Stanford Research SR560

The Stanford Research SR560 is a highly sophisticated, low-noise preamplifier, meticulously designed for precision applications across diverse fields such as low-temperature measurements, optical detection, and audio engineering. Blending versatility with high performance, the SR560 is your go-to instrument for demanding signal processing tasks.

Outstanding Features

• Advanced Noise Reduction: Equipped with a differential front end, the SR560 boasts an exceptional 4 nV/√Hz input noise, delivering superior performance for low-level signal detection.
• Flexible Input Configuration: With an input impedance of 100 MΩ, it supports both AC and DC coupled inputs, along with single-ended or differential configurations, making it adaptable for various experimental setups.
• TTL Blanking Input: The rear-panel TTL blanking input allows for seamless gain operation control, preventing front-end overloads by swiftly enabling and disabling gain.
• Versatile Gain Settings: Gains can be selected in a range from 1 to 50,000, following a 1-2-5 sequence. Additionally, the adjustable gain feature permits precise customization in 0.5% increments for enhanced signal optimization.

Configurable Filters

Incorporating two first-order RC filters, the SR560 allows for configuration of cutoff frequency and type (HPF or LPF) directly from the front panel. Users can set filters for either a 6 or 12 dB/oct rolloff low-pass or high-pass, or establish a band-pass configuration. A convenient filter reset button is included to minimize overload recovery times when managing long filter time constants.

Power Options and Battery Life

Powered by three internal rechargeable lead-acid batteries, the SR560 enables up to 15 hours of operation without being tethered to a power outlet. An integrated battery charger optimally adjusts the charging rate based on battery conditions, while LED indicators provide real-time battery status feedback.

Microprocessor-Controlled Precision

To ensure fidelity and minimize interference, the SR560's microprocessor remains inactive during signal processing, activating only during setup changes. This innovative approach prevents digital noise from contaminating sensitive analog signals.

Specifications

Input

• Input Types: AC or DC coupled, single-ended or differential
• Input Impedance: 100 MΩ + 25 pF
• Maximum Input: 3 Vpp
• CMRR: 100 dB from DC to 1 kHz (with common mode input of 100 mVrms at 1 kHz)
• Noise: 4 nV/√Hz at 1 kHz
• Gain: Adjustable from 1 to 50,000 in a 1-2-5 sequence, with a stability of 200 ppm/°C
• Bandwidth: -3 dB at 1.2 MHz (typ.)
• Flatness: ±0.3 dB to 300 kHz (for gains up to 1000)

Filters

• Filters: Two configurable (low-pass or high-pass), each with 6 dB/oct rolloff and selectable cutoffs in a 1-3-10 sequence from 0.03 Hz to 1 MHz.
• Gain Allocation Options:
  • High Dynamic Reserve: Gain applied post-filters to prevent overloads.
  • Low Noise: Gain applied pre-filters to enhance noise figures.

Output

• Maximum Output: 10 Vpp into both 50 Ω and 600 Ω loads.
• Filter Reset: Easily reset long time constant filters via a front-panel button.
• DC Drift: 5 µV/°C referred to input (DC coupled).
• Distortion: 0.01% at 1 kHz.
• Power Supply Outputs: Rear panel provides ±12 VDC @ 200 mA referenced to amplifier ground.