Which EMC (electromagnetic compatibility) devices are helpful for the design and modification of pulmonary function testing equipment?

The key to EMC design of a pulmonary function analyzer is isolating motor interference and protecting sensor signals. Twisted-pair or shielded cables should be used for the motor drive lines of air pumps or valves, and an RC snubber circuit or TVS diode (e.g., SMBJ series) should be connected in parallel at the driver output to suppress inductive spikes. For the signal conditioning circuits of flow and pressure sensors, decoupling capacitors should be placed near the power supply pins of the operational amplifiers. Small resistors and capacitors can be connected in series at the input pins to form a low-pass filter; alternatively, ESD protection devices with integrated EMI filters can be used. USB or serial ports for communication between the device and the PC should use ESD protection chips (e.g., ESDSR05) to prevent static electricity from entering the internal circuitry through the connection lines.