Abstract: The disclosed technology relates to a probe for use with a test and measurement instrument. The probe includes a digital multimeter or voltmeter with an analog-to-digital converter configured to measure a signal from a device under test and determine a digital measurement from the signal, a controller connected to the multimeter or voltmeter configured to receive the digital measurement from the multimeter or voltmeter, a digital communication interface connected to the controller configured to communicate with the controller, and a communication link connected to the digital communication interface and the analog signal interface to communicate with the test and measurement instrument.

Abstract: An electronic component includes a component enclosure. At least one subcomponent is positioned within the component enclosure. The at least one subcomponent is configured to be thermally coupled to the component enclosure.

Abstract: In one aspect, a portable handheld measurement device automatically stores measurement values in volatile memory in a limited replay storage mode that comprises a storage limitation that applies to the plurality of measurement values stored in the limited replay storage mode; receives a replay request; and, responsive to the replay request, presents at least some of the measurement values stored in the limited replay storage mode. In another aspect, a portable handheld measurement device automatically stores measurement values and associated contextual data according to a persistent storage mode; and automatically stores the measurement values according to a limited replay storage mode, wherein the limited replay storage mode comprises a storage limitation that is not present in the persistent storage mode.

Abstract: An active shunt source-measure unit (SMU) circuit can include an SMU or power supply having an active shunt circuit that is integrated with the current measuring sub-circuit of the SMU circuit. The active shunt circuit may be active during voltage sourcing of the SMU circuit and deactivated during current sourcing of the SMU circuit.

Abstract: According to the present invention, a signal display device includes: a first characteristic value measurement unit, a display unit, a second characteristic value measurement unit, and a display form changing unit. The first characteristic value measurement unit measures any one of characteristic values of a signal to be measured, and the display unit displays the characteristic value measured by the first characteristic value measurement unit while the characteristic value is associated with time. The second characteristic value measurement unit measures any one of the characteristic values of the signal to be measured, and the display form changing unit changes a display form on the display unit according to the characteristic value measured by the second characteristic value measurement unit.

Abstract: A radiation monitor includes an ionization chamber for detecting radiation that passes into the ionization chamber. The ionization chamber generates a current flow in response to the detected radiation. An electrometer is electrically connected to the ionization chamber for measuring the current flow generated by the ionization chamber. The electrometer is operable in a plurality of modes based on a magnitude of the current flow generated by the ionization chamber. A method of measuring current flow through an electrometer of a radiation monitor is also provided.

Abstract: A method for detecting passive intermodulation (PIM) using a PIM analyzing device is provided. The PIM analyzing device transmits two signals comprising first and second signals over a signal transmission medium. The PIM analyzing device receives reflected signals associated with the transmitted signals. The PIM analyzing device determines whether the frequencies of the received signals correspond to the calculated PIM signal frequencies.

Abstract: A Flash-based memory system comprises a plurality of Flash memory devices, a Flash controller communicating independently with each Flash memory device to perform memory operations, a power circuit providing power the Flash memory devices, and a CPU configured to perform a controlled powering down procedure upon detecting a power failure. In some embodiments, the Flash-based memory system includes a backup power source having a charge storage device and charging circuitry, the CPU configured to perform one or more test procedures on the charge storage device to provide an indication of a charge storage capacity of the charge storage device. A plurality of Flash-based memory systems may be mounted on a Flash-based memory card, and multiple such Flash-based memory cards may be combined into a Flash-based memory module. A number of Flash-based memory modules may then be removably mounted in a rack-mountable housing to form unitary Flash-based memory unit.

Abstract: A method, apparatus and a computer program product are described for providing visual presentation of driving related information, by detecting one or more driving events carried out by a driver of a moving vehicle; determining performance severity of the one or more driving events; classifying the one or more driving events according to pre-defined categories based on the respective performance severity of the one or more driving events; providing a visual presentation which comprises one or more concentric rings, and wherein the number of the concentric rings provides an indication that relates to recent driving performance of the driver.

