美国Stanford Research低噪音电流放大器SR570,SR570低噪音电流放大器
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SR570是一款电流增益可达1 pA/V的低噪声电流前置放大器。高增益、宽带宽和许多优点使SR570 成为光子多样性测量和低温测量的理想工具。
增益 SR570具有1pA/V到1mA/V范围的灵敏度设置， 并可以以1;5的顺序进行选择。它同时具有游标 增益调节器，你可以选择灵敏度范围内的任意值。 为优化设备的性能，增益可以设定在放大器的不同级别。低噪声模式将增益放在了放大器的前端来使噪声性能达到*好。在它后面的是宽带宽模式增益，这样可以提高放大器前端的频率响应。在低漂移模式，输入放大器由一个输入电流非常低的放大器所代替，这样减小了设备1000倍的DC漂移。 滤波器 SR570有两个上等RC滤波器，它们的截至频率和类型都可通过前面板进行设置。它们可设定成6或12dB/oct的滚转下低通滤波器或高通滤波器，也可设定成6或12dB/oct的滚转下带通滤波器。截至频率可以以1＆#8722;3＆#8722;10的顺序从0.03Hz到1MHz进行调整。当使用长滤波时间常数时，滤波器的重设按钮可以用来缩短设备的过载恢复时间。 输入偏差和 DC 偏置 输入电流偏差调节器能抑制任何不想要的DC背景电流。偏差电流可以以0.1 %的增量从±1pA定义到±1mA。SR570还有可调节的输入DC偏置电压(±5 V)，允许你直接将电流降到有效零值（模拟接地）或可选的DC偏置。
The SR570 is a low-noise current preamplifier capable of current gains as large as 1 pA/V. High gain and bandwidth, low noise, and many convenient features make the SR570 ideal for a variety of photonic, low temperature and other measurements. SR570 Current Preamplifier
SR570 Current Preamplifier
The SR570 is a low-noise current preamplifier capable of current gains as large as 1 pA/V. High gain and bandwidth, low noise, and many convenient features make the SR570 ideal for a variety of photonic, low temperature and other measurements.
Gain The SR570 has sensitivity settings from 1 pA/V to 1 mA/V that can be selected in a 1-2-5 sequence. A vernier gain adjustment is also provided that lets you select any sensitivity in between.
Gain can be allocated to various stages of the amplifier to optimize the instruments performance. The low noise mode places gain in the front end of the amplifier for the best noise performance. The high bandwidth mode allocates gain to the later stages of the amplifier to improve the frequency response of the front end. In the low drift mode, the input amplifier is replaced with a very low input-current op amp, reducing the instrument’s DC drift by up to a factor 1000.
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