The SR552 Voltage Preamplifier, manufactured by Stanford Research Systems, and is intended to work with SRS lock-in amplifiers, which adds gain of 10,20, 50 or 100 where it is required most right at the experiment..sr552电压的前置放大器由斯坦福研究系统的生产并打算与SRS相放大器的工作增加了增益10,2050或100它是最在实..Power and control signals are brought from the lock-in by a 9-pin cable that is included on the package.电源和控制信号从定的9电缆包括在包。