Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 8164323 | Apparatus for monitoring discharge processes in a conductor of a medium-voltage or high-voltage system An apparatus monitors discharge processes in a conductor of a medium-voltage system or a high-voltage system. The apparatus contains at least one transformer which is suitable for detecting a current flowing in the conductor. The at least one transformer is connecte... | 04/24/2012 |
| 7348854 | Automatic biasing and protection circuit for field effect transistor (FET) devices A transistor biasing circuit is shown that utilizes a negative feedback loop control circuit to set the gate bias voltage in the output transistors of a power amplifier. This control circuit has a current sensor in series with the drain of the transistor, the curren... | 03/25/2008 |
| 7304618 | Remote display for portable meter A remote display is provided for use with a portable meter, such as a portable meter used for obtaining electrical measurements. The remote display can optionally be mounted to an extremity of a user for displaying information obtained by the portable meter within a... | 12/04/2007 |
| 7271579 | AC signal level detection circuit An AC voltage generated by an AC power source 1 is rectified by a full-wave rectifying circuit 2, which generates a rectified voltage. An internal regulator 33 performs waveform shaping of the rectified voltage. A comparator 42 compares t... | 09/18/2007 |
| 7249023 | Navigated menuing for industrial human machine interface via speech recognition An industrial human-machine interface device that permits speech-controlled navigation through a menu using a speech-recognition processor. The speech-recognition processor is coupled to a microcontroller and a display. The microcontroller is interfaced with a power... | 07/24/2007 |
| 7221121 | Frequency converter for different mains voltages The invention is directed to controlling an electric motor by means of a frequency converter. The frequency converter can be connected to one of several different mains voltages. According to the present invention, the maximum output power of the frequency converter... | 05/22/2007 |
| 7177771 | Digital dynamic filtering and beat frequency reduction for power monitoring A power metering apparatus meters a power signal in a powered system. A low-pass filter receives the power signal and outputs a filtered signal. The filter implements a corner frequency programmable based on a first clocking signal and anti-aliases high frequency co... | 02/13/2007 |
| 7071677 | Accurate and efficient sensing method for bi-directional signals An exemplary method and circuit for sensing bi-directional current through a resistive element comprises a sampling unit, a charge transfer unit, and an amplifier. The sampling unit is switchably coupled to the resistive element and samples and stores a voltage corr... | 07/04/2006 |
| 7027991 | Voice-responsive command and control system and methodology for use in a signal measurement system A speech-responsive command and control system and methodology for use in a signal measurement system, enabling an operator to control certain features and functions of the oscilloscope without using manual or graphical controls. A speech-responsive command and cont... | 04/11/2006 |
| 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 |
| 6921897 | Circuit and method for varying the integration time of moving charges from a photodetector An infrared photodetector includes at least two quantum well layers with depths adjusted to provide different peak spectral responses. A readout circuit includes first and second charge wells for receiving moving charges from the photodetector. The readout circuit a... | 07/26/2005 |
| 6714049 | Logic state transition sensor circuit A logic state transition sensor circuit. The logic state transition sensor circuit detects and records transitions in voltage corresponding to a transition of a digital logic state (high to low; low to high). The logic state transition sensor circuit may include a s... | 03/30/2004 |
| 6384591 | Hands-free signal level meter An electrical signal measurement device comprises a system unit which is carried on the person of a technician by attachment to a belt, harness or the like and, in one embodiment, a headpiece incorporating a display, microphone and ear phone. The display,... | 05/07/2002 |
| 6320368 | Method for determining the drive capability of a driver circuit of an integrated circuit A method provides that, when a driver circuit is deactivated, a first capacitor disposed at an output of the driver circuit is placed at a first potential. The driver circuit is then activated at a first point in time, so that a current flows between its ... | 11/20/2001 |
| 6211664 | Device for measuring the rise time of signals interfered with by noise from gamma or X radiation detectors The invention relates to a device for measuring the rise time of the electronic component of a signal disturbed by electronic noise and whose signal-to-noise ratio is mediocre. It incorporates a differentiating circuit (C12, C11) having at least one resis... | 04/03/2001 |
| 6075369 | Defibrillator system condition indicator with an electrode interface A defibrillator and electrode system that gives the user a visible and/or audible indication of the condition of the electrodes and other parts of the defibrillator system prior to deployment of the electrodes and use of the defibrillator. In a preferred ... | 06/13/2000 |
| 6031369 | Electricity meter having circuitry for selecting the conditioning of a power signal according to the polarity of an A.C. mains signal An electricity meter including a circuit which receives a first A.C. signal having a magnitude dependent on power passing through a conductor, and a mains A.C. signal. While the mains signal is positive, first pulses are generated at a rate dependent on t... | 02/29/2000 |
| 5808902 | Power quality transducer for use with supervisory control systems A method and apparatus for detecting power quality or disturbance events, such as voltage swells, sags or impulses, in power signals at remote locations of a power distribution system and for conveying information relating to the power disturbances to a c... | 09/15/1998 |
| 5740063 | Measuring instrument A measuring instrument has first and second memories for storing measured data. A display displays the measured data stored in the first memory. When a new measured data is obtained in the measuring instrument, the measured data is written in the first me... | 04/14/1998 |
| 5523676 | Sample and hold method and apparatus for sensing inductive load current An inductive load energized by a variable duty cycle pulse signal contains ripple at steady state conditions, and the average current is used as feedback to a controller. The average current is obtained without filtering by synchronously sampling the loca... | 06/04/1996 |
