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SR550 - FET Input Preamplifier

SR550 Preamplifier

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
SR550 specifications


SR550 Front Panel

Front Panel

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.

The preamplifier minimizes noise and pickup in the connecting lines and reduces measurement time in noise-limited experiments. When used with the 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).
SR550 Rear Panel

Rear Panel

Noise v Frequency

SR550 Specifications

 
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