Stanford Research System SR554 Transformer input preamplifier

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Stanford Research System SR554 Transformer input preamplifier


Transformer input preamplifier (SRS SR554)

The Stanford Research SR554 is a low-noise, transformer-coupled preamplifier optimized for source impedances between 0.05 Ω and 1 kΩ. With an input noise of only 0.1 nV/√Hz, the SR554 can be used in a wide range of low-noise applications. It is the ideal preamplifier for low-temperature synchronous detection applications where isolation between the experimental sample and the lock-in amplifier is critical.

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The SR554 can operate in one of two modes. In the "bypassed" mode, the instrument is simply a passive transformer with a turns ratio of 100, providing an overall voltage gain of 100. In the "non-bypassed" mode, an additional amplifier with a gain of 5 is added increasing the gain to 500 and providing a low-impedance (<1 Ω) output. In the bypassed mode, the SR554 requires no external power. When using the output amplifier, 20 VDC must be supplied. The preamplifier connector on SRS lock-ins can be used to power the SR554.

SRS SR554 Features

  • 0.1 nV/√Hz input noise
  • 0.1 Hz to 40 kHz bandwidth
  • Transformer-coupled input
  • Gain of 100 or 500
  • Single-ended and differential inputs
  • >40 dB isolation (DC to 500 MHz)
  • Powered by SRS lock-ins

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