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DSR-04 is a high-precision 8-channel serial FFT signal analyzer module that is part of the Ninigi system. The module features a compact, lightweight design and a powerful FPGA processor for digital signal real-time processing. It is equipped with an 8-channel input for signal analysis and a 3-channel differential analog output for monitoring, system control and logging. Its flexible software programming interface and wide dynamic range make it suitable for various applications from industrial to scientific research. The key features of the DSR-04 include high speed data acquisition, real-time data display, multi-parameter signal analysis, signal math, customizable instrument control, and Ethernet network connection. The module also supports a wide range of interfaces including Ethernet, USB, CAN, and RS-485, as well as third-party hardware integration.