SRS SR550 FET Input Preamplifier
- 3.6 nV/√Hz input noise
- FET input, 100 MΩ input impedance
- Gain of 1, 2, 5 or 10
- Single-ended and differential inputs
- AC coupled input
- Powered by SRS lock-in amplifiers
- High common mode rejection
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The Stanford Research Systems SR550 Voltage Preamplifier is designed to work with any SRS lock-in amplifier. Preamplifiers provide gain close to the experimental detector, before the signal-to-noise ratio is permanently degraded by cable capacitance and pickup.
The preamplifier minimises noise and pickup in the connecting lines and reduces measurement time in noise-limited experiments. When used with the SRS SR510 or SR530, the preamplifier gain is automatically chosen to optimize noise performance without compromising dynamic reserve. When used with the SR810, SR830 or SR850, the preamplifier gain is automatically set to its maximum value. Power and control signals are brought from the lock-in by a 9-pin cable (included). The SR550 may also be operated independently from the lock-ins by applying appropriate biasing (±20 VDC, +5 VDC).
| Input impedance | 100 MΩ + 25 pF |
| Inputs | Single-ended or differential |
| Maximum input | 250 mVrms for overload 100 VDC, 10 VAC damage thres |
| Noise (typ.) | 3.6 nV/√Hz at 1 kHz |
| 4.0 nV/√Hz at 100 Hz | |
| 13 nV/√/Hz at 10 Hz | |
| Coupling | AC (0.016 Hz |
| CMRR | 90 dB at 100 Hz, 1 V input |
| Gain | 1, 2, 5, 10 (automatically set by SR510 or SR530 lock-in amplifier) |
| Full scale input | 10 nV to 200 mV |
| Gain accuracy | 2 % (2 Hz to 100 kHz) |
| Gain stability | 100 ppm/°C |
| Outputs | A (signal, 600 Ω, single-ended) |
| B (shielded ground) | |
| Maximum output | 7 Vpp |
| Power | Supplied by SR510, SR530, SR810, SR830 or SR850 via connector cable |
| Dimensions | 3.0" × 1.3" × 5.1" (WHL) |
| Weight | 1 lbs. |
| Warranty | One year parts and labor on defects in materials and workmanship |
Stanford Research Systems SR550 datasheet | Photo | Product | SKU | |
|---|---|---|---|
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