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 ?
with one or more stages of RC filters. In a digital lock-in, such as the SR830 or SR850, the signal and reference are represented by sequences of numbers. Multiplication and filtering are performed mathematically by a digital signal processing (DSP) chip. We’ll discuss this in more detail later. Narrow Band Detection
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