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Software for Digital Acquisition System and Application to Environmental MonitoringCriteria for selection of a minicomputer for use as a core resident acquisition system were developed for the ODU Mobile Air Pollution Laboratory. A comprehensive data acquisition program named MONARCH was instituted in a DEC-8/E-8K 12-bit computer. Up to 32 analog voltage inputs are scanned sequentially, converted to BCD, and then to actual numbers. As many as 16 external devices (valves or any other two-state device) are controlled independently. MONARCH is written as a foreground-background program, controlled by an external clock which interrupts once per minute. Transducer voltages are averaged over user specified time intervals and, upon completion of any desired time sequence, outputted are: day, hour, minute, second; state of external valves; average value of each analogue voltage (E Format); as well as standard deviations of these values. Output is compatible with any serially addressed media.
Document ID
19760017662
Acquisition Source
Ames Research Center
Document Type
Contractor Report (CR)
Authors
Copeland, G. E. (Old Dominion Univ. Norfolk, VA, United States)
Date Acquired
September 3, 2013
Publication Date
November 1, 1975
Subject Category
Environment Pollution
Report/Patent Number
NASA-CR-147986
PGS-TR-AP-75-15
Accession Number
76N24750
Funding Number(s)
CONTRACT_GRANT: NGL-47-003-067
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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