Abstract: A relay for automatically selecting a monitoring range for monitoring a parameter of an input source and a method for monitoring a parameter of an input source can be provided whereby the relay comprises one or more terminals for coupling to the input source; a plurality of switchable circuits coupled to the one or more terminals; a processing module coupled to the plurality of switchable circuits for automatically selecting a monitoring range from a plurality of monitoring ranges based on a value of the parameter of the input source, each monitoring range associated with one or more of said switchable circuits; and a relay switch being configured to provide or disrupt electrical communication to a circuit, based on a trigger signal provided by the processing module. A signal conditioning module may also be provided for e.g. conditioning signals prior to selection of the monitoring range.

Abstract: A measuring device including a control device, at least two ports, at least two measurement channels and at least two display devices. The control device assigns ports to the measurement channels and connects the measurement channels to these ports internally, at least logically. In this context, one display device is assigned to every port. The display devices allocated to the ports display information, which relates to the present assignment and/or utilization of the respective ports.

Abstract: A switch detection system (100) includes a first switch (102) having a pole node (153), a normally closed contact (160), and a normally open contact (161), the pole node (153) of the first switch (102) connected to a voltage source node (104), a second switch (102) having a pole node (153), a normally closed contact (160) and a normally open contact (161), the pole node (153) of the second switch (102) connected to the normally closed contact (160) of the first switch (102), a voltage detector (106) connected to the normally closed contact (160) of the second switch (102), a first resistor (108) connected to the normally open contact (161) of the first switch (102), and a second resistor (108) connected to the normally open contact (161) of the first switch (102) and the normally open contact (161) of the second switch (102).

Abstract: A system for measuring phase attributes of high voltage electrical lines comprises first and second high voltage probes. Each of the probes comprises a sensing element for selectively measuring voltage of a high voltage electrical line, a processing device for detecting zero crossings of the measured voltage and applying a time tag to the zero crossings, and storing samples of the amplitude and time tagged zero crossings. A transceiver transmits storage samples. A user interface device is remote from the first and second high voltage probes and comprises a transceiver for receiving transmitted storage samples. A memory stores received samples of the time tagged zero crossings for the first and second high voltage electrical lines. A processor is operatively associated with the memory for determining phase relationships between the first and second high voltage electrical lines. A display displays the phase relationships.

Abstract: Clamp meter with detachable clamp and a clamp storage area. The clamp meter includes a clamp and a housing. The clamp includes a measurement end and a handle portion. The measurement end includes a first measurement portion and a second measurement portion. The handle portion includes a first handle and a second handle. The housing includes a recess configured to removably receive the clamp when the clamp is not in use. The housing is connected to the clamp via a cord. When the clamp is received in the recess, the first measurement portion and the second measurement portion are positioned completely within the recess, the first handle and the second handle extend at least partially from the recess, and the recess prevents the clamp from being used. The clamp is capable of being removed from the recess in a one-handed use position.

Abstract: A physically rotatable display for a test and measurement apparatus is provided. The display of instrument information and data is automatically reconfigured based on the user selected orientation to provide optimal data display.

Abstract: A multimeter includes: a rotary switch which selects a measurement function; a common terminal hole into which a connector of a test probe is inserted; selection terminal holes into which the connector of the test probe is selectively inserted; and shutter plates which selectively open the selection terminal holes. The rotary switch includes convex portions. The shutter plate includes a hole corresponding to the common terminal hole so that the shutter plate rotates by using the center of the common terminal hole as the rotation axis and includes a concave portion engageable with the convex portion so that the shutter plate rotates to open the selection terminal holes by the movement of the convex portion. The shutter plate includes a concave portion engageable with the convex portion so that the shutter plate opens and closes the selection terminal hole by the movement of the convex portion.

Abstract: The disclosed technology relates to a probe for use with a test and measurement instrument. The probe includes a digital multimeter or voltmeter with an analog-to-digital converter configured to measure a signal from a device under test and determine a digital measurement from the signal, a controller connected to the multimeter or voltmeter configured to receive the digital measurement from the multimeter or voltmeter, a digital communication interface connected to the controller configured to communicate with the controller, and a communication link connected to the digital communication interface and the analog signal interface to communicate with the test and measurement instrument.

