1250 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.

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.

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 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.

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 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 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.

The invention discloses a self-adapting combiner delay time and synchronous electronic mutual inductor steady state checking device which comprises a signal source used for generating standard signals, an analogue quantity collector; an output end of the analogue quantity collector is coupled into a checking module of a PC, and a combiner of an electronic mutual inductor is coupled into the checking module of the PC by a network card. The checking device is characterized in that the analogue quantity collector is a multimeter plug-in, the PC is internally provided with a test parameter setting module which is used for setting a standard signal source, comprises all the parameters including rated time-delay data and transmits the parameters to the checking module, a test result processing module and a synchronizing pulse generation module which is respectively connected with the combiner of the tested electronic mutual inductor and the high-precision multimeter plug-in. The self-adapting combiner delay time and synchronous electronic mutual inductor steady state checking device can avoid constant phase angle difference caused by rated time delay of the electronic mutual inductor in the test result.

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.

An air vehicle integrated testing system based on a 1553B bus comprises a power distribution conversion module, a direct-current power source, a direct-current power source controller, an alternating-current power source, an alternating-current power source controller, a measurement and control computer, a bus controller, a testing interface adapter, a bus protocol conversion module, an AD collecting module, a digital multimeter, a testing control module, a signal conditioning module and a data interpretation module. Related equipment in a traditional air vehicle testing scheme is integrated sufficiently to form a highly integrated general testing platform, and ground testing for an air vehicle achieves integration, miniaturization and portability assisted by advanced software technologies.

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.

The invention provides a multimeter remote meter reading system. The system comprises at least one wireless multimeters (10,11,...1N) and a remote meter reading device (20); special ID coders are stored in the wireless multimeters (10,11,... 1N), and the wireless multimeters (10,11,...1N) send the ID coders and measurement data to the remote meter reading device (20) through wireless communication; and the remote meter reading device (20) receives, stores and displays the ID coders and the measurement data. The system which allows the remote meter reading to be realized based on the wireless communication technology, corresponding ID coders to be arranged in the multimeters respectively and the remote storage, management and display of the measurement data to be carried out by the ID coders is convenient for workers to carry and operate, and can effectively avoid the confusion of the measurement data.