SRS SR552 BJT Input Preamplifier
- 1.4 nV/√Hz input noise
- BJT input, 100 MΩ input impedance
- Gain of 10, 20, 50 or 100
- Single-ended and differential inputs
- AC coupled input
- Powered by SRS lock-in amplifiers
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The Stanford Research Systems SR552 Voltage Preamplifier is designed to work with SRS lock-in amplifiers, providing gain where it is needed most—right at the experiment. The preamplifier minimises noise and pickup in the connecting ines and can reduce measurement time in noise-limited experiments.
The SRS SR552 differs from the SR550 in its bipolar front-end design. The SR552 has a lower input noise and a correspondingly lower input impedance (100 kΩ vs. 100 MΩ) than the SR550. When used with the SR510 or SR530, the preamplifier gain is automatically set by the lock-in. When used with the SR850, SR810 or SR830, the gain is always set to 100. Power and control signals are brought from the lock-in by a 9-pin cable (included). The SR552 may also be operated independently by applying appropriate power supply voltages (±20 VDC, +5 VDC).
| Input impedance | 100 MΩ + 25 pF |
| Inputs | Single-ended or differential |
| Maximum input | 70 mVrms for overload 50 VDC, 20 VAC damage threshold |
| Noise (typ.) | 1.4 nV/√Hz at 1 kHz |
| 1.6 nV/√Hz at 100 Hz | |
| 2.5 nV/√/Hz at 10 Hz | |
| Coupling | AC (0.016 Hz) |
| CMRR (1V input) | 100 dB at 100 Hz |
| Gain | 10, 20, 50, 100 (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 | 200 ppm/°C |
| Outputs | A (signal, 600 Ω, single-ended) |
| B (shielded ground) | |
| Maximum output | 10 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 SR552 datasheet 
