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| Number | Title | Issue Date |
| 7932713 | Method and apparatus for amplifying a signal and test device using same An amplifier circuit is used in a multimeter to amplify signals applied between a pair of test terminals. A voltage applied to one of the test terminals is amplified by a first operational amplifier configured as a voltage follower. An output of the first operationa... | 04/26/2011 |
| 7928721 | Method and apparatus for amplifying a signal and test device using same An amplifier circuit is used in a multimeter to amplify signals applied between a pair of test terminals. A voltage applied to one of the test terminals is amplified by a first operational amplifier configured as a voltage follower. An output of the first operationa... | 04/19/2011 |
| 7928722 | Apparatus and method for voltage sensing in electrical metering systems A voltage isolation circuit. The input voltage Vin is connected to a primary winding of a transformer T1 through a current limiting resistor R1. R1 is preferably sized such that the current flow in the primary at nominal input voltage is approxi... | 04/19/2011 |
| 7123104 | System and method for measuring current The present invention is directed to a system and method for measuring a current in an integrated circuit comprising measuring a first output count from a first voltage controlled oscillator (VCO) using a first measurement voltage, simultaneously measuring a second ... | 10/17/2006 |
| 6928866 | Device for the measurement and monitoring of a process parameter The invention concerns a device for measuring and/or monitoring a process parameter, with a sensor, an intermittently working measurement circuit, which has at least one energy storer unit, wherein the measurement circuit or individual components of the measurement ... | 08/16/2005 |
| 6778919 | Method for identification of an oscillation in an electrical power supply system The invention relates to a method for producing at least one signal (oscillation signal), which indicates an oscillation in an electrical power supply system. In order to allow the oscillation behavior of an electrical power system to be detected safely and reliably... | 08/17/2004 |
| 6365914 | Semiconductor device provided with a built-in minute charge detecting circuit A semiconductor device has a minute charge detecting circuit and a test circuit for suppressing harmful influence of stray capacitance and external noises during detection of a minute electric charge. The minute charge detecting circuit is constructed of ... | 04/02/2002 |
| 6271744 | Current sensing arrangement with encircling current-carrying line and ferromagnetic sheet concentrator A current sensing arrangement (10) includes a Hall effect sensor (16). A current-carrying line (14) of the arrangement (10) encircles the Hall effect sensor (16). A ferromagnetic sheet material (32) of the arrangement (10) covers a portion of the current-... | 08/07/2001 |
| 5523679 | Apparatus for detecting speed and direction of rotation with a single magnetic sensor The invention relates to a process and apparatus for detecting the speed and rotary direction of a rotary drive by using a signal-transmitting or signal-changing element which is connected rotationally secured to the rotary drive. According to the inventi... | 06/04/1996 |
| 5307008 | Current ratio device and toroidal core assembly therefor A current ratio device is used for forming a current transformer that can accurately scale down high currents to usable metering levels. The transformer has associated circuitry that renders it capable of functioning not only with ac and a mixture of ac a... | 04/26/1994 |
