The R&S ESR3 EMI Test Receiver is an advanced dual-function instrument designed for precision measurement of electromagnetic disturbances. In addition to its role as an EMI test receiver, it operates as a fully equipped signal and spectrum analyzer, making it perfect for comprehensive lab applications. The ESR3 features rapid measurement capabilities, employing an FFT-based time domain scan, and offers in-depth analysis and history of disturbance signals through real-time spectrum analysis, supported by an array of diagnostic tools. Its robust yet compact design, coupled with a user-friendly interface and intuitive touchscreen display, ensures ease of use and mobility in various testing environments.