Additional Features: 5 fA/√Hz input noise 1 MHz maximum bandwidth 1 pA/V maximum gain Adjustable bias voltage Two configurable signal filters Variable input offset current Line or battery operation RS-232 interface The SR570 is a low-noise current preamplifier capable of current gains as large as 1 pA/V.High gain and bandwidth,low noise, and many convenient features make the SR570 ideal for a variety of photonic, low-temperature and other measurements.