| 5508607 | Electronic test instrument for component test A "component test" function is provided in a low-power, portable test instrument like a digital multimeter. A test stimulus waveform is synthesized digitally, and a digital trigger signal from the synthesizing circuitry is used to trigger acquisition of m... | 04/16/1996 |
| 5493228 | Method and device for measuring and recreating the load current in a power network in connection with the occurrence of faults A method and a device, after a fault has occurred in a power network, for measuring and recreating the phase currents IB prior to the occurrence of the fault by determining continuously, starting from sampled measured values of the phase curren... | 02/20/1996 |
| 5311117 | Meter for accurately measuring integrated electric power In a watt-hour meter in which first and second input signals representing an analog electric current and an analog voltage of an alternating current are converted into first and second digital signals, a first adder produces a sum signal which represents ... | 05/10/1994 |
| 5311123 | Method of measuring the instantaneous shaft velocity of a rotary machine A method of measuring the instantaneous shaft velocity of a rotary machine having a shaft with a plurality of circumferentially spaced markers thereon, comprises the steps of sensing the passage of the markers with at least two circumferentially spaced se... | 05/10/1994 |
| 5300889 | Ground-free electrostatic measurement device with electrical charge storing capacitor A ground-free device for measurement of electrostatic potentials on objects. The device is based on the fundamental concept that the static charge on most objects can be estimated by means of a discharge terminal equipped with a capacitor.... | 04/05/1994 |
| 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, and error cancellation technique allows ultra accurate me... | 11/09/1993 |
| 5214319 | Monotonic pulse detector A pulse detector keeps track of the peak value of an analog input signal and clocks output data pulses into a flipflop and shift register at peak values thereof while it monotonically increases in magnitude for each polarity. The data input to the flipflo... | 05/25/1993 |
| 5163172 | Procedure and apparatus for the measurement of the currents in a frequency converter A procedure and apparatus for the measurement of the currents in a frequency converter, provides that the phase currents of the frequency converter are measured by storing, in memory, signals corresponding to the current of the d.c. circuit of the convert... | 11/10/1992 |
| 5132609 | Circuit for measuring the level of an electrical signal and including offset correction means, and application thereof to amplifiers having automatic gain control A measurement circuit for measuring the level of an input electrical signal, the circuit comprising an input amplifier biased from a bias voltage, receiving the input signal, and producing an output signal, followed by a detector module itself followed by... | 07/21/1992 |
| 5128610 | Current-to-frequency converter A current-to-frequency converter 12' (FIG. 3) for use with an accelerometer 10 comprises a storage capacitor 13 which receives the accelerometer current and develops a charging voltage, reset charging means 25 which delivers timed charges to offset the vo... | 07/07/1992 |
| 5121051 | Method and apparatus for measuring small electrical signals A method of and an apparatus for measuring small electrical signals with a computer-supported error-compensating measuring circuit (10) which includes a multiplexer (13), a following amplifier (15), an analog-to-digital converter (16) and a calculation de... | 06/09/1992 |
| 5079510 | Meter for accurately measuring integrated electric power In a watt-hour meter in which first and second input signals representing an analog electric current and an analog voltage of an alternating current are converted into first and second digital signals, a first adder produces a sum signal which represents ... | 01/07/1992 |
| 5068598 | Tension potential measuring circuit with selected time constant A circuit for measuring the tension of an electricity line, the circuit comprising a capacitive divider comprising first and second capacitors, first and second amplification lines for amplifying the tension across the terminals of the second capacitor, s... | 11/26/1991 |
| 5055773 | Detection and measurement of a DC component in an AC waveform DC offset is measured by separating the positive and negative half cycles of the AC waveform, obtaining a measure of the energy content of each type of half cycle and subtracting one from the other and accumulating the result. The accumulated result is me... | 10/08/1991 |
| 4992725 | Meter for accurately measuring integrated electric power In a watt-hour meter in which first and second input signals representing an analog electric current and an analog voltage of an alternating current are converted into first and second digital signals, a first adder produces a sum signal which represents ... | 02/12/1991 |
| 4943766 | Electric quantity detecting method A method of detecting amplitude value of AC electric quantity in electric power system, where five sampling values obtained in sampling performed in sequence at a period of 1/4 of the period of the rated frequency of the AC electric quantity are used, and... | 07/24/1990 |
| 4914382 | High voltage measuring circuit coupled to the capacitive grounding tap bushing of an HV device A high voltage measuring circuit for broadband measurement of transient signals occurring in high voltage apparatus. The measuring circuit is housed in a shielded housing having an input sensing circuit for connection to a capacitive grounded tap of the h... | 04/03/1990 |
| 4910456 | Electronic watt-hour meter with combined multiplier/integrator circuit An electronic watt-hour meter includes a multiplier/integrator circuit which performs "pulse height-pulse width" multiplication of current and voltage and simultaneously integrates the product of this multiplication to generate packets of electrical charg... | 03/20/1990 |
| 4884022 | Voltage testing device attachable to the blade terminals of a power meter A voltage monitoring device is adapted to fit within or be mounted externally of the housing of a standard electricity meter. The device repeatedly monitors the voltage of the mains supply, stores data derived from the measurements for consecutive predete... | 11/28/1989 |
| 4864224 | Measuring method for determining the difference between an A-C voltage and another voltage, as well as a measuring device for carrying out the same A method for measuring the difference between two voltages with a time-controlled measuring cycle includes feeding two voltages with opposite polarity to one integrator, initially integrating up one of the voltages and subsequently integrating down the ot... | 09/05/1989 |
