Spirometer PCB

A 2-layer PCB built on S1000H FR-4 laminate, 1.6±0.16mm thick, with a minimum drilled hole of φ0.40mm. The board carries the analog front-end and microcontroller circuitry that drives a spirometer — the diagnostic instrument used to measure inhaled and exhaled air volume and flow during pulmonary function tests. Layout is tuned for low-noise sensor signal conditioning, stable reference voltages, and short return paths around the flow-rate transducer and pressure sensor lines, so readings stay accurate across the full breathing cycle. The S1000H substrate offers good dielectric stability and through-life solder-joint reliability, important for handheld and clinical instruments that see repeated cleaning and transport. Typical end-uses are bedside spirometers, portable lung-function screening devices, sleep apnea diagnostic kits, and respiratory training instruments used by clinicians and home-care patients.