Signal amplifier 410

opticaldifferentialDC

Scitec Instruments Model 410 is a single phase analogue lock-in amplifier. It is suitable for making amplitude and phase measurements. • Single phase instrument • Differential or single-ended input • Gain settings from 3 µV to 1 V • High performance wide bandwidth input gain stage • Analogue meter for display of output signals • Output offset controls • Output time constants from 100 µs to 30 s • 1F and 2F reference signal operation • 90° step and fine phase control Lock-in amplifiers are used to measure the amplitude and phase of small AC signals in the presence of much larger noise levels. They are widely used to recover small optical signals such as those encountered in spectroscopy and studies of fluorescence and luminescence. However, they also have applications in many other fields including electronics and cryogenics where they can be used in component characterisation, bridge networks and to measure the resistance of superconductors. The output from a lock-in amplifier is a DC voltage proportional to the amplitude of the input signal but with the noise removed. It is also a function of the relative phase difference between the input signal and the associated reference signal. This property allows lock-in amplifiers to be used for measuring the phase properties of the input signal as well.