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| Number | Title | Issue Date |
| 5293156 | Hand tool driven by DC battery with multiple level battery condition indicator A hand tool driven by a DC battery comprises a tool driving section having a motor, a DC source connected to the tool driving section, a plurality of LEDs connected to the DC source, an LED turning-off section for sequentially turning off the LEDs in acco... | 03/08/1994 |
| 5293113 | Test instrument for the display of electric voltages A testing device for single-pole voltage testing comprises, between a test electrode (1) and a ground electrode (2), a high impedance dropping resistor (R1) and a measurement resistor (R2) connected in series. The ground electrode (2) is capacitively coup... | 03/08/1994 |
| 5289166 | Voltage detector A voltage detector to sense deviations of instantaneous value of a monitored voltage from a desired value is provided. The system includes a reference voltage source for providing a reference voltage. A divider responsive to the monitored voltage and the ... | 02/22/1994 |
| 5272445 | Resistance tester utilizing regulator circuits A portable resistance tester comprises a pair of regulator circuits used to drive a bridge circuit and a detector circuit when measuring the resistance values of "in-circuit" test nodes. The tester produces an audible signal when the resistance of a measu... | 12/21/1993 |
| 5265022 | Engine protecting system A system for protecting an engine equipped with an electronically controlled fuel injection apparatus, in which a battery voltage is detected. When the detected battery voltage is smaller than a predetermined reference value, performance of the engine is ... | 11/23/1993 |
| 5248967 | Method and apparatus for monitoring electrical devices The condition of signal lamps (R1, R2) in a traffic light system is monitored by compiling a table of power consumption levels at different levels of applied voltage. The table is then used to adjust measured levels of power consumption at intervals durin... | 09/28/1993 |
| 5243330 | Fire detector system and method A fire detector system including ionization smoke detectors (7) is provided with improved false-alarm protection. The system includes an ionization chamber (1) with a radioactive source (10), connected in series with a resistor (2) between power supply li... | 09/07/1993 |
| 5233329 | Filter with hysteresis for trip point applications A circuit including a sender providing a sender output signal responsive to a vehicle parameter, circuitry for providing an adjustable reference, circuitry for comparing the output signal to the adjustable reference and providing a comparison output signa... | 08/03/1993 |
| 5229651 | Method and apparatus for line power monitoring for uninterruptible power supplies AC line monitoring is provided for uninterruptible power supplies to detect AC power system line faults by comparing the presently received cycle of the AC power line signal with a reference waveform. The reference waveform is formed of a composite of wav... | 07/20/1993 |
| 5225811 | Temperature limit circuit with dual hysteresis A temperature limit circuit has a pair of comparators for producing an output signal when a sensed temperature either exceeds of falls below a permissible range. A common impedance circuit uses a single output pin to establish both the upper and lower tem... | 07/06/1993 |
| 5225808 | Long range intruder sensor The apparatus of the invention includes a collapsible antenna for detecting the electric field associated with the individual. A current-to-voltage operational amplifier is coupled to the antenna. The amplifier includes an inverting input, a non-inverting... | 07/06/1993 |
| 5218339 | Arrangement for monitoring a consumer in combination with an internal combustion engine and/or a motor vehicle An arrangement monitors a consumer in combination with an internal combustion engine or motor vehicle especially for monitoring an electric drive which is driven by an output stage in the form of a bridge circuit. Potentials are compared in the area of th... | 06/08/1993 |
| 5218298 | Two-terminal-hall-sensors monitoring system for providing decoded magnetic field amplitude signals and system diagnostic signals A magnetic-field monitor includes a Hall sensor of the kind having a voltage reference terminal and a signal output terminal for being energized by applying a DC voltage across the output terminal and the reference terminal, and generates through the outp... | 06/08/1993 |
| 5210527 | Programmable spike detector A programmable spike detector is designed to detect spikes in a test signal in a device under test. The spike detector includes a differential amplifier which provides a difference signal representing the difference in voltage between the test signal and ... | 05/11/1993 |
| 5182511 | Detector circuit for detecting a phase signal of a polyphase alternator for a battery charge regulator in a motor vehicle, and utilization thereof A detector circuit for detecting a phase signal of a polyphase alternator for a battery charge regulator in a motor vehicle. The circuit includes differential signal amplitude discriminator means for discriminating between at least one pair of phase signa... | 01/26/1993 |
| 5175531 | Battery condition monitoring system for batteries connected in parallel Disclosed is a battery condition monitoring system that monitors the condition of batteries connected in parallel in order to determine that each battery is generating the necessary power. The system determines the difference in voltages that are proporti... | 12/29/1992 |
| 5168236 | Fault detection circuit for use in determining the existence of a fault in any one of a plurality of multi-phase loads A fault detection circuit for a plurality of three-phase loads uses a wye-connected reference load as a benchmark. The voltages at the centerpoints of the loads to be monitored are monitored and the largest monitored voltage is identified. This largest vo... | 12/01/1992 |
| 5140305 | Speed sensor failure detection method and apparatus for an overspeed protection system An apparatus for detecting speed sensor failure in an overspeed protection device is disclosed. The apparatus comprises a plurality of tachometers having outputs for indicating the speed of rotation of a machine relative to plural setpoints. If the compar... | 08/18/1992 |
| 5130699 | Digital battery capacity warning device A voltage monitor and method enables the monitoring of a DC input voltage. The input voltage is continuously scanned and compared to a predetermined threshold. The result of the comparison is periodically stored in a shift register along with previous sca... | 07/14/1992 |
