Chat Live
Contact Us
sales@valuetronics.com
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.
| 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.
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.
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.
Model No
Stanford
Condition
Pre-Owned
Manufacturer
Stanford Research Systems
Ampl_freq
1 MHz
30+ Years in Business
Secure Payments
Sell Test Equipments
Knowledgeable Staff
On-site Lab
30+ Years in Business
Secure Payments
Sell Test Equipments
Knowledgeable Staff
On-site Lab
Request A Quote
