Features:
- Transformer-coupled input
- 0.1 nV/√Hz input noise
- 0.1Hz to 40 kHz 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
The SR554 is a low-noise, transformer-coupled preamplifier optimized for source impedances between 0.05 Ohm and 1 kOhm. 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 (gain of 5) is added, increasing the overall gain to 500 and providing a low-impedance (<1 Ohm) 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.
| Manufacturer | Stanford Research |
|---|---|
| Condition | Used |