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23.9～24MH_z连续锁定振荡器是18.6MH_z电平振荡器和选频电平表中一个主要单元,简称f_2单元。由于采用锁相技术,因而具有频率稳定度高,使用方便等优点。一、概述一般的LC,RC振荡器其频率可在一定范围内连续调节,但是频率稳定度不高,一般批量生产时只能做到10~(-3)～10~(-4)量级。这样远远不能满足有线载波测量仪器的要求。晶体振荡器的频率稳定度较高,一般可做到10~(-6)量级,但频率调节范围小。为了得
23.9 ~ 24MH_z continuous lock oscillator is a 18.6MH_z level oscillator and frequency level meter in a major unit, referred to as f_2 unit. As a result of phase-locked technology, which has high frequency stability, ease of use and so on. First, an overview General LC, RC oscillator frequency can be continuously adjusted within a certain range, but the frequency stability is not high, the general mass production can only do 10 ~ (-3) ~ 10 ~ (-4) . This far can not meet the requirements of cable carrier measuring instruments. Crystal oscillator frequency stability is higher, generally can be done on the order of 10 ~ (-6), but the frequency adjustment range is small. In order to