Pharmocopoeia S/N is a calculation that, when enabled, overwrites the S/N calculation from ICIS peak detection settings. The Pharmacopoeia S/N calculation uses a peak-to-peak method for calculating the S/N. It also denotes a set of pharmacopoeia guidelines to be followed by the pharmaceutical companies. For more information, refer to Usp 621 Chromatography chapter - "USP 35".