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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最好。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有两个一级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
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
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.
Filters
The SR570 contains two first-order RC filters whose cutoff frequency and type can be configured from the front panel. Together, the filters can be configured as a 6 or 12 dB/oct rolloff low-pass or high-pass filter, or as a 6 dB/oct rolloff band-pass filter. Cutoff frequencies are adjustable from 0.03 Hz to 1 MHz in a 1-3-10 sequence. A filter reset button is included to shorten the overload recovery time of the instrument when long filter time constants are used.
An input offset-current adjustment is provided to suppress any undesired DC background currents. Offset currents can be specified from ±1 pA to ±1 mA in roughly 0.1 % increments. The SR570 also has an adjustable input DC bias voltage (±5 V) that allows you to directly sink current into a virtual null (analog ground) or a selected DC bias.
Toggle and Blanking
Two rear-panel, opto-isolated TTL inputs provide additional control of the SR570. A blanking input lets you quickly turn off/on the instrument's gain which is useful in preventing front-end overloading. A toggle input inverts the sign of the gain in response to a TTL signal allowing you to perform synchronous detection with a chopped signal.
Battery Operation
Three rechargeable lead-acid batteries provide up to 15 hours of battery-powered operation. An internal battery charger automatically charges the batteries when the unit is connected to the line. The charger senses the battery state and adjusts the charging rate accordingly. Two rear-panel LEDs indicate the charge state of the batteries. When the batteries become discharged they are automatically disconnected from the amplifier circuit to avoid battery damage.
No Digital Noise
The microprocessor that runs the SR570 is "asleep" except during the brief interval it takes to change the instrument's setup. This ensures that no digital noise will contaminate low-level analog signals.
RS-232 Interface
The RS-232 interface allows listen-only communication with the SR570 at 9600 baud. All functions of the instrument (except power on) can be set via the RS-232 interface. The RS-232 interface electronics are opto-isolated from the amplifier circuitry to provide maximum noise immunity.
SR570 Current Preamplifier
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.
Input Offset and DC Bias
SR570 Current Noise vs. Frequency
SR570 Bandwidth
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