a model value database, a collected value database, an application-specific database, and / or a language database.

The invention discloses a conduction insulation test method for a low-frequency cable network, the proposal of testing insulation leakage characteristics comprises that: a certain lead wire is separated from other lead wires in a cable to be tested, other lead wires are short-circuited, and the test of insulation leakage characteristics for the lead wire with respect to other lead wires is completed at a time by using direct current high voltage current generated by a megger. And the proposal of testing low-frequency impedance characteristics comprises that: two adjacent lead wires in the cable to be tested are short-circuited, and the low-frequency impedance characteristics of the two lead wires are tested at a time by using a multimeter. The test method according to the invention has the characteristics of simple and convenient operation, less used tools, high test efficiency and the like, is more outstandingly advantageous for long well-laid cable network and particularly suitable for the requirement of onsite test.

An electrical test instrument comprising a base unit having a first communication address. A remote display unit separate from the base unit and having a second communication address is also provided. Communication circuitry is operative to provide electrical communication in a first RF mode between the base unit and the remote display unit as a bound communication pair based on the first and second communication addresses. The communication circuitry is further operative to operate selectively in a second secure communication mode. The first and second communication addresses are exchanged in the second secure communication mode to establish the bound communication pair for subsequent communication in the first RF mode. In some exemplary embodiments, the second communication mode is an optical communication mode (e.g., an IR communication mode).

A clamp type digital multimeter has one or more digital displays mounted so as to permit at least one of the displays to be read even when attachment of the clamp jaws about a conductor forces the display into an orientation that renders it inaccessible. The meter either has a single display that can be pivoted to an orientation convenient for viewing, or it has dual displays mounted on separate surfaces of the meter's housing. A protective flap may cover one or both of the displays when it is not needed for viewing.

An electrical test lead probe for use with a multi-meter provides for releasable retention in and electrical contact with a terminal of an industrial terminal block. The test lead probe includes a self-adjoining electrically conducting tip that is configured for automatic releasable receipt into a terminal block socket of various styles of terminal blocks, the terminal block socket housing a terminal of the terminal block. The present terminal block probe, in one form, is permanently attached to a multi-meter test lead. In another form, the present terminal block probe is coupled to a modular multi-meter test lead. In yet another form, the present terminal block probe has a removable head incorporating an electrically conducting, self-adjoining tip wherein the body is permanently attached to a multi-meter test lead. In a modular form, a plurality of terminal block probes may be provided each one of which has an electrically conducting tip of a different configuration corresponding to different configurations and / or sizes of terminal block sockets.

A digital multi-meter (DMM) is described which can be inserted into a peripheral device card expansion slot of a personal digital assistant (PDA) to provide the PDA with DMM functionality. The DMM is configurable by configuration data supplied by application software running on the PDA. Configuration of the DMM may include, for example, setting measurement function and input ranges. The DMM internal circuitry measures input signals, digitizes them and supplies them to the PDA for display and / or storage. This allows for a data acquisition unit which combines a DMM with the computing power of a PDA. The PDA may be programmed to display or store data in a multitude of ways, depending on the requirements of a particular application. The combined DMM and PDA may benefit from various other functions of the PDA, for example wireless communication of data to allow remote data logging.

The invention disclosed a multifunctional tester, comprising a digital storage oscilloscope module, a digital multimeter module, a function signal generator module and a frequency meter module, which is characterized in that, the control plate of the digital storage oscilloscope is used as the motherboard of the multifunctional tester, and is provided with a multi-computer communication module and a display calculation module which are used to communicate with the data of the digital multimeter module, the function signal generator module and the frequency meter module and display the calculation. The digital multimeter module, the function signal generator module and the frequency meter module acquire the input commands of users by the communication of the motherboard, interact the output data with the motherboard, and then display the output data by the display screen. The invention has the advantages that the invention provides a multifunctional tester covering the common electronic testing devices acquired by the field monitoring which is convenient for the electronic engineers to do common tests, and sets up a testing platform which is convenient for the electronic engineers to do common tests.

Electronic testing devices such as multimeters, and probes therefor. The probes may have off-device display devices attached thereto. The display devices may be non-detachably attached to the probes. In an aspect, conductive pathways to carry probe signals and display signals may be run in parallel or be integrated and may be coupled with a common port or hole of the electronic testing device. In an aspect, a hinge may be used to attach the display devices to the probes. In an aspect, the display device may be attached to a side of the probe to facilitate viewing of the display by a user.

The invention discloses a soil moisture sensor calibration device and method based on a time domain transmission technology(TDT). A sensor probe mainly consists of a built-in circuit board, a coaxial cable, a copper line and epoxy resin. The calibration device mainly consists of a multimeter, a battery, an organic glass column, an earth pillar, a TDT sensor, an electronic balance, a Marriott bottle (Markov bottle) and an artificial climatic box. According to the calibration method disclosed by the invention, different soil textures can be calibrated to obtain a calibration curve and a relevant parameter as well as obtain a temperature calibration curve so as to better realize temperature compensation. The parameter obtained with the calibration method disclosed by the invention has an important meaning on TDT soil moisture sensor performance evaluation, subsequent perfection and development and practical application.

