Lock In Amplifier Block Diagram

Ultra fast data acquisition snapshot mode up to 500 ms s continuous mode up to 1 ms s.

Lock in amplifier block diagram.

A lock in amplifier also known as a phase sensitive detector is a type of amplifier that can extract a signal with a known carrier from an extremely noisy environment it is basically an analog multiplier followed by a low pass filter practically a lock in amplifier convert the high frequency signal into a dc component or at a very low frequency. Block diagram while a lock in amplifier is an extremely important and powerful measuring tool it is also quite simple. Specs moku lab spec sheet. The sr844 includes the many features ease of operation and programmability that you ve come to expect from srs dsp lock in amplifiers.

Voltage controlled oscillator vco. The lock in consists of five stages. Filter roll off 6 12 18 or 32 db octave. A lock in amplifier is a type of amplifier that can extract a signal with a known carrier wave from an extremely noisy environment.

Input impedance 50 ω 1 mω. Lock in amplifiers were invented in the 1930 s 1 2 3 and commercialized in the mid 20th century as electrical instruments capable of extracting signal amplitudes and phases in extremely noisy environments see figure 1 they employ a homodyne detection scheme and low pass filtering to measure a signal s amplitude and phase relative to a periodic reference. The block diagram of a lock in amplifier is shown in figure 1. It provides uncompromised performance with a frequency range of 25 khz to 200 mhz and up to 80 db of drift free dynamic reserve.

The sr844 is the widest bandwidth lock in amplifier available. Intuitive user interface block diagram view of the digital signal processing chain. Depending on the dynamic reserve of the instrument signals up to 1 million times smaller than noise components potentially fairly close by in frequency can still be reliably detected.