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HOME Test and Measurement Generators Noise Sources Stanford Research Systems SR554

Stanford Research Systems SR554

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Description of Stanford Research Systems SR554

Categories: Generators, Noise Sources

Manufacturer: Stanford Research Systems

Model: SR554

Condition: Used

Seller: TICS International Ltd

Stanford Research System SR554 Transformer input preamplifier 0.1 nV/?Hz input...

In stock
Condition: Used
Stanford Research System SR554 Transformer input preamplifier


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


The Stanford Research SR554 is a low-noise, transformer-coupled preamplifier optimized for source impedances between 0.05 ? and 1 k?. 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.

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 (< ?) 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.

Product specifications of Stanford Research Systems SR554 (From Used-Line T&M Specifications)

  • Launch Date Jan-2049
  • See also SR550
  • Status --

The SR554 is a low-noise, transformer-coupled preamplifier optimized for source impedances between 0.05 W and 1 kW. With an input noise of only 0.1 nV/ÖHz, 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. 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 W) 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.

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