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350 MHz Preamplifier SR445A -- 350 MHz preamplifier (4-channel) The Model SR445A 350 MHz Preamplifier contains four Each channel has an input and output impedance of 50 . wide-bandwidth, DC-coupled amplifiers, each with a gain The input impedance of channel one can be increased to of 5. The four channels may be used independently, or approximately 500 by a front-panel switch. This can cascaded to provide a total gain of up to 625. The fast rise improve the sensitivity of signals from current and charge time, low noise, and excellent DC accuracy of the SR445A output devices, such as photomultiplier tubes. Each channel make it an ideal instrument for amplifying the outputs of fast has a separate offset adjustment allowing you to quickly null photomultiplier tubes and photodiodes. The SR445A can DC errors. be used to improve the sensitivity of oscilloscopes, photon counters, boxcar averagers, spectrum analyzers, and other high-frequency test equipment. SR445A Specifications Amplifier channels 4