Abstract: A metering device includes a first transformer that receives an analog waveform and generates a first stepped-down output signal; a second transformer that receives the analog waveform and generates a second stepped-down output signal; first biasing circuitry that receives the first output signal from the first transformer and generates a first digital signal within a first range, wherein the first biasing circuitry includes a switching device for switching between a first and second operational sub-range; second biasing circuitry that receives the second output signal from the second transformer and generates a second digital signal within a second range; and a processor assembly in communication with the first biasing circuitry, wherein if the first digital signal saturates the first operational sub-range, the processor assembly controls the switching device to process the first output signal in the second operational sub-range.

Abstract: A method of operating a device connected to an electric power line conductor includes the steps of attaching a device to a first electric power line conductor, sensing a current in the first electric power line conductor and selecting between a first set of windings and a second set of windings connected in series with the first electric power line conductor.

Abstract: 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.

Abstract: A system for measuring soft starter current includes a current monitoring system including a controller and a current transfer device that includes a first thyristor and a first conductor coupled to the first thyristor and configured to convey a first current flowing through the first thyristor, wherein the first current includes current flowing through the first thyristor when the first thyristor is in an off state. The system also includes a first current sensor configured to sense the first current and a first current measurement circuit coupled to the first current sensor and coupleable to the controller and configured to output a first output value to the controller representative of the first current flowing through the first thyristor. The controller is configured to determine an impending inoperability of the first thyristor based on the first current and alert a user if the first current indicates the impending inoperability.

Abstract: A method for determining electrical characteristics at a point of regulation to which plural energy providing/production units are connected via a common node is provided. The electrical characteristics at an output terminal of each of the plural energy providing/production units are measured in order to obtain plural measured electrical characteristics. Circuit configuration information about a configuration of a circuitry connected between the plural energy providing/production units and the point of regulation is obtained. Electrical characteristics at the point of regulation are calculated based on the plural measured electrical characteristics and the circuit configuration information.

Abstract: A system and method for testing capacitance of a load circuit connected to an output pin of a driving circuit In one embodiment, the method may comprise driving a voltage at the output pin to a first voltage; a predetermined current to the output pin; comparing the voltage at the output pin to a reference voltage; and when the voltage at the output pin matches the reference voltage, generating an estimate of capacitance present at the output pin based on a number of clock cycles occurring between an onset of a timed voltage change period and a time at which the voltage at the output pin matches the reference voltage.

Abstract: A digital multimeter includes a single chip processor, a sound chip connected to the single chip processor, a signal amplifying circuit, a speaker connected to the signal amplifying circuit, and a power source for providing electrical energy for the digital multimeter. The single chip processor collects high and low level signals, and converts the signals into codes which the sound chip can recognize, and transmits the codes to the sound chip. The sound chip converts the codes into audio signals and transmits the audio signals to the signal amplifying circuit. The signal amplifying circuit amplifies the audio signals and outputs the amplified audio signals to the speaker. The amplified audio signals reports the measurement values of the digital multimeter.

Abstract: An AC voltage detection circuit includes a conversion module, a comparison module, and a prompt module. The conversion module connects to an AC power source and converts the AC voltage provided by the AC power source to an AC current, and then converts the AC current to a direct current (DC) voltage reflecting the AC voltage. The comparison module is connected to the conversion module, and compares the DC voltage with a first predetermined voltage and a second lesser predetermined voltage, and produces a control signal when the DC voltage is greater than the first predetermined voltage or less than the second predetermined voltage. The prompt module produces a prompt signal when receiving the control signal.

Abstract: The measuring machine according to the invention has a display device, a processing device, and at least one measurement channel. The processing device measures the measurement signal of the at least one measurement channel. The display device displays the measurement signal of the at least one measurement channel as a chart. A plurality of charts can thereby be displayed at once. The display device additionally displays preview charts. The preview diagrams are scaled representations of the diagrams. The plurality of diagrams can be displayed cascaded and/or horizontally tiled and/or vertically tiled. The multiple plots can be displayed at different, preferably arbitrary positions of the display device.

