37results about How to "Realize the calibration function" patented technology

The invention belongs to the technical field of display, and specifically relates to a compensation structure of a drive circuit, a drive circuit module and a display panel. The compensation structureof a drive circuit includes a current amplification circuit and a cross-group amplification circuit, wherein the current amplification circuit is connected with the output terminal of the drive circuit, and is used for amplifying the drive current output from the drive circuit by a set multiple; and the cross-group amplification circuit is connected with the output terminal of the current amplification circuit, and is used for matching different channels in the drive circuit and the resistors of different thin film transistors, and converting the drive current into the corresponding drive voltage. The compensation structure of a drive circuit can directly sense the drive current of the pixel data in the display panel, thus avoiding the problem that a voltage signal is easy to be interfered during the wiring process, improving the sensing accuracy and reducing the sensing time, and at the same time utilizes the cross-group amplification circuit and uses the fuse technology to perform fine tuning on the resistors of all the cross-group amplifiers so as to realize the calibration function, thus avoiding the problem of occurrence of process deviation.

The invention relates to an instrument and method for measuring leaf areas, and provides an instrument and method for measuring a long-time-series field forest leaf area index (LAI). The instrument and method are used for solving the problem that an existing leaf area measuring method can not effectively obtain long-time-series data. A vertical rotation steering engine is arranged on a rotary table of a horizontal rotation steering engine and horizontally rotates along with the horizontal rotation steering engine, and a digital light intensity sensor is arranged on the vertical rotation steering engine; a time control part comprises a time control switch, the output port of a single chip microcomputer is connected with the horizontal rotation steering engine, the vertical rotation steering engine, an SD card and a display screen, the output end of the digital light intensity sensor is connected with the SDA port of the single chip microcomputer through a serial line, the output end of a clock module is connected with the SCL port of the single chip microcomputer through a serial line, and the output end of a power supply part is connected with the single chip microcomputer of a measuring part through the time control switch. The instrument is simple in structure, reasonable in design, and suitable for measuring the long-time-series field forest LAI.

An embodiment of the present invention provides a calibration device, a calibration method, and a monitoring system, wherein the calibration device includes a power device, a transmission device, an encoder, a magnet and a control board, and the power device drives the transmission device to rotate; The magnet is fixedly installed on the shaft center at one end of the transmission device; the encoder reads the rotation angle of the magnet; the control board is electrically connected with the power device and the encoder respectively. The calibration device, calibration method and monitoring system provided by the embodiments of the present invention can realize the automatic calibration function of the monitoring instrument.

The invention provides a temperature measuring device and method with a calibration function, the temperature measuring device with a calibration function includes a temperature measuring unit, the temperature measuring unit has a temperature measuring resistance and a proportional resistance; the testing unit includes: a fixed value resistor, the The fixed-value resistor has a connection terminal, which is suitable for being connected in series with the proportional resistor; the first memory is used to store the data transmitted from the temperature measurement unit and the results of the first processor; the first processor processes the temperature measurement unit The transmitted data; a power interface, the output end of the power interface is connected to the first memory and the first processor. The invention has the advantages of low cost, high temperature measurement precision and the like.

The invention belongs to the field of industrial process control, and particularly relates to a device and a method for automatic calibrating in a water treatment analog data collecting system, which solves the problems that the existing calibrating method for the water treatment analog data collecting system has big error, can't meet industrial standard, is complicated to operate, and is poorly universal. The automatic calibrating device includes a single chip control module, a DA conversion module, a VI transformation module, an LCD module, a keyboard input module and an analog input interface module. The calibrating method based on the device is that: the single chip control module controls the DA conversion module and the VI transformation module to form a standard current signal for the analog input interface module, the analog input interface module completes the communication between a to-be-calibrated analog input integrated circuit board and the single chip control module, so as to perform the data exchange between the analog input integrated circuit board and the single chip control module, the analog input integrated circuit board is calibrated under the control of the single chip control module as per the industrial standard current signal provided by the single chip control module, and the calibration error coefficient is stored.

The present invention relates to the technical field of spaceflight measurement and control, and specifically discloses a tower-less phasing method based on offset feed antennas to simulate target position characteristics, including performing phasing using target sources satisfying far-field conditions during equipment joint testing or tracking drills, After completion, transmit the frequency point signal through the bias feed antenna, feed the sum and difference signals into the downlink, and record the azimuth, elevation angle error voltage and polarity output by the demodulator; before tracking the target, transmit the frequency point signal through the bias feed antenna. point signal, adjust the phase shifter and gain control coefficients to make the magnitude and polarity of the azimuth and elevation error voltages equal to the previously recorded values. The invention can quickly realize the phase correction function before tracking satellites without a tower, the precision is equivalent to that of a standard calibration tower, and the phase correction process is simple.

The invention relates to an electric energy measuring circuit structure capable of achieving a function of pre-calibration of measurement accuracy. The structure comprises a reference module, a sampling module, an analog-digital conversion module, a clock and frequency conversion module, a digital signal processing module, a calibration register and interface circuit and a calibration module. The invention further relates to a method for achieving the pre-calibration of accuracy of the electric energy measuring circuit on the basis of the circuit structure. According to the electric energy measuring circuit structure capable of achieving the function of the pre-calibration of the measurement accuracy and the method, the function of calibrating the measurement accuracy of the electric energy measuring circuit is achieved, calibration structure is simple, adding of a large number of circuit sizes is not needed, when the electric energy measuring circuit structure is applied, an original electric watt-hour meter peripheral circuit is compatible with the structure completely, redesigning of a printed circuit board (PCB) is not needed, and meanwhile measurement accuracy of an electric energy meter can be improved effectively, correction table cost is reduced notably, and the electric energy measuring circuit structure is an effective and flexible choice in the field of electric energy measuring chips.