485results about "Altering measuring range circuits" patented technology

An integrated circuit can have a first substrate supporting a magnetic field sensing element and a second substrate supporting another magnetic field sensing element. The first and second substrates can be arranged in a variety of configurations. Another integrated circuit can have a first magnetic field sensing element and second different magnetic field sensing element disposed on surfaces thereof.

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.

An integrated circuit can have a first substrate supporting a magnetic field sensing element and a second substrate supporting another magnetic field sensing element. The first and second substrates can be arranged in a variety of configurations. Another integrated circuit can have a first magnetic field sensing element and second different magnetic field sensing element disposed on surfaces thereof.

In one embodiment a method of operating a mobile device includes sensing either an orientation or a movement of the mobile device, determining a command based on the sensed orientation or sensed movement, sensing a proximity of an object in relation to at least a portion of the mobile device, and executing the command upon the proximity of the object being sensed. In another embodiment, a method of operating a mobile device governs a manner of interaction of the mobile device relative to one or more other mobile devices. In at least some embodiments, at least one of the mobile devices includes an accelerometer and an infrared proximity sensor, and operation of the mobile device is determined based upon signals from those components.

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.

A system and method for detecting theft of power in an electrical distribution grid. The system may include at least two communicating meters which form a transformer area network, a mechanism for measuring current and voltage at the meters, a mechanism for transmitting the measured current and voltage data to a data center with access to an electric grid database, and a mechanism that analyzes the transmitted data to inter unauthorized taking of electrical power.

A new Utility Meter and Display System for reading and displaying utility usage information within a building structure. The inventive device includes an encasement, a microprocessor within the encasement, a display, a keypad, and a printer within the encasement for printing selected information for the user. The microprocessor is electronically connected to a water meter, an electric meter, a gas meter and a telephone for reading the usage of the various utilities. The printer is electronically connected to the microprocessor for printing out selected screens on the display. The inventive device preferably includes a modem within for receiving billing information from the utility companies for determining the current rates.

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 weak current detection device for radiation detection, which is used for detecting large dynamic weak current and requires recording and displaying measured data in real time. The device comprises a DC power module, a weak current amplifying and I / V switching circuit, an A / D conversion circuit, a central control unit, a range selection switching circuit and a user terminal, wherein the central control unit is used for finishing the functions of data processing, range switching and data communication; and the range selection switching circuit realizes automatic range selection by selecting a feedback channel of a feedback network. The weak current detection device realizes automatic range switching, adopts a T-shaped resistance network structure in a feedback network of the weak current amplification and an I / V switching circuit U2, improves the equivalent resistance of the feedback network and avoids the temperature drift and capacitive reactance influence brought by high impedance generally. Therefore, the technical problems that the conventional weak signal measurement equipment has low range, slow response, low resolution, and the like, so that the precision reaches 0.1pA or below and the resolution is 10fA.

A device for measuring current comprises a magnetic field sensor for measuring the magnetic field produced by a current I flowing through a current conductor and a yoke of a magnetic material with a relative permeability of at least 100. The magnetic field sensor preferably comprises a semiconductor chip with at least one Hall element and an electronic circuit for the operation of the Hall element. The yoke consists of an oblong piece of sheet metal or a laminate of sheet metals with two ends, that has been brought by bending into a form in which the front sides of the ends of the yoke face each other and are separated by an air gap. The ends of the yoke may be flush, tapered, or flayed relative to the width of the yoke.

Provided is a measurement apparatus that measures a current flowing through a load, including a power supply section that outputs a current supplied to the load; a current measuring section that measures a load current flowing between the load and the power supply section; a switch that is connected in parallel with the current measuring section between the load and the power supply section; and a control section that disconnects the switch during measurement of the load current and connects the switch when the load current falls outside of a predetermined reference range.

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 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.

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 current measuring device comprises a first measuring resistor to receive a measurement current, and a first signal amplifier having an input connected to said first measuring resistor and an output to provide a first measurement signal. A second measuring resistor is connected in series with said first measuring resistor, and first voltage limiting means are connected in parallel on the first measuring resistor to branch a first shunt current off when a first limiting voltage is reached on said first measuring resistor. The value of the first measuring resistor is greater than the value of the second measuring resistor A processing unit comprises one such current measuring device.

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.

In one embodiment a method of operating a mobile device includes sensing either an orientation or a movement of the mobile device, determining a command based on the sensed orientation or sensed movement, sensing a proximity of an object in relation to at least a portion of the mobile device, and executing the command upon the proximity of the object being sensed. In another embodiment, a method of operating a mobile device governs a manner of interaction of the mobile device relative to one or more other mobile devices. In at least some embodiments, at least one of the mobile devices includes an accelerometer and an infrared proximity sensor, and operation of the mobile device is determined based upon signals from those components.

An electronic gas sensor signal conditioner which can automatically adapt to a wide variety of commercial off-the-shelf sensors and provide a digital output in a standard, easily used format. The signal conditioner has analog and digital sections. The analog section includes a sensor excitation sub-section and a signal amplification sub-section. The digital section comprises a microcontroller and controls the analog section. The digital section also converts the signal from the analog section into digital form, reads the sensor TEDS (Transducer Electronic Data Sheet), applies calibration constants and converts the signal into a standard, easily readable digital format.

