Stanford Research Systems SR554 Overview
The Stanford Research SR554 is a low-noise, transformer-coupled preamplifier optimized for source impedances between 0.05 and 1 k. With an input noise of only 0.1 nV/Hz, the SR554 can be used in a wide range of low-noise applications. It is the ideal preamplifier for low-temperature synchronous detection applications where isolation between the experimental sample and the lock-in amplifier is critical. The SR554 can operate in one of two modes. In the
