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7545691 Measuring circuit for qualifying a memory located on a semiconductor device  
A measuring circuit is provided for a memory integrated within a semiconductor device. The measuring circuit includes initializing means and an oscillating loop. The initializing means loadings two...
7072781 Architecture for generating adaptive arbitrary waveforms  
A test system having a feedback loop that facilitates adjusting an output test waveform to a DUT/CUT (Device Under Test/Circuit Under Test) on-the-fly according to changing DUT/CUT parameters. The...
6687631 Laplace transform impedance spectrometer and its measurement method  
A method of measuring impedance is based on carrier function Laplace transform. The measurement includes detecting a response signal from a device under test, to which signal an excitation such as...
6507196 Battery having discharge state indication  
A storage battery of the conventional kind for supplying power to electrical devices has a supervising unit for determining the electric capacity. The supervising unit is electrically connected to...
6411098 Energy device analysis and evaluation  
A method and apparatus for creating, measuring and analyzing polarization voltages developed across an element, such as an electronic component or an electrochemical energy cell, or network of such...
6278280 Battery inactivation detection device  
A cell which has become inactive is detected in a multi-cell battery (15) comprising plural cells (C n ). An inactivity detecting circuit comprising a signal generator (D n 1) and a diode (D n 2)...
6222370 Universal battery monitor  
The invention includes a direct current energy source monitor which automatically detects the nominal voltage of the direct current energy source to which it is attached. The invention further...
6103408 Electric battery  
In an electric battery, an electronic clock is integrated in the battery container in order to monitor battery functions. The frequency of the electronic clock is varied as a function of at least...
5773978 Battery impedance monitor  
A battery impedance monitor includes a driver section having an oscillator which produces a pulsating loading signal which controls periodic loading of the battery to produce at its output...
5717336 Method and apparatus for determining the charge condition of an electrochemical cell  
A method for determining whether an electrochemical cell is substantially fully charged. The determination is made by ascertaining the rate of change of the impedance of the cell with changing...
5592095 Charge measurement circuit for a battery in which oscillators are used to indicate mode of operation  
A battery pack (10) has a charge measurement circuit (12) for estimating the state of charge during use. The charge measurement circuit (12) includes a sense resistor (24), amplifier (26), at least...
5477129 Charge level display method and apparatus for a battery of an electronic device  
A portable computer is positionable between an open condition in which an input device and an output device thereof is exposed to a user of the portable computer, and a closed condition in which...
5369364 Battery state of charge determination with plural periodic measurements to determine its internal impedance and geometric capacitance  
A method and apparatus for measuring the depletion level (depth of discharge) of a lithium-iodine battery in an implantable medical device. A first set of measurements are made to determine the...
5250903 Method and apparatus using oscillatory magnetic field to determine state of charge of an electrolytic storage cell  
Nonintrusive sensors capable of measuring various storage cell parameters such as voltage, state-of-charge, electrolyte level, internal resistance, and temperature are attached to a monitoring...
5238184 Thermostat having simple battery level detection  
A thermostat having a simple battery level detection circuit. The output of an oscillator, having a frequency dependent upon the battery level, is compared to the output of a battery level...
5187441 Portable information apparatus for sensing battery voltage drop  
The portable information apparatus has a battery, a boosting circuit for boosting a voltage of the battery, a battery voltage detector for detecting a voltage level of the battery, an oscillating...
5140269 Electronic tester for assessing battery/cell capacity  
A self-contained electronic device instantaneously assesses the stored energy capacity of single, two-volt, lead-acid cells; or of batteries comprised of such cells. The testing device is...
5093624 Battery monitoring  
Monitoring state of charge of an electric storage battery (18) is done by deliberately inducing eddy currents, specifically using an induction coil (70) in conductive metallic constituents of...
5047722 Apparatus for measuring internal resistance of wet cell storage batteries having non-removable cell caps  
Apparatus for measuring the total internal resistance of a multicell battery having positive and negative terminals employs a first transistor device having an input and an output and having...
4981764 Method of providing a indication signal to indicate a level of electrolyte in a wet cell  
A battery monitors by which an individual cell in a wet cell battery may be monitored for variations in the level of electrolyte contained in the cell. More specifically, the invention relates to a...
4875940 Massecuite supersaturation monitor  
The invention provides an apparatus for controlling both the supersaturation of the mother liquor and the crystal content of massecuite by measuring di-electric constant and electrical conductivity...
4825170 Electronic battery testing device with automatic voltage scaling  
A self-contained electronic device for testing disparate storage batteries having any one of a fixed plurality of possible nominal voltages is disclosed. The testing device performs small-signal...
4719428 Storage battery condition tester utilizing low load current  
A condition tester for a storage battery that monitors the effect of internal battery resistance without drawing large currents. A switched load periodically draws a small current across the...
4693119 Lithium battery energy monitor  
A lithium battery is provided with an energy monitor that continuously inates the energy remaining in the battery. An electrolytic coulometer is connected in series with the battery and has a...
4687996 Method and apparatus for measuring remaining charge of galvanic cell  
A method and apparatus for measuring the remaining charge of a galvanic cell effects the measurement of the remaining charge by superimposing an AC voltage or current on DC voltage or current...
