815results about "Multi-tester circuits" patented technology

A method for continuously controlling color of a display device comprises the steps of receiving three sets of data respectively representing the portions of three primary colors, accumulating three counts in accordance with the data, respectively, and setting three bistable devices for the respective durations of the accumulating. The outputs of the three bistable devices are coupled for respectively energizing three buses, to which the light emitting diodes of three primary colors are connected in accordance with their colors, for controlling the portions of the light signals of the primary colors emitted therefrom.

The hand-held portable tester provides an improved system and method for testing storage batteries, vehicle starting systems and vehicle charging systems. The system and method more accurately calculates tests results for multiple types of storage batteries. The system and method provides a convenient charging system test that is completed at a single engine speed. In addition, the hand-held portable tester provides a coded or encrypted output for battery tests that can be identified with the battery to ensure compliance with battery return policies and detour fraud. A system and method of decoding or decrypting the output is also provided.

A combined AC / DC monitoring system simultaneously monitors an AC power supply and a DC power supply in a mobile unit. The monitoring system is electrically isolated from an AC input source through an AC isolation transformer. A microcontroller digitally provides various computed variables from various digitized input signals. The monitoring system simultaneously displays a plurality of the computed variables while the system monitors for various user-selected high / low conditions of the computed variables. The system monitors AC power surges and can alternately displays a high voltage level for a predetermined time and a low voltage level for a predetermined time. An algorithm determines whether the AC voltage is a true sine wave or otherwise. The system monitors DC current on the high side, or positive terminal, of a battery. User selectable DC shunts are provided to measure a range of DC currents.

Enhanced voltmeter leads includes load circuitry having a test load that can be switchably coupled between the leads to help identify faults in a circuit under test. In certain embodiments, the value of the test load can be any appropriate value set according to parameters or characteristics of the circuit under test. In these embodiments, the value of the test load can be set manually or automatically or both. The types of faults that can be identified include a short-to-ground, an open circuit, and a high (e.g., corrosive) resistance. The leads include a switch whose setting is adjustable to couple and decouple the test load between the leads. The switch can be located in the leads or in a lead handle of the leads for easy access by a user / technician. The leads can also include a fuse or circuit breaker for safety reasons. The leads can be used systematically to help identify the type and location of a fault from voltage readings. The voltage readings are obtained at various points in the circuit under test with the switch both closed and open. Conventional test leads or the leads that include the switch to couple / decouple the test load can be used if the load circuitry is integrated into the voltmeter or if the load circuitry has a separate coupling or connection to the voltmeter inputs.

A power meter has a measuring circuit composed entirely of analog components that measures the instantaneous current draw of one or more electrical devices, such as home appliances. The power meter may be in the form of a hand-held device that includes elongated connections that allow a homeowner to measure the current draw of an electrical device without significant displacement of the electrical device. In addition to measuring current draw, the power meter may provide an estimated wattage consumed by the measured electrical devices.

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 meter stand is provided for holding a meter such as a multi-meter. In general, the meter stand includes an arm assembly detachably connected to a base member. The arm assembly includes a meter attachment assembly for holding the meter, a first arm attached to the meter attachment assembly, and a second arm hingedly connected to the first arm. The second arm also includes a socket attachment that detachably connects the arm assembly to the base member. In one embodiment, the base member is a magnetic base member. In another embodiment, the base member includes a clamp assembly. In yet another embodiment, the base member includes a stand assembly. The stand assembly can be used to support the meter stand on a substantially flat surface or a vertical surface or used in combination with a neck strap to support the meter stand around a user's neck.

