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A multi-channel beat-frequency digital measurement system (BFDMS) using digital signal processing method has been developed and operated in NTSC. The system can high-precision analyze and monitor high-stability frequency sources. It consists of three independent measuring channels what can be operated simultaneously and one calibrating channel to correct the systematic error. This result that the...
The performance of two high precision frequency-stability measurement systems, analog beat method time-interval analyzer, has been compared with digital beat method systems developed at the National Time Service Center. In this paper, the digital beat method system is a measuring technique that uses a multi-channel beat note digital analyzer in place of the time interval counter. This technique uses...
The heterodyne method is one of main methods in high precision frequency measurement. In the traditional heterodyne method, the counter is used to measure the square wave of beat signal. This method is inconvenient to the multichannel measurement and real-time display of measurement results. In this paper, based on the technique of virtual instruments, the traditional heterodyne method is improved...
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