# Stanford Research Systems SR570 Low-Noise Current Preamplifier (Pre-Owned) # Stanford Research Systems SR570 Low-Noise Current Preamplifier (Pre-Owned) ## Key Features At A Glance - Sensitivity from 1 pA/V to 1 mA/V in a 1-2-5 sequence with 0.5% vernier adjustment - Selectable Low Noise, High Bandwidth, and Low Drift gain-allocation modes - Flat frequency response within ±0.5 dB to 1 MHz with front-panel source-capacitance compensation - Adjustable input DC bias voltage (±5 V) and ±1 pA to ±1 mA input offset-current suppression - Two configurable low-pass/high-pass 6 dB/oct filters, −3 dB points from 0.03 Hz to 1 MHz - RS-232 interface (9600 baud, receive-only) sets all functions except power-on for automation - Up to 15 hours of battery operation from three rechargeable lead-acid cells with internal charger - Opto-isolated TTL blanking and toggle inputs for overload prevention and synchronous detection The SR570 is a low-noise current preamplifier that converts a small input current into a proportional output voltage. Rather than terminating a current source into a resistor and amplifying the resulting voltage, it amplifies the current directly, which preserves amplitude and phase accuracy in the presence of stray cable capacitance and lets the source operate into a virtual null instead of a large bias voltage. Because it can sink current directly into a virtual null or a selected DC bias, the SR570 suits measurements from current sources and detectors that cannot tolerate a large termination voltage. A rear-panel opto-isolated toggle input inverts the sign of the gain in response to a TTL signal, supporting synchronous detection with a chopped signal, while a blanking input quickly turns the gain off and on to prevent front-end overloading. ValueTronics supports every SR570 order from our own 20,000-square-foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois, where we stock and hold our own inventory. Every used unit is inspected and functionally verified in-house before it ships, while new units ship factory-sealed exactly as received from the manufacturer. ## Product Core & Specifications Specification Value Input Inputs Virtual null or user-set bias (±5 V) Input offset ±1 pA to ±1 mA adjustable DC offset current Maximum input ±5 mA Noise See graphs on previous page Sensitivity 1 pA/V to 1 mA/V in 1−2−5 sequence (Vernier adjustment in 0.5 % steps) Frequency response ±0.5 dB to 1 MHz (Adjustable front-panel frequency response compensation for source capacitance) Grounding Amplifier ground is fully floating. Amplifier and chassis ground are available at rear panel. Input ground can float up to ±40 V. 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 — Low Noise Gain is allocated to the front end for best noise performance. Gain allocation — High Bandwidth Front-end gain is reduced for optimum frequency response. Gain allocation — Low Drift Low bias current amplifier is used for reduced drift at high sensitivity. Filter reset Long time constant filters may be reset with front-panel button. Output Gain accuracy ±(0.5 % of output + 10 mV) @ 25 °C DC drift See Sensitivity / Bandwidth / Noise table below Maximum output ±5 V into a high impedance load General External blanking TTL input sets gain to zero External toggle TTL input inverts gain polarity Rear panel biasing ±12 VDC @ 200 mA, referenced to amplifier ground Computer interface 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 Sensitivity (A/V) Bandwidth\* — High BW Bandwidth\* — Low Noise Noise (/√Hz)\*\* — High BW Noise (/√Hz)\*\* — Low Noise Temp. coefficient ±(% input + offset)/°C — Low Drift (11 to 28 °C), All Modes DC Input Impedance 10⁻³ 1.0 MHz 1.0 MHz 150 pA 150 pA 0.01 % + 20 nA 1 Ω 10⁻⁴ 1.0 MHz 500 kHz 100 pA 60 pA 0.01 % + 2 nA 1 Ω 10⁻⁵ 800 kHz 200 kHz 60 pA 2 pA 0.01 % + 200 pA 100 Ω 10⁻⁶ 200 kHz 20 kHz 2 pA 600 fA 0.01 % + 20 pA 100 Ω 10⁻⁷ 20 kHz 2 kHz 600 fA 100 fA 0.01 % + 2 pA 10 kΩ 10⁻⁸ 2 kHz 200 Hz 100 fA 60 fA 0.01 % + 400 fA 10 kΩ 10⁻⁹ 200 Hz 15 Hz 60 fA 10 fA 0.025 % + 40 fA 1 MΩ 10⁻¹⁰ 100 Hz 10 Hz 10 fA 5 fA 0.025 % + 20 fA 1 MΩ 10⁻¹¹ 20 Hz 10 Hz 5 fA 5 fA 0.040 % + 20 fA 1 MΩ 10⁻¹² 10 Hz 10 Hz 5 fA 5 fA 0.040 % + 20 fA 1 MΩ \* Frequency compensation adjusted for flat frequency response. \*\* Average noise in the frequency range below the 3 dB point but above the frequency where 1/f noise is significant. > **Important:** Maximum input current: ±5 mA. Amplifier ground is fully floating; input ground can float up to ±40 V. ## 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:** 0.0 USD - **Vendor:** Stanford Research Systems - **Type:** Pre Amp - **Tags:** Amplifier, Inc., Manufacturers, Model 570, Other Equipment, Pre-Owned, Preamplifier, product_manual_group_1, Product_used, SR570, SRS, Stanford Research, Stanford Research Systems ## Variants | Variant | Price | Available | |---------|-------|-----------| | None | 0.00 USD | In stock | | NIST Traceable | 0.00 USD | In stock | | NIST Traceable with Full Data | 0.00 USD | In stock | | ISO IEC 17025 Accredited | 0.00 USD | In stock | ## Images - SR570 Stanford Research Preamplifier --- > Source: [ValueTronics](https://valuetronics.com/products/sr570-stanford-research-preamplifier-used) > Updated: 2026-06-03