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随着数据通信扩展到了千兆赫频段,相应地提出了在这一频率范围内进行载波处理数据测试的要求。Systron-Doroner公司的6054A自动频率计数器可以满足这一需要。6054A不仅是自动的,覆盖范围从0.02～18千兆赫,而且不需范围选择。20兆赫以上的全部输入信号用一只连接头,不用量程开关,也勿需更换电缆。 6054A的心脏部分是一只频率锁定的自动计算置换振荡器(PLACTO),因此这就能采用二种不同的微波计数技术。第一种为狭带工作,可以对类似微波合成器、倍频晶体源或其它高稳定锁相源等一类稳定频率源进行高速、高分辨力测试(分辨力达1周,速
As data communications extend to the gigahertz band, the need for carrier-processing data testing in this frequency range has been proposed accordingly. Systron-Doroner company's 6054A automatic frequency counter to meet this need. The 6054A is not only automatic, covering a range of 0.02 to 18 GHz, but also eliminates the need for range selection. All input signals above 20 MHz are connected with one connector without the need for range switches and without the need to change cables. The heart of the 6054A is a Frequency Locked Automatic Computed Permutation Oscillator (PLACTO) so that it can use two different microwave counting techniques. The first is a tape-based operation that enables high-speed, high-resolution testing of a stable frequency source such as a microwave synthesizer, frequency doubling crystal source, or other high-stability phase-locked sources (resolution up to 1 week,