SR445A型350 MHz前置放大器包含四个宽带宽, DC耦合的放大器，每个都有增益共5个。这四个通道可以独立使用，也可以级联使用，以提供最高的总增益到625。SR445A的快速上升时间、低噪声和出色的DC精度使其成为放大快速光电倍增管和光电二极管输出的理想仪器。SR445A可用于提高示波器、光子计数器、boxcar平均器、频谱分析仪等的灵敏度高频率的测试设备。
每个通道的输入和输出阻抗均为50ω。通道1的输入阻抗可通过a提高至约500ω前面板开关。这可以提高来自电流和电荷输出设备(如光电倍增管)的信号的灵敏度。每个通道都有单独的失调调整，允许您快速消除DC误差。
SR445A Specifications | |
General | |
| Amplifier channels | 4 |
| Inputs and outputs | 50 Ω (DC coupled) |
| Bandwidth | DC to 350 MHz (-3 dB) |
| Rise/fall time | 1 ns (single channel) |
| Voltage gain | 5 per channel (up to 4 channels can be cascaded) |
| Input noise | 6.4 nV/√Hz |
| Operating range | Inputs: ±200 mV Outputs: ±1.0 V |
| Propagation delay | 2.7 ns per channel |
| Recovery time | 3 ns for a 10× overload |
| Input protection | ±50 V for <1 ms |
| Output clamp | ±1.6 V |
| Output overload detect | ±1.3 V |
| Crosstalk | -60 dB |
| Operating temperature | 0 °C to 40 °C, non-condensing |
| Dimensions | 8.3″ × 1.5″ × 8.0″ (WHL) |
| Power | 10 W, 100/120/220/240 VAC, 50/60 Hz |
| Warranty | One year parts and labor on defects in materials and workmanship |
