391 results about "Wattmeter" patented technology

A lighting control system is operable to control the amount of power delivered to a plurality of electrical loads. The lighting control system includes load control devices (such as digital electronic dimming ballasts), motorized window treatments, controllers, processors, and personal computers. The personal computer is preferably executing a graphical user interface (GUI) software, which allows a user to configure and monitor the operation of the lighting control system. The lighting control system offers a load shedding functionality without using power meters. Each load control device transmits its current intensity level to the personal computer, which is operable to determine a total power consumption of the lighting control system. If the total power consumption exceeds a predetermined power threshold, the personal computer causes the load control devices to shed loads.

A power meter reader system for automatically reading an indication on a power meter unit having a cyclical property that varies at a rate indicative of power consumption. The system comprises a detection unit that includes a sensor unit for monitoring the cyclical property of the indication and generating a consumption detection signal, a processing unit for generating an information signal based on data related to the consumption detection signal, and a transmitter for transmitting a transmission signal based on the information signal. The processing unit also generates a sensor enable signal to enable the sensor unit for only a portion of the cyclical property of the indication. The system further includes a display unit located remotely with respect to the detection unit for receiving the transmission signal and displaying the power consumption. The detection unit may also employ a prediction model for reducing power consumption in the detection unit.

A power meter has a measuring circuit composed entirely of analog components that measures the instantaneous current draw of one or more electrical devices, such as home appliances. The power meter may be in the form of a hand-held device that includes elongated connections that allow a homeowner to measure the current draw of an electrical device without significant displacement of the electrical device. In addition to measuring current draw, the power meter may provide an estimated wattage consumed by the measured electrical devices.

The disclosure relates to a meter for monitoring usage of power provided by a power transmission system to a site. The meter comprises: a meter module connected to a power feed associated with the power transmission system to provide readings relating to the power; a messaging module to provide messages to the power transmission system; a connection to an alternating current (AC) power supply; a rectifier circuit connected to the AC power supply to generate a direct current (DC) power signal; a capacitive circuit connected to an output of the rectifier circuit, the capacitive circuit including a capacitor for storing a voltage for temporarily providing replacement power for the rectifier circuit; and a switching regulator circuit connected to the output of the rectifier circuit and the capacitive circuit, the switching regulator converting the DC voltage signal to a stepped down voltage signal for the meter module.

A power meter is provided in which calibration is carried out as an automated procedure controlled by the meter.

Methods and systems are described for determining a phase of transmitted voltage. In one embodiment, a power distribution system may operate to transmit voltage and an injected signal. The system may also include a power meter that may receive the voltage and injected signal. The power meter may determine a phase of the received voltage based on the received voltage and the injection signal.

The invention provides a power calibration test system. The power calibration test system comprises a system setting device for setting target power and a target frequency band, a power meter connected with the system setting device and used for measuring output power in cooperation with a power sensor, a microwave vector network analyzer connected with the power meter and used for generating microwave signals, a frequency multiplier connected with the microwave vector network analyzer, a three-port directional coupler connected with the frequency multiplier, and a harmonic mixer connected with the microwave vector network analyzer and the three-port directional coupler. By means of a closed loop feedback loop, real-time closed loop monitoring and adjustment on input power of the reference plane of an input port of a component to be tested are achieved, real-time closed loop calibration on power within any frequency band and accurate measurement on circuits and devices can be achieved, and the universality, effectiveness, consistency and accuracy of the power calibration test system are largely improved.

The invention provides a server integration method oriented to minimum energy consumption. The server integration method oriented to minimum energy consumption includes that resource states and performance data of servers and virtual machines on the servers are periodically obtained, and meanwhile, energy consumption of the servers is periodically measured by an external-connected wattmeter on a physical server to be stored; resource state data of the servers, resource state data of the virtual machines, performance data of the servers and the performance data of the virtual machines are periodically collected, and data pre-processing is performed; a server energy consumption model is established; a virtual machine transfer cost prediction model is established; transfer cost prediction value of each virtual machine is obtained; virtual machine comprehensive assessment is performed by means of an improved analytic hierarchy process; service stability index of the servers is calculated; a server integration scheme is determined; server integration is performed. According to the server integration method oriented to minimum energy consumption, the virtual machines are transferred to proper servers by means of a dynamic packing algorithm according to virtual machine resource required quantity and server resource surplus, and the number of starting servers is the minimum under the condition of stable service operation.

The invention relates to an online calibration method for a radio frequency front-end receiving-transmitting link, including radio frequency signal receiving calibration and radio frequency signal transmitting calibration. The radio frequency signal receiving calibration comprises the following steps: calibration setting is initialized; an internal calibration source enters a directional coupler at an input end and obtains a power meter reading of a receiving link; and signal power of a signal processing unit is compared with a power meter measurement result to obtain a power calibration factor. The calibrated radio frequency input signals can be measured by switching a single-pole multi-throw switch to a radio frequency input path, testing the calibrated frequency band and compensating corresponding calibration parameters. The radio frequency signal transmitting calibration comprises the steps of generating transmission baseband signals, calibrating I, Q imbalance of a transmitting link, calibrating output power, and compensating calibration parameters. In the module designed by the invention, radio frequency signal transmitting and receiving can be calibrated in real time without need for external equipment. The calibration of a portion of devices can be omitted in the production process of modules and time for module production can be shortened.

