# Stanford Research Systems SR560 Low-Noise Voltage Preamplifier (Pre-Owned) # Stanford Research Systems SR560 Low-Noise Voltage Preamplifier (Pre-Owned) ## Key Features At A Glance - Low-noise differential front-end: 4 nV/√Hz input noise at 1 kHz with 100 MΩ input impedance - Variable gain from 1 to 50,000 in a 1-2-5 sequence, with 0.5% vernier gain adjustment - DC to 1 MHz bandwidth; –3 dB at 1.2 MHz typical, ±0.3 dB flatness to 300 kHz (gains up to 1000) - Two configurable first-order RC filters: low-pass, high-pass, or band-pass; cutoffs 0.03 Hz to 1 MHz - AC- or DC-coupled, differential or single-ended inputs with fully floating BNC connections - Line or battery operation — three rechargeable lead-acid batteries provide up to 15 hours - RS-232 interface (9600 baud, receive-only) controls up to four units from one computer - Dual 600 Ω and 50 Ω outputs drive 10 Vpp; rear-panel ±12 VDC @ 200 mA bias supply The Stanford Research Systems SR560 is a high-performance, low-noise voltage preamplifier built around a differential front-end. It is designed to recover small voltage signals from the noise floor across a wide range of measurement work, offering selectable gain, configurable signal filtering, and the choice of line or battery operation in a single bench instrument. The SR560 is suited to a wide range of applications, including low-temperature measurements, optical detection, and audio engineering. Its combination of low input noise, broad gain range, and front-panel signal filtering lets an engineer condition a weak signal before it reaches the downstream instrument in any of these measurement contexts. ValueTronics stocks and holds its own inventory in a 20,000-square-foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. Every pre-owned unit is inspected and functionally verified in-house before it ships, while new units leave factory-sealed exactly as received from the manufacturer. ## Product Core & Specifications Specification Value 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) Filters Signal filters 2 configurable (low-pass or high-pass) 6 dB/oct rolloff filters. –3 dB points are settable in a 1-3-10 sequence from 0.03 Hz to 1 MHz. Gain allocation High Dynamic Reserve — Gain is increased after the signal filters to prevent overloading. Low Noise — Gain is increased before the filters to improve noise figure. Output Maximum output 10 Vpp into 50 Ω and 600 Ω Filter reset Long time constant filters may be reset with front-panel button. DC drift 5 µV/°C referred to input (DC coupled) Distortion 0.01 % at 1 kHz Rear panel ±12 VDC @ 200 mA referenced to amplifier ground General External gating TTL input sets gain to zero Interfaces RS-232, 9600 baud, receive only Power 100/120/220/240 VAC, 6 W charged, 30 W while charging. Internal batteries provide 15 hours of operation between charges. Batteries are charged while connected to the line. Dimensions 8.3" × 3.5" × 13.0" (WHD) Weight 15 lbs. (batteries installed) Warranty One year parts and labor on defects in materials and workmanship > **Important:** Maximum input: 3 Vpp. > Usage tip: the SR560 accepts the O560RMS single and O560RMD double rack-mount kits for rack installation, and the O560SB spare battery set (three batteries). ## About this Pre-Owned unit This pre-owned unit is inspected and functionally verified in-house before it ships and is backed by our pre-owned warranty. To confirm its exact condition, firmware revision, installed options, or included accessories for your application before ordering, contact our Test Architects. - Warranty included - Functional verification included - Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data. - Note that unnecessary accessories may not be included (contact Test Architect to confirm). ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application. **Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.** ## Details - **Price:** 3495.0 USD - 4230.0 USD - **Vendor:** Stanford Research Systems - **Type:** Pre Amp - **Tags:** Amplifier, Inc., Manufacturers, Model 560, Other Equipment, Pre-Owned, Preamplifier, product_manual_group_1, Product_used, SR560, SRS, Stanford Research, Stanford Research Systems, Updated Item Review ## Variants | Variant | Price | Available | |---------|-------|-----------| | None | 3495.00 USD | In stock | | NIST Traceable | 3845.00 USD | In stock | | NIST Traceable with Full Data | 4055.00 USD | In stock | | ISO IEC 17025 Accredited | 4230.00 USD | In stock | ## Images - Stanford Research Systems SR560 Low-Noise Voltage Preamplifier (Pre-Owned) --- > Source: [ValueTronics](https://valuetronics.com/products/sr560-stanford-research-preamplifier-used) > Updated: 2026-06-03