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QB306型六位电子计数频率计是上海邮电器材二厂的产品之一.主要用以测量信号的频率并附带作为10~(-6)精度级的频率标准.此外仪器还可当作累加计数器使用,如果配备适宜的附加设备后,更可用来测量时间间隔、周期以及转速等与时间有关的物理量. 仪器为二具可携式机箱结构(其中一具为电源),机箱内包括10个插入式单元部件和61个电子管,面板上设有6
QB306 six digital counting frequency meter is one of the products of Shanghai Posts and Telecommunications Equipment Factory No. 2. It is mainly used to measure the frequency of the signal with the frequency standard of 10 ~ (-6) accuracy level. In addition, the instrument can also be used as a cumulative counter , If equipped with the appropriate additional equipment, but also can be used to measure the time interval, cycle and speed and other time-related physical quantity.The instrument is two portable chassis structure (including a power supply), the chassis includes 10 plug-in Unit components and 61 tubes, panel with 6