Using Fast Automated Scan/SIM Type (FASST), scan data and SIM data are acquired at almost the same time by fast, alternate switching between scan mode and SIM mode. Highly sensitive SIM data of FASST is useful in case traditional scan data is insufficient in sensitivity, and scan data of FASST catches the unknown compounds which are overlooked in traditional SIM mode.

FASST (Fast Automated Scan/SIM Mode)