45results about How to "Easy production and debugging" patented technology

The invention is a direct-digital pressure transmitter, including the capacity presure sensor; the resonant circuit used to receive the capacity changing value and directly transform it into the oscillation frequent signal; the SCM, the external RAM and the input equipment, used to adjust the measuring range and input the measuring parameters; the display cell. The method as follows: initialization setting, and operation and judgement according to the input key value: if measurement, directly get the pulse frequency and make the interpolation operation to get the pressure value, then display the result, if parameter setting, read in the given pressure value and measure the pulse frequency and calculate the corresponding pressure value and save it to RAM.

The invention relates to a leakage monitoring chip for a leakage protector. The leakage monitoring chip comprises a power voltage regulator circuit, a reference voltage generator and a latching output circuit, wherein the power voltage regulator circuit is used for providing working voltage for the reference voltage generator and the latching output circuit; the leakage monitoring chip further comprises a circuit structure and a first amplifying circuit and a second amplifying circuit which have the same performance; an input end of a first differential amplifier circuit is electrically connected with an input end of a second differential amplifier circuit, and the end is used as the public input end to connect with an external circuit; the other input end of the first differential amplifier circuit is connected with the external circuit; the other input end of the second differential amplifier circuit is connected with the external circuit; the output end of the first amplifying circuit and the output end of the second amplifying circuit are electrically connected with the input end of the latching output circuit respectively; the reference voltage generator circuit is used for respectively providing reference voltage for the input ends of the first differential amplifier circuit and the second differential amplifier circuit. The leakage monitoring chip provided by the invention has the advantages that the leakage faults of the main loop and the ground wire can be monitored synchronously; and the two fault action current can be adjusted randomly in the scope of national safety standards; the leakage monitoring chip works stably and reliably and the personal safety can be more effectively protected.

The invention discloses a gas ratio proportioning valve, a multi-gas ratio proportioning combination valve and a gas proportioning system. The proportioning valve consists of a valve body and a valve disk, wherein the valve body is provided with three cavities of which the centers are coaxially communicated, and the valve disk is provided with flow control channels. The valve disk moves in the cavities of the valve body, and the complete linear relationship of the concentration of mixed gas with the shift of the valve disk is realized. The multi-gas ratio proportioning combination valve consists of a plurality of gas ratio proportioning valves, wherein all main gas inlets are communicated, all mixed gas outlets are communicated, and auxiliary gases enter from the respective auxiliary gas inlets. The gas proportioning system comprises the gas ratio proportioning valve or the multi-gas ratio proportioning combination valve. According to the invention, the simple structures of the valve body and the valve disk are combined, the widths of the outlets of the main and auxiliary control channels in the valve disk are matched with the densities of the gases which need to be proportioned, and high-precise mixed bi- and multi-gas can be obtained through the control of only one button without a gas analyzer. The invention has high practical value and can be broadly used in mixed gas proportioning industry.

The invention discloses an oscilloscope analog front-end impedance transformation circuit with a program-controlled calibration function. A program-controlled current source to a negative power supply is added to the emitter of a high-frequency crystal triode. Under the condition that the DC gain remains unchanged, the current of the program-controlled current source is adjusted through the program control, thereby adjusting the emitter current of the high-frequency transistor of the output stage in the impedance transformation circuit, so that the AC gain of the impedance transformation circuit is equal to the DC gain. Before leaving the factory, the current of the program-controlled current source is adjusted so that the AC gain of the impedance conversion circuit is equal to the DC gain. There is no need to manually adjust the bias resistance, and it is not necessary to disassemble the machine, which is convenient for production and debugging. In addition, when the input static resistance of the post-stage programmable variable gain circuit changes, it can be dynamically adjusted, which overcomes the prior art and is not suitable for the situation where the post-stage load RL changes dynamically.

The invention provides a piece of equipment for debugging a single frequency network and a method for debugging a single frequency network. Controls comprise a single chip microcomputer, a demodulator, a port, a power supply, button displays and the like; and the controls are structured by using an equivalence processing method of time domain synchronization or frequency domain transformation so as to control a specified data bit of a transmitted waveform. With the controls and method for debugging the single frequency network provided by the invention, a phase of the specified data bit in a debugged low-frequency signal is observed and compared to judge the synchronization performance of a high-frequency carrier and adjust the carrier; a common oscilloscope with a low price is used for observing and adjusting the phase so as to complete the debugging of the single frequency network, therefore expensive oscilloscopes above 500 MHz do not need to be used; the production debugging, online networking of the equipment are convenient; the method is simple and fast; and the structured controls are portable, low in costs and easy to popularize.

The multiplexing compositor / allotter includes the fractional power input / output ports module, the connection load port module, the closed case, the transmission line module and the electrical connection module. The multiple cavities cascaded constitute the closed case. Each cavity is composed of the ambient side plates and one piece of the metal clapboard. The three sections of quarter-wave transmission line constitute one or two transmission lines. The joint point of the first section and the second section through the transmission line is connected to the load port module. Each transmission line module is suspended in the cavity respectively. The electrical connection module at each piece of metal clapboard connects the common ends of the transmission line in each cavity to each other.

A method for controlling internal serial port access of a multi-node device, comprising the following steps: according to an external serial port selection instruction, controlling the first CPLD of each node in several nodes to select one of the serial port paths of several serial port devices connected to it; A CPLD transmits the serial port device information corresponding to the selected serial port path to the MUX chip in the node; controls the MUX chip to select the output path according to the control command of the external serial port, and transmits the serial port device information through the node serial port path corresponding to the output path to The second CPLD in the corresponding management board; the management board controls the second CPLD to select the node serial port path of one of the nodes according to the switching command of the external serial port; the second CPLD transmits the serial device information corresponding to the selected node serial port path to the external serial port . The solution of the present invention can realize the access requirements for serial ports of all devices in the whole system on any management board, save the cost of the backplane and facilitate research and development, debugging and fault location.

The invention discloses a single-photon counting system for measuring weak luminescence of a dielectric medium, comprising a single-photon photoelectric converting module, an input signal photoelectric separating module, a pulse signal output module, an external triggering signal collecting module, a triggering threshold adjusting module, a field programmable gate array (FPGA) module and a peripheral component interconnect (PCI) interface module. In the system, theFPGA module is adopted, so that the complex control circuit is mounted in one chip, the volume of the device is reduced and the design of the circuit is simplified, thereby being convenient for producing and debugging; and simultaneously, in the system, the PCI interface and PC (personal computer) are adopted to transfer the data so as to satisfy the requirements for measuring the weak luminescence of polymers by means of the excellent communication speed and interference resistance of the PCI interface.