2 MHz Lock-In Amplifier SR865 — 2 MHz dual phase lock-in amplifier SR865 2 MHz Lock-In Amplifier Superb performance. Outstanding value. They’re what you’ve come to expect from a Stanford Research Systems lock-in amplifier. And they’re delivered by the new SR865 2 MHz Lockin Amplifier, the latest in a line of innovative lock-ins from SRS. With unparalleled analog performance, sophisticated new digital signal processing features, a thoroughly modern, intuitive user interface, and a wide range of computer connectivity options, the SR865 is the ideal choice for any synchronous detection application. · 1 mHz to 2 MHz frequency range (operates to 2.5 MHz) · Low-noise current and voltage inputs · Touchscreen data display - large numeric results, chart recordings, & FFT displays With over 30 years of lock-in design experience SRS has made every effort to optimize each detail of the SR865. From a hefty toroidal transformer that eliminates switch-mode noise to iOS connectivity that brings the lock-in to your cell phone to advanced DSP filters that eliminate more noise while speeding up your experiment, the SR865 is truly the ultimate lock-in amplifier. · HDMI video output Signal Inputs · 10 MHz timebase input and output · Dual reference mode Lock-in performance starts at the front end. The SR865 front end offers both state-of-the art voltage and current input amplifiers. The voltage input is a switchable single-ended/ differential JFET-pair amplifier with 2.5 nV/√Hz of noise at 1 kHz and under 10 nV/√Hz of noise at 10 Hz. The voltage input has a 10 MΩ input impedance and can be AC or DC coupled. Input connector shields can be connected to the instrument ground through a user selectable 10 Ω (Ground) or 10 kΩ (Float) resistor. Stanford Research Systems

Output Time Constants and Filtering SRS current source and several SRS preamplifiers The SR865’s built-in current amplifier represents a significant improvement over previous designs. The current input range is selectable from 1 μA or 10 nA. The 1 μA range has 400 kHz of bandwidth and 130 fA/√Hz of noise, while the 10 nA range offers 2 kHz of bandwidth and 13 fA/√Hz of noise. While the built in voltage and current amplifiers are suitable for most applications, the SR865 is also compatible with the complete range of specialized pre-amplifiers offered by SRS. The SR550 (FET input), SR552 (BJT input),...

to the sine output. A rear-panel logic-level sync signal synchronized to the sine output is also provided. Rear-panel 10 MHz inputs and outputs are provided allowing the SR865 to be locked to an external frequency reference (such as the FS725 10 MHz Rubidium Frequency Standard). Alternatively, the 10 MHz output from the SR865 can be used to synchronize several lock-ins or other test equipment with a It should be emphasized that as useful as the touchscreen display is for displaying data, it's not necessary to use the touchscreen to control common instrument functions on the SR865. All commonly...

SR865 Specifications Signal Channel Voltage inputs Single-ended or differential Sensitivity (output scale) 1 nV to 1 V (voltage input) 1 fA to 1 µA (current input) Voltage input range 10 mV to 1 V (peak) Current input range 1 µA or 10 nA (peak) Max input 1 V (peak) or 1 µA (peak) Input impedance Voltage input 10 MΩ + 25 pF, AC or DC coupled Current input 1 kΩ or 100 Ω to virtual ground Gain accuracy ±1 % (<200 kHz), ±2 % (to 2 MHz) Signal amplitude must be less than 30 % of input range Noise (rms) 2.5 nV/√Hz at 1 kHz (10 mV input range, typ.) Harmonic distortion –80 dB (<100 kHz), –60 dB (>100...

Inputs and Outputs CH1 output CH2 output X and Y outputs BlazeX Aux outputs Aux inputs Trigger input Signal monitor HDMI Timebase I/O Interfaces GPIB (IEEE-488.2), RS-232, USB and Ethernet USB flash Front-panel slot for USB flash storage of screen shots and data Preamp power 9-pin D connector to power SRS preamps Power 60 W, 100/120/220/240 VAC, 50/60 Hz Dimensions 17” × 5.25” × 17” (WHD) Weight 22 lbs. Warranty One year parts and labor on defects in materials and workmanship Proportional to X or R (±10 V full scale thru 50 Ω) Proportional to Y and θ (±10 V full scale thru 50 Ω) Proportional...