The SR555 is a low-noise, high-bandwidth, fixed-gain current (trans-impedance) amplifier designed to work with SRS lockin amplifiers. Current amplifiers provide gain close to the experimental detector, allowing the user to minimize input cable length and its corresponding input capacitance. The SR555 minimizes noise and pickup before they permanently degrade the signal-to-noise ratio, reducing measurement time in noise-limited experiments.SR555 Current Preamplifier 10 V/�A fixed gain 120 kHz bandwidth Bias voltage input Powered by SRS lock-in amplifiersFeatures Specifications SR555 Current Preamplifier The SR555 is a low-noise, high-bandwidth, fixed-gain current (trans-impedance) amplifier designed to work with SRS lockin amplifiers. Current amplifiers provide gain close to the experimental detector, allowing the user to minimize input cable length and its corresponding input capacitance. The SR555 minimizes noise and pickup before they permanently degrade the signal-to-noise ratio, reducing measurement time in noise-limited experiments. Power is brought from the lock-in by a 9-pin cable. The SR555 can also be operated independently by applying the appropriate DC power. Phone: (408)744-9040 ? Fax: (408)744-9049 ? email: info@thinkSRS.com ? www.thinkSRS.com SR555 FET PreamplifierSR555 FET Preamplifier GeneralGeneral Gain 107 V/A Bandwidth 120 kHz (-3 dB) Input noise (typ.) 42 fA/�Hz at 1 kHz Current inputCurrent input Impedance 50 � Bias current DC bias inputDC bias input Range �5 VDC Settling time Impedance 1 M� Gain accuracy 1 % Gain stability �50 ppm/�C Output 20 Vpp max. balanced differential 10 mA max., 50 � Power Supplied by SR510, SR530, SR810, SR830 or SR850 or SR124 via connector cable Dimensions 3.0" ? 1.3" ? 5.1" (WHL) Weight 10 oz. Warranty One year parts and labor on defects in materials and workmanship Phone: (408)744-9040 ? Fax: (408)744-9049 ? email: info@thinkSRS.com ? www.thinkSRS.com Phone: (408)744-9040 ? Fax: (408)744-9049 ? email: info@thinkSRS.com ? www.thinkSRS.com