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Preamplifier
SR550 FET input preamplifier

SR550 ... from $750
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SR550 FET Preamplifier

Front Panel

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SR550 FET Preamplifier

Rear Panel

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  • 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
  • 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.
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    SR550 FET Preamplifier

    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 any SRS lock-in, 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).

    Noise vs. frequency

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    SR550 FET Preamplifier

    Noise vs. Frequency

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