SR860 Lock-In Amplifier with 1 mHz to 500 kHz Frequency Range, RS-232 Interfaces, and Touchscreen Data Display by SRS Stanford Research Systems
The new SR860 Lock-in Amplifier from SRS Stanford Research Systems represents the latest innovation in lock-in amplifiers. With unparalleled analog performance, sophisticated digital signal processing features, an intuitive modern user interface, and comprehensive computer connectivity options, the SR860 is the ideal choice for any synchronous detection application.
- 1 mHz to 500 kHz frequency range
- Touchscreen data display
- 1 µs to 30 ks time constants
- Low noise voltage & current inputs
- High bandwidth outputs
- HDMI video output
- 10 MHz timebase input & output
- GPIB, RS-232, Ethernet & USB connectivity
Lock-in performance starts at the front end. The SR860 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.
The SR860's built-in current amplifier represents a significant improvement over previous designs. The current input range is selectable from 1μA or 10 nA. The 1μA 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.
The SR860 is compatible with the complete range of specialized pre-amplifiers offered by SRS, including the SR550 (FET input), SR552 (BJT input), SR554 (transformer input), SR555 (120 kHz current amp), and SR556 (low-noise current amp).
The SR860 comes standard with comprehensive remote interfaces including GPIB (IEEE488.2), RS-232, USB (Test and Measurement Class), and Ethernet (VXI-11 and telnet). The instrument hosts its own web server for remote monitoring and control via browser. A front-panel USB port allows data and screenshots to be saved to USB flash drives in comma-delimited or MATLAB-compatible .MAT formats.
| Signal Channel | |
|---|---|
| Voltage inputs | Single-ended or differential |
| Sensitivity (output scale) | 1 nV to 1V (voltage input) 1 fA to 1µA (current input) |
| Voltage input range | 10mV to 1V (peak) |
| Current input range | 1µA or 10 nA (peak) |
| Max input | 1V (peak) or 1µA (peak) |
| Input impedance | |
| Voltage input | 10MΩ+25 pF, AC or DC coupled |
| Current input | 1 kΩ or 100Ω to virtual ground |
| Gain accuracy | ±1% (100 kHz) |
| 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 kHz) |
| CMRR | 90 dB to 1 kHz (DC coupled, 10 mV to 100 mV input range) |
| Dynamic reserve | 120 dB (typ) |
| Reference Channel | |
| Frequency range | 0.001Hz to 500 kHz |
| Timebase | 10MHz In/Out (phase locks the internal frequency to other SR860s) |
| Input impedance | 1MΩ or 50Ω |
| Phase setting resolution | 360/232 degrees |
| Phase noise | |
| Int. ref | <0.0001° rms at 1 kHz (100ms, 12 dB/oct) |
| Ext. ref (typ) | <0.001° rms at 1 kHz (100ms, 12 dB/oct) |
| Phase drift (typ) | <0.002°/°C below 20 kHz (DC coupled) |
| <0.02°/°C below 200 kHz | |
| <0.2°/°C below 2MHz | |
| Harmonic detection | Detect at N×f ref (N<99 and (N×f ref)<2MHz) |
| Dual F reference | Detect at f dual = |fint - fext| |
| Chopper reference | SR860 drives SR540 Chopper (via Aux Out 4) to lock the chopper to fint |
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