Low-Noise Voltage Preamplifier - Department of Physics
https://www.physics.wisc.edu/courses/home/spring2020/407/407_Lab_Instrument_Manuals/SR560-low-noise_amplifier-filter/SR560-low-noise_amplifier-specs.pdf
WEBThe SR560 is a high-performance, low-noise preamplifier that is ideal for a wide range of applications including low temperature measurements, optical detection, and audio engineering. Inputs. The SR560 has a differential front-end with 4 nV/√Hz input noise and an input impedance of 100 MΩ.
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