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| Number | Title | Issue Date |
| 7960965 | Multimeter having communications via measurement terminals and communication system for same 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 informa... | 06/14/2011 |
| 7468602 | Digital multi-meter 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 softwar... | 12/23/2008 |
| 7439725 | Multimeter A multimeter has a housing with at least three input connections, configured as female connectors, for connecting to two measurement lines. When a measurement variable is changed, it is possible to connect at least one of the measurement lines to another input conne... | 10/21/2008 |
| 7365528 | Method and apparatus of voltage measurement using flying capacitor and switching circuits The present invention is to provide a method and apparatus of voltage measurement with a high resolution. An apparatus of voltage measurement includes: a buffer circuit for separating a voltage between terminals of a capacitor or an equivalent voltage into a first v... | 04/29/2008 |
| 7352166 | Resistance ratio digitizing ohmmeter system A digitizing ohmmeter system for providing a digital resistance ratio measurement includes a high impedance current source providing a DC excitation current to an impedance-varying input sensor and a reference resistor and an ADC circuit including a charge-balancing... | 04/01/2008 |
| 7342393 | Multimeter with filtered measurement mode 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 w... | 03/11/2008 |
| 7336063 | Voltage detector A voltage detector that more accurately measures AC voltage of a voltage conductor by correcting the voltage detected directly by the detector's contact probe to account for the conductor's size and shape. The housing of the detector has plural non-contact electrode... | 02/26/2008 |
| 7304467 | Circuit for simultaneous testing of electricity meters with interconnected current and voltage circuits Circuit arrangement for simultaneous testing of electricity meters with interconnected current and voltage circuits comprising plurality of said meters having all voltage terminals associated with the same phase connected parallel to respective voltage source and ea... | 12/04/2007 |
| 7271578 | Voltage monitoring circuit A voltage monitoring circuit is capable of being integrated into a chip and monitoring the voltage quality. It mainly uses a first waveshaper to receive a voltage signal of a voltage source to be measured, process it to a logic signal, and output to a first logic le... | 09/18/2007 |
| 7250777 | Method and device for measuring resistance A device for measuring a resistance includes a comparator. A D-type flip-flop has its D input connected to the output of the comparator and its latch input connected for receiving a pulse signal at a fixed pulse repetition rate. A reference voltage source is connect... | 07/31/2007 |
| 7184899 | Energizable electrical test device for measuring current and resistance of an electrical circuit Provided is an electrical test device having multi-meter functionality and being adapted to provide current sourcing to an electrical system for selective measurement of a plurality of parameters. The electrical test device comprises a conductor probe element, a pow... | 02/27/2007 |
| 7157956 | Switched capacitor input circuit and method therefor A switched capacitor input circuit (200) includes an input buffer (210), a switched capacitor sampler circuit (220), and an integrator (250). The input buffer (210) has an input terminal for receiving an input voltage, and an outpu... | 01/02/2007 |
| 7157955 | Switched capacitor sampler circuit and method therefor A switched capacitor sampler circuit (220) includes an input terminal (224) for receiving an input voltage, an output terminal (226), a capacitor (222) having first and second terminals, and a switching circuit (230). The switching... | 01/02/2007 |
| 7149263 | AGC method and circuit for digital radio receiver A gain of an amplifier of a receiver is automatically controlled based on a level of a signal received by the receiver. The instantaneous value of the envelope of the received signal is detected sequentially at predetermined time intervals. The first interval averag... | 12/12/2006 |
| 7075475 | Correlated double sampling modulation system with reduced latency of reference to input A charge balancing modulation system for digitizing the output of a variable impedance sensor utilizes synchronous excitation of the input sensor and AC coupling of the analog input signal. In one embodiment, the modulation system includes a switched excitation sour... | 07/11/2006 |
| 7049989 | Unified analog input front end apparatus and method An analog input front end includes a configurable gain stage and an analog-to-digital converter. The configurable gain stage receives an analog input signal, such as a differential analog input signal, and provides a gain value to the analog input signal so as to ou... | 05/23/2006 |
| 7034517 | Multimeter with filtered measurement mode 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 w... | 04/25/2006 |
| 6992489 | Multiple voltage level detection circuit A circuit configurable for indicating a voltage level of an input signal applied to the circuit includes at least one transistor having a first terminal connected to a first voltage supply, a second terminal configured for receiving the input signal, and a third ter... | 01/31/2006 |
| 6975103 | Resistance ratio digitizing ohmmeter system A digitizing ohmmeter system for providing a digital resistance ratio measurement includes a high impedance current source providing a DC excitation current to an impedance-varying input sensor and a reference resistor and an ADC circuit including a charge-balancing... | 12/13/2005 |
| 6975104 | Clamp meter with dual display 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 e... | 12/13/2005 |
| 6936978 | Methods and apparatus for remotely controlled illumination of liquids Methods and apparatus for remotely controlled illumination of liquids in a variety of environments. In one example, remotely controlled multi-color LED-based light sources are employed to achieve a wide range of enhanced lighting effects in liquids. In another examp... | 08/30/2005 |
