Disclosed are a laser transmission circuit, a laser transmission component and an electronic measuring instrument. The laser transmission circuit includes: an analog receiving unit, and a digital feedback path. The analog emission unit is configured to convert the accessed input analog signal into an analog laser signal, and emit the analog laser signal. The analog receiving unit is configured to convert the analog laser signal into an analog electrical signal as an output signal of the laser transmission circuit. An input end of the digital feedback path is connected to an output end of the analog receiving unit. An output end of the digital feedback path is connected to a feedback input end of the analog emission unit. The digital feedback path is configured to access the analog electrical signal output by the analog receiving unit, convert the analog electrical signal into a digital signal, and transmit the digital signal.

In a multiple interface, low power and lossy network comprising multiple nodes, a root phase device obtains phase differential and absolute phase information from the devices in various network paths. Each device in a network path determines the differential phase data compared to its parent device in a network path. The device transmits the differential phase data to the parent device. The parent device transmits the differential phase data up the network path toward the root phase device. The root phase device collects the differential phase data and transmits the data to a central device. The central device determines the absolute phase of all devices. The root phase device can propagate absolute phase information to all devices within the network. Each device determines the absolute phase data by comparing the phase data of the device with the absolute phase data. The phase data is transmitted to a central device.

An inverter and a method for identifying a fault on an alternating current side of a photovoltaic system are provided. A controller records a waveform of a preset parameter of the photovoltaic system, and then transmits the recorded waveform to an external device. The external device that performs relatively excellently in data storage and processing stores the waveform and performs subsequent processing, to accurately recognize the fault on the alternating current side of the inverter. Further, the fine waveform can be seen from the external device, so that the accuracy of system monitoring is greatly improved. Moreover, the external device analyzes the waveform and generates a control instruction to accurately control the inverter due to advantages of storage capacity, big data, and computing power. In addition, system performance can be optimized in cooperation with a local control unit.

An inverter and a method for identifying a fault on an alternating current side of a photovoltaic system are provided. A controller records a waveform of a preset parameter of the photovoltaic system, and then transmits the recorded waveform to an external device. The external device that performs relatively excellently in data storage and processing stores the waveform and performs subsequent processing, to accurately recognize the fault on the alternating current side of the inverter. Further, the fine waveform can be seen from the external device, so that the accuracy of system monitoring is greatly improved. Moreover, the external device analyzes the waveform and generates a control instruction to accurately control the inverter due to advantages of storage capacity, big data, and computing power. In addition, system performance can be optimized in cooperation with a local control unit.

Measuring instrument assembly (1) comprising a measuring instrument apparatus (2) for measuring electrical measurement variables, wherein the measuring instrument apparatus (2) comprises a measuring unit (4) comprising measuring electronics (3), and an output unit (5) comprising at least one output means (6), wherein an item of information generated from the measuring unit (4) and/or relating to the measuring unit (4) can be output via the output unit (5), wherein the output unit (5) can be or is detachably connected to the measuring unit (4).

Changes over time in a measured impedance are displayed in an easy to identify manner. A measurement result display apparatus includes a processor that executes a measurement result display process that displays measurement results on a display 5 based on measurement result data produced by encoding impedances that have been measured by a measurement apparatus. During the measurement result display process, the processor displays, on the display 5 and based on a plurality of measurement result data of impedances that satisfy a predetermined comparison condition and were produced by the measurement apparatus at different measurement times, a measurement result display screen 20 with measurement result displays 21a to 21d (graphs) in which the impedances for respective measurement result data are aligned in order of measurement time.

Changes over time in a measured impedance are displayed in an easy to identify manner. A measurement result display apparatus includes a processor that executes a measurement result display process that displays measurement results on a display 5 based on measurement result data produced by encoding impedances that have been measured by a measurement apparatus. During the measurement result display process, the processor displays, on the display 5 and based on a plurality of measurement result data of impedances that satisfy a predetermined comparison condition and were produced by the measurement apparatus at different measurement times, a measurement result display screen 20 with measurement result displays 21a to 21d (graphs) in which the impedances for respective measurement result data are aligned in order of measurement time.

The present disclosure provides a measurement application device comprising at least one signal acquisition interface configured to acquire an analog input signal and output a digital input signal, a first decimator for each signal acquisition interface, each one of the first decimators being configured to reduce the number of samples of the respective digital input signal and output a first decimated digital input signal, at least one second decimator for each signal acquisition interface, each one of the second decimators being configured to reduce the number of samples of the respective digital input signal and output a second decimated digital input signal, and at least one decoder for each one of the second decimators, each one of the decoders being configured to decode the respective second decimated digital input signal according to a respective protocol and provide a respective decoded input signal.

An amplifier includes a transconductance amplification module, a feedforward transconductance module, and a gain control module. An input control terminal pair of the transconductance amplification module is connected to an input signal pair, and the transconductance amplification module is configured to convert the input signal pair into an output current pair and output the output current pair. A first feedforward control terminal pair included in the feedforward transconductance module is connected to the input signal pair and outputs a feedforward current pair. The gain control module includes a first differential pair and a second differential pair. The first differential pair is configured to perform compensations for a positive-phase output current and a negative-phase output current of the output current pair respectively. The second differential pair is configured to perform compensations for the positive-phase output current and the negative-phase output current in the output current pair respectively.

An amplifier includes a transconductance amplification module, a feedforward transconductance module, and a gain control module. An input control terminal pair of the transconductance amplification module is connected to an input signal pair, and the transconductance amplification module is configured to convert the input signal pair into an output current pair and output the output current pair. A first feedforward control terminal pair included in the feedforward transconductance module is connected to the input signal pair and outputs a feedforward current pair. The gain control module includes a first differential pair and a second differential pair. The first differential pair is configured to perform compensations for a positive-phase output current and a negative-phase output current of the output current pair respectively. The second differential pair is configured to perform compensations for the positive-phase output current and the negative-phase output current in the output current pair respectively.