The error of a measurement system can be corrected even if the frequency of an input signal of a device under test is different from that of the output signal. A signal output acquiring section acquires the power of the input signal by means of a power meter not shown in the drawing. Thus, errors due to frequency tracking can be separated depending on the direction in a signal flow graph. Since a receiver measures the parameter concerning the received signal when a signal source is directly connected to receiving means, the measurement system error factor of the receiving means can be acquired. The parameter of a device under test can be measured while the error is corrected when the results of measurement, concerning the device under test of receivers are combined.

A processing machine processes a work and repeats processes on the work, thereby consuming energy. Within the consumed energy, room for improvement is computed by an energy monitoring device and is referred to as an amount of energy that can be improved. An energy monitoring device includes a power data acquirer that acquires a time-series power data measured by a power meter, a cycle detector that detects a single-cycle power data from the power data acquired by the acquirer, a divider that divides the single-cycle power data detected by the detector into an added-value creating portion and an unproductive portion, and a computing unit that computes an amount of energy consumed in the unproductive portion divided by the divider and defines it as the amount of energy to be improved.

An electric power management system includes a power meter connected to a power system of a commercial power source and a power conditioner connected to the power meter, a power generating device and an electric appliance. The power meter and the power conditioner are configured to exchange power information through a communications part at the side of the power meter.

A power meter is disclosed. The power meter may be used to determine the electric power being delivered by a conductor. In one such power meter there is a substrate, an inductive pickup coil attached to the substrate, a conductor, and a detector. The pickup coil may be printed on the substrate.

A method for power load management is provided in the present invention, wherein two different standard values are determined to be a basis for regulating power consumption. When power consumption exceeds a first standard value, a monitoring procedure is started to monitor consumption status. If the power consumption exceeds a second standard value, an unloading procedure is processed to reduce the power consumption of electrical devices under operation. In another embodiment, the present invention also provides a system for power load management comprising a control unit coupled to at least one electrical device and a power meter. By means of real-time recording of power consumption in the power meter, the control unit is capable of determining the power consumption status and determining whether it is necessary to unload or reload the at least one electrical device.

The invention discloses method for testing sensitivity of a wireless communication product in an ISM (Industrial, Scientific and Medical) frequency band, relating to methods for testing the sensitivity of the wireless communication products and solving the problem of low accuracy in a sensitivity test because the traditional method cannot simulate an actual condition. In a system I, signals emitted by an emitter are input into a receiver through an adjustable attenuator and a fixed attenuator. In a method I, the error rate from the adjustable attenuator to the receiver is adjusted to determine whether a preset error range is reached, and the sensitivity of the receiver is calculated. In a system II; the signals emitted by the emitter are input into the receiver after being processed by the adjustable attenuator I, a power distributor, a combiner and N adjustable attenuators II. In a method II, the reference attenuation values of the adjustable attenuators are respectively adjusted, the length of a transmission line is adjusted to make the receiver in a critical state, and a power meter is adopted to test the received signal power of the receiver and calculate the sensitivity of the receiver. The systems and methods disclosed by the invention are suitable for testing the sensitivity of the wireless communication products in the ISM frequency band.

A power meter having fault tolerance enhances the monitoring of electrical power by increasing the reliability of data output by the power meter having fault tolerance. The power meter having fault tolerance may enhance the monitoring process by transitioning from a faulty power monitoring device to a non-faulty power monitoring device without losing or corrupting power management data.

The invention discloses a test device and a test method for broadband radiated immunity of a vehicle display device as well as application. The test device is provided with a radio frequency interference signal source, a first coaxial radio frequency switch, a low-frequency section power amplifier, a high-frequency section power amplifier, a forward power meter, a backward power meter, a second coaxial radio frequency switch, a third coaxial radio frequency switch, a first oriented coupler, a second oriented coupler, a fourth coaxial radio frequency switch, a 20MHz-200MHz low-frequency bi-conical antenna, a log antenna, a horn antenna, a field strength meter, a camera, a high-speed image acquisition card, a radio frequency switch control module, a serial port expansion card, a control host machine, a GPIB (general purpose interface bus) interface card and the vehicle display device. During testing, a broadband radio frequency interference signal is generated by a radio frequency interference signal source, the control host machine is used for judging the frequency section of the frequency of the interference signal, on the basis of the frequency section, the control host machine is used for controlling the radio frequency switch control module to automatically switch the coaxial radio frequency switches, so that the radio frequency signal source is enabled to be connected with the corresponding power amplifier and the corresponding antenna, and the forward power meter, the backward power meter and a video monitoring device are respectively used for the online monitoring of the testing field strength and the working state of tested equipment.

The invention provides an online BTM detection method and apparatus. The apparatus comprises a detection host, a display unit, a signal simulator, a spectrum analyzer, a radio frequency power meter, apower supply and a detection vehicle; when overhaul is performed in a bullet train garage, the BTM device does not need to be detached, comprehensive detection is directly performed on a BTM antenna,a cable, a host and other components, and analysis and diagnosis and detection report output can be performed on each detection result; in addition, the online BTM apparatus can establish a historical detection account with the equipment as an object, performs statistic analysis in numerical values, curve charts and other forms for tracking and analyzing the performance change process of each BTMdevice; and the online detection of the BTM device is similar to regular fixed point physical examination, which can effectively help an overhaul unit to find the hidden dangers of the performance ofthe device and take measures in time.