4560937 Battery state of charge metering method and apparatus  
The system includes a digital integrator having a plurality of digital stages operable to store a numerical value in binary digital form which is indicative of state of charge. A switching circuit...
4535325 Low charge detector  
A low charge detector, for a measuring instrument incorporating a meter for indicating measurement readings, includes a "low battery detector" circuit which causes a first output to be released...
4517517 Nickel-cadmium battery conditioner and tester apparatus  
A battery tester apparatus having a discharge circuit with a visual indicator that the discharge cycle is in progress operating in combination with a comparator to determine when the terminal...
4498044 Method and circuitry for measuring the impedance of a sensor  
A method of measuring the impedance of a sensor by applying a sine-shaped AC voltage and transforming the response signal proportional to said impedance into a DC voltage such that even for very...
4488115 Low battery voltage indicator circuit for a metal detector  
A metal detector is disclosed which has a transmit coil, a receive coil, and circuit means for detecting metal objects due to a change in the magnetic coupling between the coils. Circuit board...
4376265 Power source voltage checking device particularly for checking the voltage of a battery in a camera  
In the disclosed device, a signal forming circuit produces a signal having a frequency corresponding to the voltage of a power source. A level detector detects the level of the voltage of the power...
4360779 Measuring device for electrical cells  
The present invention relates to apparatus and methods for measuring the different potential drops in electrochemical cells (EC), i.e. measuring independently the following: anodic and cathodic...
4338596 Circuit for indicating the condition of the battery in a photographic camera  
When the battery voltage is sufficient, and not nearing the point of insufficiency, a light-emitting diode is steadily illuminated. As the battery voltage decreases, the steady component of...
4284951 Battery electrolyte level sensor  
Apparatus for indicating the level of the electrolyte in a battery cell. A three-electrode sensor probe having the electrodes partially embedded in an electrically insulating housing suspended in...
4253064 Liquid level sensing system  
A system for determining the presence or absence of coolant liquid as well as for monitoring the effectiveness of corrosion inhibition of the liquid includes a high impedance differential amplifier...
4163193 Battery voltage detecting apparatus for an electronic timepiece  
A battery voltage detecting circuit for detecting a low battery voltage condition. A memory stores a reference digital voltage signal defining a digital value of a reference voltage level of a...
4153867 Device for determining the charge condition for a secondary electric storage battery  
A device for determining the charge condition of a secondary electric storage battery, and including a digital integrator comprising a pulse generator for producing pulses at a frequency...
4053824 Method and device for checking a storage battery  
A battery of series-connected storage cells is checked by: Measuring the transient elementary open-circuit voltage at the terminals of each storage cell; Comparing the said elementary...
3992662 Liquid conductivity measuring device  
A portable device for measuring the conductivity of a liquid between two probes spaced relative to each other along the lateral axis of a container. The gains of a plurality of operational...
3927366 Method for determining the end of life of a pulse generator power source  
A regulator for a pulse generator which acts to decrease the output of the pulse generator in a linear fashion such that each pulse has an amplitude which is lower by a generally constant known...
3924175 D.C. system for conductivity measurements  
A d.c. system for measurement of conductivity of an electrolyte. Four side-by-side metallic electrodes serve as auxiliary electrodes for passing current through the electrolyte and reference...
3906353 Oscillator circuit for providing a conductivity ratio of sea water  
An oscillator circuit wherein two conductivity cells are arranged in a circuit to provide a conductivity ratio which is converted into a linear variation of the period or frequency of the oscillator.
3832629 BATTERY CONDITION INDICATOR  
A Battery Voltage Indicator is provided for indicating the condition of the battery or dry cells or the like by providing light flashes or a steady light from a light emitting diode when the...
3808487 METHOD OF CHARGING A STORAGE BATTERY AND OF DETECTING THE TERMINATION OF CHARGING  
A method of charging a storage battery and of detecting the termination of charging, including detecting by suitable means, the variations of at least one of the parameters of the modified charging...
3778702 OPERATING TIME REMAINING COMPUTER  
A computer for determining the time remaining at the present rate of energy dissipation before a finite energy source is completely drained of energy. The rate of energy consumption is sensed and...
3753094 OHMMETER FOR MEASURING THE INTERNAL RESISTANCE OF A BATTERY AND DIRECTLY READING THE MEASURED RESISTANCE VALUE  
An ohmmeter for measuring the internal resistance of a battery by an A.C. method. The output of a DC power circuit is converted into an alternating current of prescribed frequency through a DC - AC...
3714555 CONDUCTIVITY SENSOR  
A conductivity cell has a pair of similar conductivity measuring sub-assemblies extending in opposite directions from an annular energizing electrode. Each sub-assembly includes a pair of...
3701006 METHODS AND APPARATUS FOR MEASURING THE ELECTRICAL RESISTIVITY OF FLOWING DRILLING MUDS  
As a representative embodiment of the invention disclosed herein, one or more electrical measuring devices are placed at selected locations in the drilling mud circulating system of a conventional...
3676770 PULSE SAMPLING BATTERY FUEL GAUGING AND RESISTANCE METERING METHOD AND MEANS  
A continuously operating low dissipation system for sensing the electrical resistance of an element while the element carries a normal operating current. A pulse of electrical energy having a...
3550105 BATTERY CONDITION INDICATOR  
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