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Stanford Research Systems / SRS SR570

Stanford Research (SRS) SR570 - Low Noise Current Preamplifier capable of current gains as large as 1 pA/V.
  • Stanford Research Systems / SRS SR570 for sale
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$1950.00 Sorry, Out of Stock

Model: Stanford Research Systems / SRS SR570     Condition: Reconditioned

The SR570 is a low-noise current preamplifier capable of current gains as large as 1 pA/V. High gain and bandwidth, low noise, and many convenient features make the SR570 ideal for a variety of photonic, low temperature and other measurements.

  • 5 fA/ãHz input noise
  • 1 MHz maximum bandwidth
  • 1 pA/V maximum gain
  • Adjustable bias voltage
  • Two configurable signal filters
  • Variable input offset current
  • Line or battery operation
  • RS-232 interface

SR570 Current Preamplifier



The SR570 has sensitivity settings from 1 pA/V to 1 mA/V that can be selected in a 1-2-5 sequence. A vernier gain adjustment is also provided that lets you select any sensitivity in between.

Gain can be allocated to various stages of the amplifier to optimize the instruments performance. The low noise mode places gain in the front end of the amplifier for the best noise performance. The high bandwidth mode allocates gain to the later stages of the amplifier to improve the frequency response of the front end. In the low drift mode, the input amplifier is replaced with a very low input-current op amp, reducing the instrumentfs DC drift by up to a factor 1000.


Block Diagram


The SR570 contains two first-order RC filters whose cutoff frequency and type can be configured from the front panel. Together, the filters can be configured as a 6 or 12 dB/oct rolloff low-pass or high-pass filter, or as a 6 dB/oct rolloff band-pass filter. Cutoff frequencies are adjustable from 0.03 Hz to 1 MHz in a 1-3-10 sequence. A filter reset button is included to shorten the overload recovery time of the instrument when long filter time constants are used.

Input Offset and DC Bias

An input offset-current adjustment is provided to suppress any undesired DC background currents. Offset currents can be specified from }1 pA to }1 mA in roughly 0.1 % increments. The SR570 also has an adjustable input DC bias voltage (}5 V) that allows you to directly sink current into a virtual null (analog ground) or a selected DC bias.

SR570 Current Noise vs. Frequency

Toggle and Blanking

Two rear-panel, opto-isolated TTL inputs provide additional control of the SR570. A blanking input lets you quickly turn off/on the instrument's gain which is useful in preventing front-end overloading. A toggle input inverts the sign of the gain in response to a TTL signal allowing you to perform synchronous detection with a chopped signal.


Battery Operation

Three rechargeable lead-acid batteries provide up to 15 hours of battery-powered operation. An internal battery charger 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.


SR570 Bandwidth


AccuSource Electronics is always happy to consider reasonable offers on our test instruments. Please enter your offer below for consideration.

Stanford Research Systems / SRS SR570

$ .00

Contact Info


Our normal service includes 90 day warranty, all standard accessories and manuals, and restoration to "nearly new" condition. Discounts may be offered for reduced service levels. Please let us know which of these you would be willing to consider for the price discount.

Reduced Warranty Period:
Do you require manuals and accessories for the instrument?
Will you accept an instrument with minor cosmetic and physical flaws if it operates properly?

Are you willing to prepay your order by check or wire transfer to avoid credit card fees?

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