Reflow Profiling Leadfree SMT Assembly
Preheat Ramp Rate. Max (+) Slope °C/s. Ambient to peak 4min 40s (280s) °C/s x 280s = °C increase from ambient to peak. 25°C (ambient) + °C = °C peak. True ramp rate or slope is from ambient to peak (RTP profile) Ramp rate considerations for soak profile. Ramp rate = ΔTemp/ Δtime. 214°C/280s = °C/s.