Stanford Research SR445 300 MHz Preamplifier
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Stanford Research SR445 300 MHz Preamplifier

This Stanford Research SR445 300 MHz Preamplifier is used and in excellent condition.

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Stock # 89504-1
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Stanford Research SR445 300 MHz Preamplifier

  • DC to 300 MHz Bandwidth
  • 1.2 ns Rise and Fall Time
  • (4) Independent Channels
  • 2.8 nV/öHz Input Noise
  • Voltage Gain to 125
  • 50 W Input and Output Impedance


The Stanford Research SR445 300 MHz Preamplifier contains four wide-bandwidth, DC-coupled amplifiers, each with a gain of 5. The four channels may be used independently, or up to three may be cascaded to provide a total gain of 125. The fast rise time, low noise and excellent DC accuracy of the SR445 make it an ideal instrument for amplifying the outputs of fast photomultiplier tubes and photodiodes. The SR445 can be used to improve the sensitivity of oscilloscopes, photon counters, boxcar averagers, spectrum analyzers and other high frequency test equipment.

Each channel has an input and output impedance of 50 W. The input impedance of channel 1 can be increased to approximately 500 W by a front-panel switch. This can improve the sensitivity of signals from current and charge output devices, such as photomultiplier tubes. Each channel has a separate offset adjustment allowing you to quickly null DC errors.

Product Family: SR445, SR-445

Important Notice: Please note that any additional items included with this equipment such as accessories, manuals, cables, calibration data, software, etc. are specifically listed in the above stock item description and/or displayed in the photos of the equipment. Please contact one of our Customer Support Specialists if you have any questions about what is included with this equipment or if you require any additional information.

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Stanford Research SR445 300 MHz PreamplifierStanford Research SR445 300 MHz PreamplifierStanford Research SR445 300 MHz Preamplifier
Stanford Research SR445 300 MHz Preamplifier

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