Lock-in Amplifiers

Lock-in Amplifiers

Lock- In Amplifiers:  Finding Your Way through the Noise

A lock-in amplifier is an instrument which allows the extraction of a signal from a known carrier wave in an extremely noisy environment.   This instrument has another capacity, namely, providing a high resolution measurements of relatively clear signals over several degrees of magnitude and frequency, facilitating solutions to a variety of measurement problems, in different scientific disciplines.

Serving  in wide range of applications,  Signal Recovery (AMETEK) lock-in amplifier is capable of measuring the in-phase quadrature components, vector magnitude, phase angle and noise of the input signal. It may be particularly effective and useful in recording studios.  Additionally, AMETEK’s lock-in amplifier offers the following functions:

  • Virtual reference: Under certain conditions, this mode allows measurement even in the absence of a reference signal
  • Dual reference: This mode allows making simultaneous measurement on two different reference frequencies.
  • Spectral display: Allows calculation and display of the spectrum signals present at the input.  Thus, it is of assistance in choosing the reference frequency.
  • Transient recorder: This mode allows the ADC input as a transient recorder, displayed graphically.
  • Frequency response: Allows the internal oscillator frequency to be swept between preset frequencies, while measuring the input signal magnitude and phase.  This mode is ideal for determining the frequency and phase response of external networks.  
  • Harmonic analysis: This lock-in amplifier, by SIGNAL RECOVERY, may operate on a large number of levels, as well as in dual harmonic mode, namely, simultaneous measurements on two harmonics.

Plus, its versatility facilitates both measurement and experiments, and therefore allows optimal accuracy in measurement.

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