SRS SR556 Current Preamplifier
- 1 V/nA fixed gain
- 5 fA/√Hz input noise
- Bias voltage input
- Powered by SRS lock-in amplifiers
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The Stanford Research Systems (SRS) SR556 is an ultra-low noise, 1V/nA fixed-gain current (trans-impedance) amplifier designed to work with SRS lock-in amplifiers.
These current amplifiers are designed to be placed close to the experimental detector, providing gain close to the source and allowing the user to minimise input cable length and its corresponding input capacitance. The SR556 minimises noise and pickup before they permanently degrade the signal-to-noise ratio, reducing measurement time in noise-limited experiments.
This preamplifier takes its power from a Stanford Research lock-in amplifier like the SR865 or SR830, via a 9-pin cable. The SR556 can also be operated independently by applying the appropriate DC power.
| General | |
| Gain | 109 V/A |
| Bandwidth | 3 kHz (–3 dB) |
| Input noise (typ.) |
5 fA/√Hz at 1 kHz |
| Current input & | |
| Impedance | <50Ω |
| Bias current | <3 pA |
| DC bias input | |
| Range | ±5 VDC |
| Settling time | <250 ms |
| Impedance | 1 MΩ |
| Gain accuracy | 1 % |
| Gain stability | ±50 ppm/°C |
| Output | 20 Vpp max. balanced differential 10 mA max., 50Ω |
| Power | Supplied by SR510, SR530, SR810, SR830, SR850 or SR124 via control cable |
| Mechanical | 3.0" × 1.3" × 5.1" (WHD) |
| Weight | 10 oz. |
| Warranty | One year parts and labor on defects in materials and workmanship |
Stanford Research Systems SR556 datasheet 
