The 2011-FS-M Optical Receiver features a low-noise InGaAs detector, variable-gain trans impedance amplifiers, and two adjustable filters. It offers a wavelength range of 900 to 1700 nm and free space optical input. The DC÷30 setting prevents your signal from going off-scale due to DC amplitude fluctuations, without attenuating fast signals. The high-pass filter can be adjusted to eliminate residual 60 Hz noise, and the independent low-pass filter can be set to dampen noisy signals. Variable gain of up to 90 dB in 10-dB steps gives you a useful input range from 1 pW to 10 mW. M4 mounting thread.