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lock-in amplifier

   Also found in: Wikipedia 0.03 sec.
lock-in amplifier [′läk‚in ′am·plə‚fī·ər]
(electronics)
An amplifier that uses some form of automatic synchronization with an external reference signal to detect and measure very weak electromagnetic radiation at radio or optical wavelengths in the presence of very high noise levels.


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Either the phase or the dispersive in-phase output of the lock-in amplifier can be used in a feedback loop to lock the driving frequency to the Larmor frequency by stabilizing the phase shift to -90[degrees].
The Model 2182A brings a powerful new set of capabilities to researchers when used in conjunction with Keithley's recently introduced models 6220 DC current source and 6221 AC/DC current source; users now are able to make resistance measurements, pulsed I-V measurements, and differential conductance measurements faster and more accurately than previously possible, in many cases eliminating the need for an expensive lock-in amplifier or AC resistance bridge.
The PMD resolution of the system appears to be limited by the phase noise of the lock-in amplifier itself.
 
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