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选用二手测量仪器的优势是：  

1、与新购仪器几个月的供货期相比，购买二手仪器的供货期要短的多。在 时间就是市场的今天，优势无疑是最为明显的。  

2、二手仪器的价格便宜，基本为新购仪器价格的20%～50%。在电子技术迅 速发展的今天，仪器的更新也在加快，投资越少则风险越小。  

3、为了让您放心地使用我们提供的二手仪器，我们销售的二手仪器可以做到： 

      1、保修半年至一年不等。 

      2、可以根据您的要求，将仪器送至国家级计量测试单位进行校准。

The Audio Precision SWR-2122U is an Unbalaned Switcher that features 12 x 2architecture . It provides a means of expanding the analog interface capacity of System One and System Two family audio analyzers with provisions for cascading up to 16 units, allowing up to 192 channels to be accessed. Switching is computer-controlled via the same APIB as the Cascade Plus. The SWR-2122U can be used as either an input or output switcher. Uses floating BNC connectors for unbalanced signals to prevent ground loops.

Key features of the AP SWR-2122 include:

* expansion of System capability up to 192 inputs and outputs
* Balanced (XLR) and Unbalanced (BNC) connector versions available
* Patch point version inserts test generator and analyzer at patch point
* Crosstalk <140 dB @ 20 kHz, balanced