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Freebase(0.00 / 0 votes)Rate this definition: OSIsoft. OSIsoft, LLC is a worldwide manufacturer of Application software for real-time data infrastructure solutions, called the PI System. Founded in 1980, OSIsoft, LLC is privately held and headquartered in San Leandro, CA, with operations worldwide.
VALERIE C. COFFEY, contributing editor. An optical spectrum analyzer (OSA) is a wavelength-selective optical power meter that measures signal power versus wavelength (or frequency), tunable over a specified wavelength range somewhere between the ultraviolet and the infrared, depending on the application.