Printed Circuit Board (PCB) is information carriers integrating various electronic components. It is also the key unit of electronic products.

印制电路板(PCB)是集成各种电子元器件的信息载体，是电子产品的关键部件。

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Since A/D and D/A converters are the key components in seismic instruments, their circuit designs and printed circuit board (PCB) layout have a near relation with the feature of the instrument.

转换器、D／A转换器是地震仪器的核心部件，其电路和印刷板的布置及设计直接影响到仪器的精度和指标。

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