Stanford Research
Stanford Research SR550
Voltage PreAmplifier
50 Ω Input Impedance
DC to 100 MHz Frequency Range
25 dB (fixed) Voltage Gain
6 dB typical at 50 Ω source impedance Noise Figure
±2 V DC + AC peak Maximum Input Voltage

| Attribute | Value |
|---|---|
| Input Impedance | 50 Ω |
| Frequency Range | DC to 100 MHz |
| Voltage Gain | 25 dB (fixed) |
| Noise Figure | 6 dB typical at 50 Ω source impedance |
| Maximum Input Voltage | ±2 V DC + AC peak |
| Output Impedance | 50 Ω |
| Power Supply | ±15 VDC, provided via BNC power connector |
| Connectors | BNC input and BNC output |
| Operating Temperature | 0°C to 40°C |
| Dimensions | 1.25 in × 3.25 in × 0.75 in (W × L × H) |
| Model | SR550 |
|---|
The 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.