Processes and apparatuses are provided for contactless measuring or monitoring in-situ and in real time composition or other electromagnetic impedance correlated properties of liquid or gaseous substances or bulk materials. One or more apparatus may include a resonance type impedance sensor having at least two coils, at least one coil of the at least two coils being at least one excitation coil connectable to at least one alternating current source with frequency sweep, at least one other coil of the at least two coils being at least one sensing coil connectable to at least one data processing system. The one or more methods may include calculating changes in amplitude and resonant frequency induced by electromagnetic interaction between said sensor and object to determine impedance of said object under test; and matching said impedance with predetermined calibration data to determine said chemical or physical properties of said object under test.

Systems and methods provide measurement of alternating current (AC) electrical parameters in an insulated wire without requiring a galvanic connection between the insulated wire and a test probe. Measurement systems or instruments may include a housing that includes both a non-contact voltage sensor and a non-contact current sensor. The measurement system obtains measurements from the voltage sensor and the current sensor during a measurement time interval and processes the measurements to determine AC electrical parameters of the insulated wire. The AC electrical parameters may be presented to an operator via a visual indicator device (e.g., display, lights). The AC electrical parameters may additionally or alternatively be communicated to an external device via a wired and / or wireless communications interface. The measurement system may include an alignment feedback sensor that provides feedback to a user regarding the mechanical alignment of the insulated wire relative to the voltage sensor and the current sensor.

Broadly, the present invention is an electrical test apparatus that is adapted to be removably engaged and in electrical communication with an electrical power terminal, the electrical test apparatus includes analytical circuitry that is operative in each of a plurality of modes to monitor the electrical power terminal and produce a plurality of event marker signals. Further included is a criterion circuitry that is operative in each of the plurality of modes to receive each of the plurality of event marker signals for a comparison with a selected value for each of the plurality of modes, wherein the criterion circuitry outputs a plurality of perceptive signals each corresponding to one of the plurality of modes. In addition, a structure is included for producing an associated perceptible output in response to each of the plurality of perceptive signals.

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.

A portable harmonics measurement instrument performs in-situ self-calibration of its current transducers and their associated measurement channels and of its voltage probes and their associated measurement channels. In-situ self-calibration is performed immediately before making a measurement on the alternating current power distribution grid. In-situ self-calibration is performed by means of a built-in voltage reference source and a built-in current reference source, which generate highly-accurate voltage and current calibration waveforms with harmonic components.

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 belongs to the field of conductive polymer composites pressure-sensitive materials and particularly relates to a preparation method of a porous conductive polymer material with pressure-sensitive property and an application thereof. The preparation method of the porous conductive polymer material with pressure-sensitive property comprises the following steps: a) suspension preparation; b) unidirectional freezing; and c) low-temperature low-pressure drying. The porous conductive polymer composite with pressure-sensitive property prepared in the invention has excellent stability and resilience and can be used for preparing a light polymer-based strain sensor; and by combining the obtained conductive polymer composite with the circuit board and semiconductor technology, various pressure-sensitive sensors with good stability and long service life can be made.

The present invention relates to a sine signal four parameters detection method and a virtual instrument signal detection device. The device consists of a signal modulating unit, a data acquisition unit, a microcomputer and a signal processing unit. The signal generated by a sensor and a signal source is modulated. An analog sine signal is sampled and quantized into a digital signal by a data acquisition card. The digital signal is sent to a computer via a data interface. With the signal detection method of the present invention, FFT conversion is carried out for two continuously sampled signal series respectively. The spectrum peak values of the direct current amount and the alternating current amount of the signal are respectively extracted with the application of the frequency-selecting property of the FFT. With precise phase correction and frequency correction, the amplitude, the frequency, the phase (difference) and the direct current component parameter of the sine signal are accurately measured. Afterwards, the signal wave pattern, the spectrogram and the measuring result are outputted via a display. The dynamic measuring result is preserved to be a data document.

Techniques are provided for performing full N-port calibrations in an environment in which a test set is used to connect an N-port DUT to an M-port VNA, where N>M. Techniques for incorporating port impedances as part of a calibration sequence are provided. Also provided are techniques for using sequential characterization and de-embedding to generate virtual calibrations that are then used in a renormalization process.

