Low-Noise Voltage Preamplifier SR560 — DC to 1 MHz voltage preamplifier SR560 Low-Noise Preamplifier · 1 MHz bandwidth The SR560 is a high-performance, low-noise preamplifier that is ideal for a wide range of applications including low temperature measurements, optical detection, and audio engineering. · Variable gain from 1 to 50,000 Inputs · AC or DC coupled The SR560 has a differential front-end with 4 nV/√Hz input noise and an input impedance of 100 MΩ. Complete noise figure contours are shown in the SR560 Tech Note at the end of this section. The SR560’s inputs are fully floating (BNC shields are not connected to chassis ground). Both the amplifier ground and the chassis ground are available on the rear panel for flexibility in grounding the instrument. Input offset nulling is accomplished by a front-panel potentiometer, accessible with a small screwdriver. · 4 nV/√Hz input noise · Two configurable signal filters · Differential and single-ended inputs · Line or battery operation · RS-232 interface In addition to the signal inputs, a rear-panel TTL blanking input lets you quickly turn off and on the instrument’s gain. This is useful in preventing front-end overloading. The gain turns off 5 µs after the TTL level goes high, and back on again within 10 µs after the TTL signal goes low. Outputs Two insulated output BNC connectors provide 600 Ω and 50 Ω outputs. Both are capable of driving 10 Vpp into their respective loads. Two rear-panel power supply outputs · SR560 ... $2395 (U.S. list) Stanford Research Systems phone: (408)744-9040 www.thinkSRS.com

SR560 Low-Noise Preamplifier provide up to 200 mA of ±12 VDC referenced to the amplifier ground. The outputs provide clean DC power for use as a bias source. 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. Gain Gain is selectable from 1 to 50,000 in a 1-2-5 sequence. An adjustable gain feature lets you...

SR560 Specifications Distortion 0.01 % at 1 kHz Rear panel ±12 VDC @ 200 mA referenced to amplifier ground Input Inputs 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 (100 mV common mode input at 1 kHz, gain of 100, low noise mode. Decreases by 6 dB/octave from 1 kHz to 1 MHz) Noise 4 nV/√Hz at 1 kHz Gain 1 to 50,000 in 1-2-5 sequence Vernier gain in 0.5 % steps Gain stability 200 ppm/°C Bandwidth –3 dB at 1.2 MHz (typ.) Flatness ±0.3 dB to 300 kHz (gains up to 1000) General External gating TTL input sets gain to...