Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984asmd.conf..175p&link_type=abstract
In NASA. Goddard Space Flight Center Astron. Microdensitometry Conf. p 175-187 (SEE N84-28020 18-35)
Astronomy and Astrophysics
Astronomy
Astronomical Observatories, Digital Techniques, Interfaces, Microdensitometers, Photometers, Data Storage, Microprocessors, Photomultiplier Tubes
Scientific paper
An intelligent subsystem for interfacing a PDS1010A digital microdensitometer to a DEC DR11W DMA 16 bit UNIBUS port in DEC VAX VMS environment was tested. The subsystem employs two MOTOROLA M68000 microprocessors with 128 KB data memory. The PDS primitives and the user defined high level scanning functions and preprocessing modules are loaded from the host computer into two 8 KB RAM memories in the microprocessors using a dedicated PDS control language. The subsystem is planned to employ a nonstandard photomultiplier electronics. Two design schemes were tested: (1) based on three amplifiers of gain 10 cascaded and multiplexed to a 12 bit AD converter, and (2) based on a single amplifier of gain 100 and two 14 bit AD converters.
Pucillo Mauro
Sedmak Giorgio
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