A Wireless Clamp-on Current Probe and an embedded system which includes a digital RF transceiver allows for remote test and measurement equipment to receive data from a current probe without regard to cabling issues such as size, physical wear, weight, cost, electrical noise, losses and more. Such a current probe may be used in environments and situations not previously explored. The probe may be controlled and queried by wired serial communication means or by means of an integrated radio frequency (RF) transceiver. The RF transceiver may utilize a proprietary communication protocol or a standard wireless communication protocol such as ZigBee, Bluetooth or any of the IEEE communication standards.

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 discloses an electronic measurement method, which comprises multiple electronic measurement functions, and also comprises that: a hardware platform consisting of DSP and FPGA development modules, a software platform consisting of muclinux and GUI development modules, and a system power supply supplying power for hardware modules are set; analog signals are input from an analog front end, converted into digital signals by a sampling module, processed by an FPGA internal cache and sent to a DSP for operation processing, and finally a result is transmitted to a TFT LCD display for display and output; the DSP calls signals generated by a signal generating module in an FPGA and calls out the digital semaphore to a signal output module, and the signals are output after smooth filtering by an analog back end; a muclinux operating system is utilized to be responsible for monitoring human-computer interfaces, and executes corresponding function tasks according to user instructions; and the muclinux operating system calls corresponding hardware module drivers according to different tasks so as to realize required functions through the hardware modules.

The invention relates to a self-calibrating method of internal reference resistors of a multi-range digital electronic measuring instrument, comprising the following steps of: on the basis of the design line of the traditional digital electronic measuring instrument, additionally setting an electronic switch and a self-calibrating program; setting a resistor with good long-term stability as an internal standard resistor in a set of internal reference resistors; when in a self-calibrating state, controlling the electronic switch by using the self-calibrating program to form different combinations so as to obtain comparing and measuring circuits among different reference resistors; and respectively and directly or indirectly comparing the reference resistors with the set internal standard resistor to measure respective actual resistance values and storing the actual resistance values in an internal storage for automatically correcting measuring results. Because only one standard resistor with good long-term stability needs to be adopted, other reference resistors are compared and calibrated with the standard resistor, and the method effectively reduces the requirements of other reference resistors, is beneficial to reducing the production cost and ensuring the measuring precision of each measuring process so that the calibration in the production process and the periodic calibration of users both are simpler and more effective and accurate.

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 relates to an electric power measurement multifunctional instrument system and a method for measurement. The electric power measurement multifunctional instrument system comprises an electric power measurement module for acquiring and measuring external three-phase voltage and current and transmitting measurement data to a microprocessor module, an LED driving module for driving an LED display screen, the LED display screen for displaying the measurement data output by the microprocessor module, an input module for acquiring input switching value and / or keystroke input value for the microprocessor module, an output module for outputting and performing switching in, switching off, CT overload current warning, and the like to a relay, a storage module for meeting requirements on storing system setting parameters, accumulated electrical degree value and standard check value of the electric power measurement module, and the microprocessor module for performing control operations of initializing the system, responding to timer interruption, reading electric quantity data, storing set data, displaying the electric quantity data, and the like.

This invention provides an intelligent synthesized electronic gauge. It integrates the storage oscillograph, digital frequency meter, signal generator, RLC detecting device, two-circuits stabilized voltage supply which are commonly used for electric experiment with the technology of microprocessor, EDA and flat display. It also adopts the colorful liquid crystal display (LCD) and the grade menu operation of touch screen to realize intelligent detecting. It has the merits of integrated function, an integrated unit of storage oscillograph, digital frequency meter, signal generator, RLC detecting device, two-circuits stabilized voltage supply which are commonly used for electric experiment, on-line update of the device via programmable logic device which is convenient for the production update. It also supports TFT high- resolution LCD with the technology of flush-bonding MPU providing touching screen control to make the device screen of high-definition and simple operation.