
EMC (Electromagnetic Compatibility) of gene sequencers represents the highest level of systems engineering. The CCD/CMOS camera for fluorescence imaging and its cooling unit require independent shielded enclosures and independent linear power supplies. The drive power supply for the laser excitation source must have extremely low noise. Temperature control of the microfluidic chip employs distributed multi-point sensors and a PID controller; sensor signals use differential transmission and are shielded. The drive lines for precision displacement platforms (e.g., piezoelectric ceramics or linear motors) use coaxial shielded cables. The entire system adopts a modular electromagnetic shielding design, with modules interconnected via fiber optic communication. The equipment room must be equipped with purified power supplies and a reliable grounding system.