For example: Agilent E4440A or Anritsu 68369
Lock-In Amplifier
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Stanford Research Systems SR510 Overview
The Stanford Research SR510 Lock-In Amplifier detects and measures very small AC signals in the presence of much larger, obscuring noise. Input voltages from 100 nV to 500 mV or currents from 100 fA to 1 uA at frequencies to 100 kHz can be accepted. A 10 volt analog output permits high level control from very small voltage or current inputs.
The SR510 features large dynamic range, high CMRR, and true differential inputs. An analog panel meters and LCD display monitors the input channel. RS232 interface is standard, IEEE-488 is available optionally.