|
Match
|
Document |
Document Title |
|
|
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...
|
|
|
7948227 |
Electrical circuit diagnostic tool
Diagnosing electrical circuit faults can be accomplished with a variety of tools. Voltmeters are frequently used to measure voltage to determine whether a short is present, but are not well-suited...
|
|
|
7746092 |
Intelligent multi-meter with automatic function selection
A measuring device with the function of automatically determining the type of device under test (DUT) and selecting measuring function. The measuring device having a controller for sequentially...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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,...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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;...
|
|
|
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...
|
|
|
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...
|
|
|
RE34899 |
Analog to digital conversion with charge balanced voltage to frequency converter having polarity responsive offset
A bipolar analog voltage is converted into a digital signal by sensing the polarity of the voltage and selectively supplying a bias voltage to an analog-to-digital converter, which can preferably...
|
|
|
5396168 |
Digital multimeter with microprocessor control
A digital multimeter includes a microprocessor control and a keyboard input. The microprocessor functions to control the display of parameters measured by the meter and displays such measured...
|
|
|
5392218 |
Electrically isolated approach to sensing dc voltages referenced to a floating ground
An analog isolation barrier data acquisition system comprises a plurality of satellite sampling modules which are referenced to remote grounds for sensing direct current (dc) voltages which are...
|
|
|
5373237 |
Radio frequency power measurement system
A control system for RF (radio frequency) power measurements eliminates calibration requirements and compensates errors due to nonlinear detector characteristics and temperature drifts by using...
|
|
|
5260647 |
Measuring an AC signal value with sampling when the sampling interval does not exactly divide the AC signal's period
An AC input signal is sampled with a plurality of sets of equally spaced samples, but whose sample interval between the samples does not exactly divide the period of the input signal. Nevertheless,...
|
|
|
5256961 |
Method for measuring various measurable variables, and multimeter for performing the method
A method for measuring various measurable variables with a multimeter includes specifying one of a plurality of measurable variables to be determined through a position of a measurement range...
|
|
|
5250893 |
Digital voltmeter
A voltage measuring instrument which generally includes signal conditioning circuitry coupled to input probes for protection against overvoltages and processing of input voltage signals. A VAC/VDC...
|
|
|
5218290 |
Multi-function, multi-mode switch for an instrument
A multi-function, multi-mode switch for an instrument that changes the instrument between primary and secondary functions and between first and second modes of operation within the primary and...
|
|
|
5153511 |
Test lead socket indicating device for a volt-ohm-milliameter
A test lead socket indicating device is used for a volt-ohm-milliammeter (VOM) having a select input which is operable to set the VOM in a voltage, current or resistance measuring mode, a common...
|
|
|
5153502 |
Low noise charge ramp electrometer
An electrometer capable of measuring small currents without the use of a feedback resistor which tends to contribute a large noise factor to the measured data. The electrometer eliminates the...
|
|
|
5153510 |
High impedance system for measuring voltage
A high voltage measuring system with very high input impedance. The system measures a high voltage source under test by developing a control signal which is proportional to the differential voltage...
|
|
|
5146155 |
Digital measuring circuit for measuring an electrical signal
The present invention relates to a measurement circuit for providing the digital value of an analog electrical signal. The digital measurement circuit for measuring an analog electrical signal...
|
|
|
5101832 |
Method and apparatus for making electrical measurements in the presence of periodic electromagnetic fields
A cardiograph has a remote front end which is connected to a host via a cable. The front end includes a clock and an analog-to-digital converter. The converter periodically holds and samples...
|
|
|
5079509 |
Scale for a measuring instrument
A scale is disclosed for a measuring instrument in which a plurality of display elements, specifically liquid crystal display elements which are energizable to a visible condition or an enhanced...
|
|
|
4987902 |
Apparatus for transmitting patient physiological signals
An apparatus (10) for transmitting a patient physiological signal is provided. A converter (12) includes a front end circuit (28) that receives and conditions a patient physiological signal, VP,...
|
|
|
4959608 |
Apparatus and method for extracting the RMS value from a signal
Disclosed is apparatus and method for converting and displaying the total RMS and AC RMS values of a signal in a voltmeter. This conversion is accomplished in a system having a processor and a...
|
|
|
4949274 |
Test meters
Test meters, particularly of the type employed for testing electrical circuits, e.g. multimeters, are improved in operational efficiency. In one aspect, remote selection of test and/or report...
|
|
|
4935692 |
Vector ammeter having digital signal processing unit
An improved type of vector impedance measuring instrument is disclosed. The vector impedance is a vector current relative to (or normalized to) a pertinent voltage. A transducer for converting the...
|