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Stanford SR810 and SR830 DSP Lock-in Amplifiers

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Stanford SR810 and SR830 DSP Lock-in Amplifiers

Stanford Research Systems

The SR810 Lock-In Amplifier and SR830 Lock-In Amplifier provide high performance at a reasonable cost. The SR830 simultaneously displays the magnitude and phase of a signal, while the SR810 displays magnitude only. Both instruments use digital signal processing (DSP) to replace the demodulators, output filters and amplifiers found in conventional lock-ins. The SR810 and SR830 provide uncompromised performance with an operating range of 1mHz to 102kHz and 100dB of drift-free dynamic reserve.


  • 1mHz to 102.4kHz frequency range
  • >100dB dynamic reserve
  • 5ppm/°C stability
  • Time constants from 10µs to 30ks (up to 24 dB/oct roll off)
  • Auto-gain, -phase, -reserve and -offset
  • Synthesised reference source
  • GPIB and RS232 interfaces

The SR810 and SR830 Lock-In Amplifiers have differential inputs with 6 nV/√Hz  input noise The input impedance is 10MΩ, and minimum full-scale input voltage sensitivity is 2nV. The input can also be configured for current measurements with selectable current gains of 106 and 108 V/A. A line filter (50Hz or 60Hz) and a 2x line filter (100Hz or 120Hz) are provided to eliminate line related interference. However, unlike conventional lock-in amplifiers, no tracking bandpass filter is needed at the input. This filter is used by conventional lock-ins to increase dynamic reserve. Unfortunately bandpass filters also introduce noise, amplitude and phase error, and drift. The DSP based design of these lock-ins has such inherently large dynamic reserve that no tracking bandpass filter is needed.

For further information please contact us or download the datasheet.


SR810 and SR830 datasheet                              Read more on Stanford's website