Home Preamplifiers SRS SR554 Transformer Preamplifier

SRS SR554 Transformer Preamplifier

Product Code:
14991
Manufacturer: Stanford Research Systems
  • Transformer-coupled input
  • 0.1 nV/√Hz input noise
  • 0.1 Hz to 40kHz bandwidth
  • Gain of 100 or 500
  • Single-ended and differential inputs
  • >40 dB isolation from DC to 500 MHz
  • Powered by SRS lock-in amplifiers

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The Stanford Research Systems SR554 is a low-noise, transformer-coupled preamplifier optimised for source impedances between 0.05 Ω and 1 kΩ. With an input noise of only 0.1 nV/√Hz, the SRS 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. 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.

Mode Single-ended or differential
Noise 0.1 nV/√Hz
Source impedance 0.05 Ω to 1 kΩ (recommended)
CMRR >120 dB below 1 kHz
Comman mode range Primary can float to ±100 VDC
Gain 100× (Transformer only)
  500× (Transformer and buffer)
Max frequency response (1V input) 0.1 Hz to 40 kHz
Isolation >40 dB, DC to 500 MHz
Output Single-ended or differential
Maximum output 100 Vpp (Transformer only)
  20 Vpp (Transformer and buffer)
Output impedance >5 kΩ (Transformer only)
   
Dimensions and weight 3.75" × 3.0" × 7.5" (WHL), 4 lbs.
Power Supplied by SRS lock-ins. Ext. ±20 VDC supplies can also power the SR554.
Warranty One year parts and labor on defects in materials and workmanship
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