SRS
SR550 – FET input preamplifier
Overview
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.
Feature
• 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
Technical Specifications
General
Input impedance: 100 M? + 25 pF
Inputs: Single-ended or differential
Maximum input: 250 mVrms for overload 100 VDC, 10 VAC damage threshold
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 ?, single-ended)
B (shielded ground)
Maximum output: 7 Vpp
Power: Supplied by SR510, SR530, SR810, SR830 or SR850 or SR124 via control cable
Dimensions: 3.0″” ? 1.3″” ? 5.1″” (WHL)
Weight: 1 lbs.
Warranty: One year parts and labor on defects in materials and workmanship
Others
N/A
