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 SR554 - Transformer Preamplifier |
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 Front Panel |
The 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. 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. |
 Rear Panel |
 Noise Figure Contour |
 Amplitude Response vs. Source Resistance and Frequency |
SR554 Specifications
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| 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) |
| <1 Ω (Transformer and buffer) | |
| 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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