Abstract: A multimeter includes: a rotary switch which selects a measurement function; a common terminal hole into which a connector of a test probe is inserted; selection terminal holes into which the connector of the test probe is selectively inserted; and shutter plates which selectively open the selection terminal holes. The rotary switch includes convex portions. The shutter plate includes a hole corresponding to the common terminal hole so that the shutter plate rotates by using the center of the common terminal hole as the rotation axis and includes a concave portion engageable with the convex portion so that the shutter plate rotates to open the selection terminal holes by the movement of the convex portion. The shutter plate includes a concave portion engageable with the convex portion so that the shutter plate opens and closes the selection terminal hole by the movement of the convex portion.

Abstract: A meter apparatus having three-phase judgment function includes a control unit, a multimeter measurement unit electrically connected to the control unit, a three-phase judgment unit electrically connected to the control unit, a first measurement jack electrically connected to the multimeter measurement unit and the three-phase judgment unit, a second measurement jack electrically connected to the multimeter measurement unit and the three-phase judgment unit, and a third measurement jack electrically connected to the multimeter measurement unit and the three-phase judgment unit.

Abstract: A multi-meter for a test probe includes a main body, two test probes and a clamping means. The test probe includes a test pin, a connecting portion, and a lead electrically connected between the test pin and the connecting portion. The connecting portion is inserted into the main body and electrically thereto. The clamping means comprises a liftable cover and a clamping portion formed on the liftable cover. One end of the liftable cover is pivotally connected to the main body. The clamping portion is configured to clamp the test pin. By this structure, the test pin is clamped by the camping portion to help a user carrying out the measurement.

Abstract: An electricity meter comprises a single current sensor with a toroidal coil that has an inner bore extending substantially through the sensor. The meter also has two current conductors that form one of a pair of line-side blades of the meter. The electricity meter also has a disconnect switch with a pair of moveable contacts and a pair of fixed contacts. One of the pairs contacts is electrically connected to the current conductors. The other pair forms a respective load-side blade of the meter. One current conductor passes through the inner bore of the current sensor in a first direction relative to its line-side blade and the other current conductor passes through the inner bore of the current sensor in a substantially opposite direction relative to its line-side blade so that current passing through the conductors passes through the inner bore of the current sensor in a same direction.

Abstract: A method for testing electronic devices that are correspondingly connected to test units includes generating control signals for the electronic devices that are connected to one or more test units selected from the test units. A control unit adds ID codes corresponding to the selected test units to the control signals, and wirelessly transmits the control signals with the ID codes to all of the test units. Each of the test units compares the ID codes added to the control signals with its own stored ID code. When the ID code added to a control signal is in accordance with the ID code stored in one of the test units, the test unit controls the electronic device connected thereto to be turned on and off according to the control signal.

Abstract: 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.

Abstract: A multimeter with filtered measurement mode is disclosed. The multimeter includes a signal conditioning circuit, a low-pass filter, a microprocessor, a measurement circuit, a root-mean-square (RMS) converter, a display unit, and an external rotary switch. The signal conditioning circuit receives a control signal to select an operation mode of the multimeter. The low-pass filter is electrically connected to the signal conditioning circuit. The microprocessor is electrically connected to the signal conditioning circuit. The measurement circuit is electrically connected to the microprocessor and the RMS converter to measure a signal outputted from the RMS converter. The display unit is electrically connected to the microprocessor and the measurement circuit. Also, the external rotary switch is optionally connected to the microprocessor. Whereby rotating the external rotary switch to generate the control signal and perform a low-pass filtering mode to communicate the low-pass filter with the RMS converter.

Abstract: A method and apparatus measures electrical power usage and quality, while mitigating the effects of noise on measured signals or parameters. Specifically, a digital electrical power and energy meter employs a method in which a processor averages a parameter, such as voltage or current, over a plurality of cycles of a time-varying signal, such as an AC electrical signal. The method employed by the meter samples a parameter over the plurality of cycles and computes the average of the samples corresponding to the same phase angle of the signal to produce an average signal.

