Transcription of www.thinkSRS.com About Lock-In Amplifiers
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www.thinkSRS.com About Lock-In Amplifiers
About Lock-In AmplifiersApplication Note # Research Systemsphone: (408) Amplifiers are used to detect and measure very smallAC signals all the way down to a few nanovolts. Accuratemeasurements may be made even when the small signal isobscured by noise sources many thousands of times Amplifiers use a technique known as phase-sensitivedetection to single out the component of the signal at aspecific reference frequency and phase. noise signals, atfrequencies other than the reference frequency, are rejectedand do not affect the Use a Lock-In ? Let's consider an example. Suppose the signal is a 10 nV sinewave at 10 kHz.
specific reference frequency and phase. Noise signals, at frequencies other than the reference frequency, are rejected and do not affect the measurement. Why Use a Lock-In? Let's consider an example. Suppose the signal is a 10 nV sine wave at 10 kHz. Clearly some amplification is required to bring the signal above the noise. A good low-noise ...
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