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 relates to a current measurement device, in particular to a DC current measurement device, which comprises a leading-in end 251, a control part 255, a switch part 252, a sampling part 253 and a measuring part 254. The sampling part 253 is provided with a sampling end 262, a sampling end 263 and a sampling end 280, the switch part 252 comprises a switch 282 for controlling the connection or disconnection of a circuit between the leading-in end 251 and the sampling end 262 and a switch 283 which is used for ensuring the connection between the leading-in end 251 and the sampling end 263 or the sampling end 280. The sampling part 253 comprises a current-voltage transforming circuit 265 between the sampling end 280 and the measuring part 254, and the current-voltage transforming circuit 265 is controlled by the control part 255 to be connected or disconnected. When the switch 282, 283 or 276 changes, the leading-in end 251 of the current measurement device is free from the instantaneous circuit break phenomenon, so the measured circuit can be effectively protected; and moreover, the control method is simple, and the work is stable.

In an electrical circuit for testing electrical current using a plurality of precision resistors connected in parallel or in series, a range finder for receiving the current to be measured with the voltage drop across the range finder being indicative of a current sub-range for measurement. In a preferred embodiment, a range finder has a first bipolar transistor and a second bipolar transistor connected in parallel and in opposite polarity with the emitter and base of each transistor connected together whereby each transistor functions as an emitter-base diode.

A boat indicator enables a user to easily read engine speeds for boats which can switch between a low-speed trolling mode and a normal running mode at speeds higher than the trolling mode speed. The boat indicator includes an engine speed indicating section for indicating engine speed. The engine speed indicating section is adapted to switch between a normal mode display for indicating the engine speed over a relatively large range when the boat is in the normal mode and a trolling mode display for indicating engine speed over a relatively small, low-speed range when the boat is in the trolling mode. The normal mode display indicates engine speed detected with a first resolution over the large range. The trolling mode display indicates engine speed detected with a second resolution finer than the first resolution over the smaller range.

The invention provides a checking device, a checking device correcting method and a checking method thereof. In the checking device for checking objects of sensor panel, etc, correction for an error caused by factors of parasitic capacitance of a cable, etc. can be realized, and furthermore small static capacitance of the sensor panel can be measured in a fine precision. On condition that the sensor panel is detached, the correcting part (46) of a sensor panel checking device (1) supplies an AC signal of a signal part (11) to at least one in a plurality of second cables (37), and furthermore voltage and phase of an AC power supply which corresponds with a galvanometer are adjusted in a correcting signal part (42), so that output of the galvanometer of a current detecting part (41) which is electrically connected with a first cable (36) is kept to zero. If the output of the galvanometer is zero, the voltage and the phase of the AC power supply are stored. In checking the sensor panel, based on the stored voltage and phase, the AC power supply of the correcting signal part (42) is made to generate the AC signal.

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 multichannel voltage collecting device and method. The device of the invention comprises filtering discharge units, multichannel switching units, logic control units and processor units, wherein the number of the filtering discharge units is the same as that of voltage modules to be detected, and the filtering discharge units are respectively connected with the voltage modules to be detected; the multichannel switching units are connected with the filtering discharge units; the logic control units are respectively connected with the multichannel switching units and is used for generating channel switching control signals for the multichannel switching units to carry out voltage collecting channel switching control; and the processor units are respectively connected with the multichannel switching units and the logic control units and is used for processing the collected voltage and controlling the logic control units to generate the channel switching control signals. In the invention, by filtering the output voltage of a power supply module to be detected, when in in transmission, space common mode interference and line transmission interference born by the output voltage of the power supply module to be detected are eliminated; and by switching on and switching off an optical coupler relay control channel, the invention has the characteristics of fast velocity response, short stabilization time, good linearity and long service life.

The invention discloses a current detecting device and method, relating to the field of power electronics. According to the invention, the purpose that one manufactured board is used for detecting current values of different ranges is achieved; the kinds of the manufactured boards are reduced; and therefore, the cost of production, management and maintenance is reduced. The current detecting device comprises a current sensor, a first to an Nth loading units, a controller and an AD(Analog-to-Digital) detecting unit, wherein N is a natural number of 2 or more than 2; the controller is used for respectively controlling switching on or switching off of first to the Nth switching units when the value of detected current belongs to different detecting ranges so that the first to the Nth resistance units form loads adapting to the detecting ranges; the detecting ranges are divided according to the value of the detecting current; and the AD detecting unit is used for sampling the voltage of the loads formed by the first to the Nth resistance units to obtain a load voltage value and computing to obtain the value of current to be detected according to the load voltage value.

A direct current measuring device comprising at least one first magnetic sensor and at least one second magnetic sensor sensitive to a magnetic field generated by an electric current flowing in a conductor. The measuring device comprises a processing unit connected to the magnetic sensors and designed to generate an output signal dependent on the measurement signals supplied by the magnetic sensors. Said processing unit comprises selection means supplying the output signal dependent, for weak electric currents on the first measurement signals from at least one first magnetic sensor, and dependent, for strong electric currents, on the second measurement signals from at least one second magnetic sensor.

A device for measuring current comprises a magnetic field sensor (2) for measuring the magnetic field produced by a current I flowing through a current conductor (1) and a yoke (3) of a magnetic material with a relative permeability of at least 100. The magnetic field sensor (2) preferably comprises a semiconductor chip with at least one Hall element and an electronic circuit for the operation of the Hall element. Two magnetic field concentrators (7, 8) separated by an air gap (6) are arranged on a surface of the semiconductor chip such that field lines (9) of the magnetic field (see FIG. 3) that issue from the first magnetic field concentrator (7) in the vicinity of the air gap (6) and impinge on the second magnetic field concentrator (8) in the vicinity of the air gap (6) pass through the at least one Hall element. The yoke (3) consists of an oblong piece of sheet metal or a laminate of sheet metals with two ends (10, 11) that has been brought by bending into a form with which the front sides of the ends (10, 11) of the yoke (3) lie opposite each other and are separated by an air gap (14). The ends (10, 11) of the yoke (3) are tapered so that a width of the ends of the yoke is less than a width of the yoke.

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.