Abstract: A digital multimeter provides information regarding measurements shown on a display of the multimeter, and available functions of the multimeter. The information typically relates to a current context of the multimeter. The context may include a current mode or other setting of the multimeter.

Abstract: A digital multimeter automatically records measurements of electrical or physical parameters. The multimeter may record the measurements based on events such as the passage of time, fluctuations or deviations in the measurements, or user inputs. In some examples, the digital multimeter operates at a reduced power setting during automatic recording operations.

Abstract: A digital voltage detector system that is compatible with existing Armament Circuits Preload Test Sets is described. Adjustment of under and over voltage trip points is accommodated in accordance with conventional means. The digital voltage detector is compatible with all conventional Voltage Detector interface cables and adapters. Unlike the conventional voltage detector of existing Armament Circuits Preload Test Sets, over-voltage trips do not blow a fuse, eliminating the need to have replacement fuses or redundant conventional voltage detectors in an Armament Circuits Preload Test Set. Additionally, the digital voltage detector provides a digital voltage readout allowing the user to view the input voltage during a Presence of Voltage test. The digital voltage detector system facilitates timely and efficient execution of the Armament Circuits Preload Test series.

Abstract: A multimeter having measurement terminals and configured to receive measurement signals applied to the measurement terminals and a measurement value and also configured to receive communication signals applied to the measurement terminals and extract encoded information from the communication signals. The multimeter can be included in a multimeter communication system having a device coupled to the measurement terminals of the multimeter. The device is configured to generate communication signals having encoded information and provide the communication signals to the measurement terminals of the multimeter.

Abstract: A multimeter includes a main body, two probes extending from the main body, a battery unit arranged in the main body, and a charging system arranged in the main body and configured for charging the battery. The charging system includes a microcontroller with an external input voltage sampling circuit, a battery voltage sampling circuit and a voltage regulator circuit each electrically connected the microcontroller. The microcontroller compares sampled signals from the external input voltage sampling circuit and the battery voltage sampling circuit, and controls the voltage regulator circuit to regulate the external input voltage to be applicable to the battery based on the comparison.

Abstract: Disclosed herein is an AC line signal detection device including: a semiconductor integrated circuit; and a conversion section adapted to rectify an AC line signal and convert the rectified signal to an input signal to be fed to the semiconductor integrated circuit, wherein the semiconductor integrated circuit includes a monitoring section adapted to divide the AC line signal into a plurality of voltage ranges with at least one reference voltage proportional to the amplitude of the AC line signal to monitor within which voltage range the AC line signal falls; a measuring section adapted to measure a duration for which the AC line signal remains in each of the voltage ranges; and a determination section adapted to determine, based on the monitoring result of the monitoring section and the measurement result of the measuring section, whether the duration for which the AC line signal remains in each of the voltage ranges exceeds a set time which can be set in advance to make a pass/fail determination on the AC l

Abstract: A method and apparatus provides improved resolution in an analog signal, relative to the resolution of a digital-to-analog converter producing the signal. In one embodiment, a digital electrical power and energy meter varies a digital input to a digital-to-analog converter such that an average of the output of the digital-to-analog converter indicates a value with greater resolution than the instantaneous resolution of the digital-to-analog converter.

Abstract: A multi-meter for a test probe includes a main body, two test probes and a clamping means. The test probe includes a test pin, a connecting portion, and a lead electrically connected between the test pin and the connecting portion. The connecting portion is inserted into the main body and electrically thereto. The clamping means comprises a liftable cover and a clamping portion formed on the liftable cover. One end of the liftable cover is pivotally connected to the main body. The clamping portion is configured to clamp the test pin. By this structure, the test pin is clamped by the camping portion to help a user carrying out the measurement.

Abstract: 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.

