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).
- 1.4 nV/√Hz input noise
- BJT input, 100 kΩ input impedance
- Gain of 10, 20, 50 or 100
- Single-ended and differential inputs
- AC coupled input
- Powered by SRS lock-in amplifiers