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Your location: Home > Related Articles > New standard analog analysis of digital test instruments

New standard analog analysis of digital test instruments

Author:QINSUN Released in:2023-10 Click:71

In existing technology, the current detection of digital electric energy meters can only use the \"meter-meter\" comparison mode of similar digital meters. So-called standard digital electrical energy meters also speak for themselves and their standardization is difficult to verify effectively. Therefore, comparison The result lacks scientific validity and legal validity.
CN201607526 discloses a device for testing digital electric energy meters to realize digital energy source output. It uses a standard pulse map as a standard comparison. It still uses the “meter-meter” comparison mode, and its standardization has difficulty being effective. check. CN103048638 discloses a multifunctional inspection device for digital electric energy signals, comprising a digital power source and a pulse unit, which realizes transmissionsion and output of digital signals, detects and calculates the standard value of an externally connected signal source to be tested, but does not have the function of a real-time signal source and an analog power source.
The analog measurement and detection system for electric energy meters is a very mature and standardized system. If the analog measurement system can be used to detect digital electric energy meters, it can achieve one standard and two uses, reduce measurement costs and realize the detection of digital electric energy meters. .
In order to solve existing technical problems and realize an analog standard detection method of digital electric energy meter, the present invention relates to a new analog standard meter provided with an electric energy meter detection function digital and a detection method.
The technical solutionof the present invention is: a new analog standard meter with a digital electric energy meter detection function, comprising an analog-to-digital A/D converter, a DSP unit, an IEC61850 data modulator, an IEC61850 demodulator data /FT3, error calculator. Preferably, it also includes a display and human-machine interaction unit, a microprocessor and an interface unit for controlling the display and human-machine interaction unit.
The analog-to-digital A/D converter, IEC61850 data modulator, IEC61850/FT3 data demodulator, microprocessor and error calculation unit are all connected to the DSP unit. The display and human-machine interaction unit, the interface unit and the micro processor are connected; the pulse output interface of the DSP unit and the pulse output interface of the digital electric energy meter under test are connecteds to the error calculator input interface.
The analog-to-digital A/D converter and DSP unit are connected for standard calibration/traceability of analog electric energy meters; the analog-to-digital A/D converter is connected to the IEC61850 data modulator for offline detection of digital electric energy meters; The IEC61850/FT3 demodulator is connected to the DSP unit for online verification and comparison of on-site digital energy meters, electronic mut dual inductance inspection and DSP calculation function verification. Through IEC61850 input/output port, electric energy pulse input/output port and analog signal channel, a measurement traceability/transmission and verification system can be formed to complete the measurement system. standard traceability of digital meter/value transfer network system.
The DSP unit includes a module of ansignal analysis, a module for calculating electrical parameters and a module for calculating electrical energy. The signal analysis module, electrical parameter calculation module and electric energy calculation module are connected; Analog-to-digital A/D converter, the IEC61850 data modulator and the IEC61850/FT3 data demodulator are connected to the signal analysis module, the error calculator is connected to the electric energy calculation module, and the Electrical parameter calculation module and electric energy calculation module are connected to the microprocessor. Through the signal analysis of the DSP unit and the IEC61850/FT3 data demodulator, the inspection function of the digital output electronic transformer can be realized. At the same time, the DSP unit and the display and human-machine interaction unit realize the three-phase electrical parameters voltage, current, frequency, phase, power et other measurement parameters and synchronous display functions.
The analog-to-digital A/D converter, IEC61850 data modulator, IEC61850 data demodulator and DSP unit are connected via data bus, and the data transmission speed is fast. Preferably, the display and human-machine interaction unit, the interface unit and the microprocessor are connected via a data bus, and the DSP unit and the microprocessor are connected via a data bus. The analog-to-digital A/D converter has 6 channels, which respectively receive three-phase voltage and three-phase current analog signals, and realize the three-phase voltage and current analog signal input interface.
The interface unit includes a USB interface, an RS232 interface and an Ethernet interface. USB interface, RS232 interface and Ethernet interface are all connected to the microprocessor. Thanks to the interface unit, the preThis invention can transmit data with external devices. The display and human-machine interaction unit includes a display screen, buttons, keyboard and mouse, which facilitate the detection of digital energy meters.

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