Which EMC (electromagnetic compatibility) devices are helpful for the design and modification of body fat analyzers?

The core of EMC design for body fat scales lies in the generation and detection of measurement signals. The oscillator generating a 50kHz sine wave needs to be frequency-stable and have a clean waveform; a DDS chip or crystal oscillator with filtering can be used. The power amplifier and current sensing circuit for the driving electrodes should be symmetrical and low-noise. The leads of the four electrodes should be of equal length and symmetrically arranged on the PCB to reduce common-mode interference. The entire analog measurement area should be physically isolated from the digital control section, with separate ground lines connected via a single point. Since the device typically uses batteries or low-power switching power supplies, appropriate decoupling is necessary. Static electricity may be introduced when the user stands; ESD protection should be considered at the electrode connections.