| 5121108 | Circuit arrangement for monitoring two operating voltages A circuit arrangement for monitoring two operating voltages of different polarity detects and indicates the deviation of either operating voltage from its nominal value beyond a predetermined tolerance limit. A transistor is provided, whose base is connec... | 06/09/1992 |
| 5119073 | AC ripple meter An apparatus and method are disclosed for measuring and displaying the percentage of ac voltage ripple present on a direct current input voltage. In addition, the apparatus can be set to activate alarms and trip relays when the percentage of ac voltage ri... | 06/02/1992 |
| 5079688 | Transformerless power monitor circuit having means for electronically latching DC alarms In a power monitor circuit, AC power-line voltage is converted by a DC power supply to a regulated DC voltage. The DC power supply shuts down itself in the event of a failure therein. The output of DC supply rises from zero to a specified value in slow re... | 01/07/1992 |
| 5077629 | Switch with pre-alarms means In a switch with pre-alarm means (101) having pre-alarming apparatus (20, 21) and an indicator (103) for alarming that value of current flowing on a load is above a predetermined alarming level, output of the pre-alarming apparatus is held at a predetermi... | 12/31/1991 |
| 5047751 | Power supply voltage monitoring circuit A power supply voltage monitoring circuit for use in a semiconductor circuit which is used with a plurality of power supply systems and is operable by switching the high and low power supply voltages, includes at least two power supply lines, a reference ... | 09/10/1991 |
| 5039978 | Analog graphic display method and apparatus An apparatus and method for using an output device such as an LED to show the approximate analog level of a variable electrical signal wherein a modulating AC waveform is superimposed either on the signal or a reference voltage, both of which are then fed... | 08/13/1991 |
| 5032826 | Core monitor that uses rotor shaft voltages The present invention is a monitor that detects generator core 12 hot spots where the insulation between ferromagnetic sheets is breaking down by monitoring rotor 10 shaft voltage. The difference between the differential shaft voltage at each end of the r... | 07/16/1991 |
| 5032827 | Device for monitoring a variable electric signal and a component for such a device A device is disclosed for controlling a variable electric signal. A first switch receives the monitored variable electric signal at its input. A second switch receives a first limit electrical signal for the monitored signal and a first minimum reference ... | 07/16/1991 |
| 5019996 | Programmable power supply level detection and initialization circuitry An apparatus for a signal processing system connected to a power supply having an output level and receiving a clock signal, that is responsive to the output level of the power supply, generates control signals for use as interrupt signals, reset signals ... | 05/28/1991 |
| 5017874 | Method and apparatus for detecting and indicating anomalies in the operation of the ignition systems of internal combustion engines The method and apparatus allows the detection and indication of anomalies in the operation of the ignition system of an internal combustion engine including a plurality of spark plugs, each of which receives a periodic high-voltage pulse output by a high-... | 05/21/1991 |
| 5001364 | Threshold crossing detector A method and apparatus is disclosed for forming a binary level output signal which has a single transition representative of a threshold crossing in a sensor output signal. The sensor output signal is applied to the inputs of two signal processing circuit... | 03/19/1991 |
| 4996520 | Overvoltage detection test apparatus for military aircraft weapons systems The test apparatus of the present invention tests the power supply on a military aircraft, which power supply provides power to missiles carried by the aircraft. The apparatus tests for an overvoltage condition, wherein the power supply output exceeds the... | 02/26/1991 |
| 4994792 | Fluid temperature monitoring system A fluid temperature monitoring system is characterized by an adjustable variable voltage divider for selecting a desired temperature range, a temperature detector for detecting whether the fluid temperature is above, below, or at the desired range, and a ... | 02/19/1991 |
| 4983954 | Shock hazard warning device A warning device (10) is provided for use by electrical technicians or the like to indicate the presence of an electrical shock hazard. The warning device is adapted to be worn on the wrists or the like and includes a filtered detection circuit (32,34) fo... | 01/08/1991 |
| 4983955 | Electric power supply circuit monitoring systems Monitoring an electric power distribution circuit having a rated load capacity includes continually sensing an intensity of electric power supplied through that circuit. In response to that sensing a first signal indicating when electric power is supplied... | 01/08/1991 |
| 4977530 | Voltage monitor for in-circuit testing In a circuit tester for applying test voltage to circuit components, a voltage monitor for detecting potentially destructive voltages being applied to one or more additional circuit components other than the components being tested, and in response genera... | 12/11/1990 |
| 4962350 | Load condition detecting and driving system A load condition detecting a control system for supplying a load current to a load from a power source wherein, when said load exhibits a short circuit condition, a driving signal controlling the application of high current to the load is immediately pull... | 10/09/1990 |
| 4951030 | Monitoring system A thread motion monitoring system wherein the presence or absence of thread motion for discrete threads is detected and signals developed in terms of the failure, non-thread motion, of selected numbers of threads.... | 08/21/1990 |
| 4929886 | Apparatus for detecting noise in the measurement of very small resistance A pair of a first and a second R-C integrating circuits connected in series. A first switch S1 supplies a first combined voltage E1 +E3 of a first positive threshold voltage E1 and a positive initial set up volt... | 05/29/1990 |
| 4916570 | Voltage comparator circuit for monitoring a process output voltage within a preset range A fluctuating voltage to be monitored is fed to the non-inverting input of a first op amp via a first input resistor; a reference voltage is fed to the inverting input of the second op amp via a second input resistor. The inverting input of the first op a... | 04/10/1990 |
| 4879625 | Voltage monitor Voltage monitor for monitoring the output voltage of a power source which can be connected to a power load, which includes a reference voltage source, comparators for comparing the power source voltage with the reference voltage, switches between the powe... | 11/07/1989 |