The invention discloses a system and a method for automatically testing an analog module with a settable input / output (I / O) channel in a programmable logic controller (PLC). The system comprises an upper control computer, a programmable direct current signal source, a digital multimeter, a channel and voltage / current mode switching control plate and a communication interface, wherein the upper control computer sets a testing parameter, issues an instruction to realize output or measurement, receives a test result and makes judgment according to the result; the programmable direct current signal source receives the instruction and the parameter to set the output as a voltage or current mode, sets and outputs a voltage / current signal to an input channel; the digital multimeter receives the instruction to set the measurement as the voltage or current mode, measures the voltage or current signal output by an output channel and returns a measured value to a computer; the channel and voltage / current mode switching control plate switches a test channel and a voltage / current connection mode according to the instruction; and the communication interface transmits the parameter, the instruction and the test result between each device and a tested model. A computer reads the conversion value of the voltage or current measured value of the input channel through the communication interface or transmits a set numerical value to the output channel to convert the set numerical value into a voltage or a current.

The invention relates to a multimeter reading system which solves problems about business unsegregated and failure in remote channel multiplexing. The technical scheme includes that n virtual networksare formed by adopting a system management layer, a remote channel layer, a data acquisition layer and a local communication layer; the n virtual networks are virtualized by m physical networks according to a logical control and physical resource decoupling method, the remote channel and the data acquisition layer in the m virtual networks are multiplexed, and a local channel physical channel isa mixed network adopting a broadband carrier and micro-power wireless communication technology; one physical network includes on business master station, one remote channel network, one physical concentrator and one network forwarding equipment and is applicable to the multimeter reading system.

The invention discloses an automatic optical module send-receive integrated test system, comprising a test device and test software. The test device comprises a signal generating analysis meter, an optical source, an optical attenuator, a spectrometer, an optical power meter, an eye pattern analysis meter, a spectrum analyzer, a digital multimeter, a digital direct-current power supply, an optical module to be tested, a test mother board, a master control PC and joints among the devices; and the test software comprises a communication interface module, an instrument control module, a sending terminal test module, a receiving terminal test module, a digital diagnosis test module, a test process control module, a test specification download module and a data storage module. The automatic optical module send-receive integrated test system has the advantages of effectively improving efficiency, maintaining consistency and accuracy of the test process and reducing influence from manual operation in the test process.

The invention discloses an LED (Light-emitting Diode) backlight drive circuit, a backlight module and a liquid crystal display device. The LED backlight drive circuit comprises a light bar, and a power supply module coupled with the light bar, wherein the light bar is connected with the power supply module through a flexible circuit board; the light bar is also serially connected with a measuring resistance; and test points are respectively arranged on two ends of the measuring resistance. According to the LED backlight drive circuit, the test points are added on the two ends of the measuring resistance, so that a probe of a measuring tool such as a universal meter can be reliably contacted with the test points but can not be easy to contacted with other components, and the reliability of measurement is improved. When an oscilloscope is used for measuring, fine wire conductors can be directly welded on the test points, the test points keep away from a bonding pad of the measuring resistance, short circuit is not easy to occur between wire conductors, the operation is convenient, and the reliability is high.

A multimeter comprising a base unit having at least one test lead terminal. A remote display unit separate from the base unit is also provided. The remote display unit has a display operative to show measured parameters. The multimeter further comprises communication circuitry operative to provide electrical communication between the base unit and the remote display unit. The communication circuitry provides electrical communication in a plurality of alternative communication modes. At least two of the alternative communication modes are preferably wireless communication modes.

The invention discloses a testing system and a testing method for a standby current of a movable terminal; the testing system includes a sampling resistance, a multimeter, a power and a movable terminal which are connected in series for forming a testing loop as well as a data collector connected in parallel with the sampling resistance; the invention further includes a comprehensive measuring device connected with the movable terminal and a shielding box which shields the movable terminal inside the shielding box. During testing, the movable terminal is arranged in a testing network environment and the movable terminal is started into a standby state; then the testing is started, the voltage at the two ends of the sampling resistance connected in series with the movable terminal is collected in real time by the data collector; the voltage data of the whole standby measuring process is preserved; after the measurement is finished, a real time standby current value in the whole standby process is obtained according to the relation formula of the voltage that I is equal to U / R; and the average standby current value during the standby measuring process is further obtained by an integral mean of (1 / t) multiply the integral of f from 0 to t. The invention has the advantages of high technical precision, high flexibility and being capable of tracing the state change of a mobile phone terminal.

The invention relates to an automatic digital multimeter verification system and method based on meter and source integration and application of the system and the method, in particular to an automatic verification system and four meter detecting modes, belonging to the field of computer electronic automation. The automatic verification system mainly comprises an upper computer, digital multimeter automatic verification system software, a three-phase AC / DC (Alternating Current / Direct Current) verification device and an RS232 (Recommend Standard 232) or IEEE488 (Institute of Electrical and Electronics Engineers) communication cable, wherein the upper computer is connected with the three-phase AC / DC verification device through the RS232 or IEEE488 communication cable in a communication manner. According to the automatic verification system, an advanced computer communication technology is developed and utilized, the difficulty in verification of various digital multimeters is solved, and automatic program control, verification data real-time acquisition and automatic verification certificate printing of an output source, a standard meter and the meters to be verified are carried out in the digital multimeter verification process. Fully-automatic verification of the multimeters is realized in China, the verification work of the digital multimeter is automated, standardized and normalized, the working efficiency and the verification accuracy are greatly improved, and the workload of verifiers is reduced.