Allowing the user full freedom to use its four channels independently or cascaded for enhanced total gain of up to 625, the Model SR445A 350 MHz Preamplifier is set of four DC-coupled amplifiers, equipped with a gain of five each. The main features of the SR445A amplifier are its fast rise time, low noise and excellent DC accuracy. Its advantages make it the perfect choice for amplifying the outputs of fast photomultiplier tubes and photodiodes.允使用四独立或级增强625的总增益用户充分的由模型sr445a 350兆的前置放大器组四直流合放大器具有增益五每。sr445a放大器的主特点是上升时快低噪和好的直流精度。它的优点是放大的快光电倍增管和光电二极管的出的理想择。