| 6927564 | Multimeter instrument with touch-sensitive selection device A multimeter instrument for measuring variables, such as electrical current, voltage, or resistance includes touch-sensitive zones for selection of the variable to be measured. The measurement circuit associated with the variable selected with the aid of touch-sensi... | 08/09/2005 |
| 6927590 | Method and circuit for testing a regulated power supply in an integrated circuit A voltage regulated power supply test circuit including: a voltage regulator electrically connected to at least one regulated voltage node of a functional circuit of an integrated circuit chip; and means for selectively connecting between one of the at least one reg... | 08/09/2005 |
| 6870358 | Methods and apparatuses for peak detection among multiple signals Digital peak detection among multiple signals, or inputs. In one embodiment, a detection method that includes receiving multiple digitized input signals. For each digitized input signal, the method also includes noting a first data value associated with the digitize... | 03/22/2005 |
| 6794859 | Automatic multimeter To measure a resistance value in a circuit by conventional method, one side of the resistor should be disconnected from the circuit, then an Ohmmeter is connected across the resistor. To measure a current through a component, one side of the component should be disc... | 09/21/2004 |
| 6731102 | Electronic test instrument with extended functions An electronic test instrument in the form of a clamp meter has a non-contact voltage sensing circuit which includes a blade and sensor built into the clamp. The test instrument also has a shaker circuit that produces a tactile vibration in the presence of an AC volt... | 05/04/2004 |
| 6646430 | Current measuring shunt with circuitry mounted thereon A current sensor which has a rigid metallic link member having two end portions of conductive material and an intermediate portion of resistive material interconnecting the end portions. An integrated circuit analog to digital converter is mounted on the ... | 11/11/2003 |
| 6556003 | Computer multimeter With added circuits and the computer's existing internal circuits and devices, a PC can function as a multimeter for those users who are testing, designing or analyzing an electronic device, which requires the features of a computer and a multimeter. This... | 04/29/2003 |
| 6507183 | Method and a device for measuring an analog voltage in a non-volatile memory Presented is an analog voltage value measuring device for measuring any of a set of voltage references that are generated inside a memory architecture. The selected voltage to be measured is connected to a facility line through a multiplexer. The memory a... | 01/14/2003 |
| 6466003 | Microamp measurement for two-terminal digital meter A two-terminal multimeter capable of both volt/ohm and current measurement employs an input protection circuit with a positive temperature coefficient impedance and a reference impedance, across which an A-D converter takes measurements. A current measure... | 10/15/2002 |
| 6429641 | Power booster and current measuring unit A power booster and current measuring circuit provides a quiet, accurate voltage to a load (such as a transistor during parametric testing) with a load current of up to 1 ampere, and can measure that load current to an accuracy of &#b1;0.1 % over a range ... | 08/06/2002 |
| 6380726 | Smart auto-ranging RMS measurement method and apparatus An apparatus and method for performing an auto-ranging function in electronics test equipment monitors both the RMS value and the peak value of the input signal to be measured. In the subject system, a peak signal measurement which exceeds the dynamic ran... | 04/30/2002 |
| 6119073 | Variable color digital measuring instrument for sequentially exhibiting measured values A variable color digital measuring instrument sequentially exhibits measured values in a color in accordance with the relation of the present measured value to a past measured value. A memory, controlled by a timer, is provided for storing data representi... | 09/12/2000 |
| 5920196 | Rapid low voltage testing apparatus A rapid low voltage testing apparatus for detecting sequentially a plurality of electrical components of an electrical circuitry device for at least one of a plurality of predetermined low voltage levels. The rapid low voltage testing apparatus comprises ... | 07/06/1999 |
| 5764048 | Ultra high accuracy voltage measurement system An ultra high accuracy voltage measurement system utilizes a Josephson junction voltage generator whose voltage is controlled by a high precision frequency. The voltage measurement system to measure an input DC voltage incudes: a microwave oscillator whic... | 06/09/1998 |
| 5621311 | Digital multimeter having an improved enclosure A digital multimeter is provided with a highly reliable seal at a connection interface between an upper and lower enclosure forming an enclosure. The multimeter also has a highly reliable seal at peripheral boundaries of operating elements disposed on a s... | 04/15/1997 |
| 5619114 | Signal averager for use with motor controller A method and apparatus used with a motor controller for determining the average value of a voltage signal including at least two analog integrators that integrate the voltage signal during consecutive and alternating integration periods, a selector receiv... | 04/08/1997 |
| 5543707 | Digital tester A digital tester includes structure for: automatically effecting AC/DC determination of an input signal and subsequent AC/DC switch-over of a measurement system, enabling high-response measurement; measuring a pulse width using a simple construction and h... | 08/06/1996 |
| 5455513 | System for measuring properties of materials A system for determining a property, such as conductivity, of a material in which a sensor provides a square wave sensor output signal the value if which is selected to the proper in response to a square wave driver signal. The sensor output signal is com... | 10/03/1995 |
| 5446371 | Precision analog-to-digital converter with low-resolution and high-resolution conversion paths An analog-to-digital converter utilizes low-resolution and high-resolution conversion paths for precision voltage measurements. A first conversion made using a comparatively low resolution ADC is used to predict the reference voltage to one input of a nul... | 08/29/1995 |