Abstract: In one embodiment, a measurement apparatus has an input stage, an output stage and a multiplexer. The input stage has a signal input, a plurality of measurement range outputs, and a plurality of selectable gain stages, with each of the selectable gain stages being coupled between the signal input and a respective one of the measurement range outputs. The output stage has a measurement acquisition path between an analog measurement input and a digital measurement output. The measurement acquisition path includes an analog-to-digital converter. The multiplexer has i) a plurality of data inputs, at least two of which are coupled to respective ones of the plurality of measurement range outputs, and at least one of which is a reference input configured to receive a signal to which signals appearing at the measurement range outputs are commonly referenced, ii) a data output coupled to the analog measurement input of the output stage, and iii) a control input.

Abstract: A device for preventing electrical shorting between positive and negative terminals of a wiring harness includes a clip securable to conductors of the harness, a wall extending from the clip to be positioned between first and second terminals of the conductors when the clip, and a shield attached to the clip and movable between a first position wherein it blocks contact between a tool and the first terminal while allowing contact between the tool and the second terminal, and a second position wherein it blocks contact between the tool and the second terminal while allowing contact between the tool and the first terminal.

Abstract: A clamp-on multimeter measures alternating current flow in an electrical conductor. The multimeter includes a display, a housing including the display, a first sensor, a second sensor, a processor and an integrator. The first sensor has a magnetizable material core and inductively senses the alternating current. The first sensor includes a first clamp portion fixed to the housing and a second clamp portion pivotally coupled to the first clamp portion. The second sensor includes a Rogowski coil that has a non-magnetic core and inductively senses the alternating current. The processor receives an input signal in a first voltage range and sends an output signal to the digital display. The integrator scales a signal from the second sensor in a second voltage range to the first voltage range. The housing includes the processor, the integrator, and a selector configured to select the input signal to the processor from one of the first sensor and the integrator.

Abstract: A digital multimeter includes a single chip processor, a sound chip connected to the single chip processor, a signal amplifying circuit, a speaker connected to the signal amplifying circuit, and a power source for providing electrical energy for the digital multimeter. The single chip processor collects high and low level signals, and converts the signals into codes which the sound chip can recognize, and transmits the codes to the sound chip. The sound chip converts the codes into audio signals and transmits the audio signals to the signal amplifying circuit. The signal amplifying circuit amplifies the audio signals and outputs the amplified audio signals to the speaker. The amplified audio signals reports the measurement values of the digital multimeter.

Abstract: A three-phase selection energy meter is disclosed. In one embodiment, an energy meter includes a base; a phase A terminal barrel, a phase B terminal barrel and a phase C terminal barrel; and a phase selection member movably engaged with the base, the phase selection member permitting individual selection of each of the phase A terminal barrel, the phase B terminal barrel and the phase C terminal barrel, wherein the individual selection of the one of the phase A terminal barrel, the phase B terminal barrel or the phase C terminal barrel prohibits selection of the other two of the phase A terminal barrel, the phase B terminal barrel and the phase C terminal barrel.

Abstract: A digital multimeter includes an auto-save component configured to automatically capture and save a sequence of measurements. The auto-save component detects when a measurement becomes stable and upon determining that the measurement has become stable, captures and saves the measurement in a memory of the digital multimeter. The multimeter may additionally include an auto-naming component for automatically assigning a name to each measurement in the sequence, and an auto-hold component for temporarily freezing the display of the stable measurements in the multimeter.

Abstract: A digital voltage detector system that is compatible with existing Armament Circuits Preload Test Sets is described. Adjustment of under and over voltage trip points is accommodated in accordance with conventional means. The digital voltage detector is compatible with all conventional Voltage Detector interface cables and adapters. Unlike the conventional voltage detector of existing Armament Circuits Preload Test Sets, over-voltage trips do not blow a fuse, eliminating the need to have replacement fuses or redundant conventional voltage detectors in an Armament Circuits Preload Test Set. Additionally, the digital voltage detector provides a digital voltage readout allowing the user to view the input voltage during a Presence of Voltage test. The digital voltage detector system facilitates timely and efficient execution of the Armament Circuits Preload Test series.