Lock-in detection is a widely used measurement technique to detect small signals buried in noise. In this seminar, I will start with a refresher on the technique and discuss the most critical measurement parameters, such as modulation frequency and low-pass filter settings, and their effect on the measurement performance. We will then compare lock-in detection with boxcar averaging for pulsed signals and finally dive into more advanced measurement techniques, such as tandem and direct sideband demodulation. The second part of the seminar will be an interactive demonstration of how to set up a lock-in or boxcar measurement and optimize the measurement parameters for various requirements.