A lock-in amplifier takes signals from very noisy environments to measure the amplitude and phase components. They provide clean signals over different magnitudes and frequencies, and also provide DC output proportional to the AC signal.
Lock-in amplifiers are used in situations where small amplitude AC signals are to be analyzed. These signals are at the nanovolt level or lower, a situation where noise can cause a problem. As an alternate to using a low noise amplifier (LNA) with a band pass filter, the lock-in amplifier uses a phase-sensitive detector (PSD). The PSD provides a useful function of detecting a signal at a certain frequency with a bandwidth as low as 0.01Hz. A reference frequency is set and the signal being measured is compared to the ideal reference, resulting in a DC signal output proportional to the input AC waveform.
This instrument is used in industries like scientific research, optics, electrochemistry, materials science, fundamental physics and electrical engineering, as units which can provide the optimum solution to a large range of measurement problems.
Advanced Test Equipment Rentals (ATEC) carries equipment from several manufacturers, providing solutions to best suit your test and measurement needs.