AN AUTONOMOUS PROGRAMMABLE SYSTEM FOR MOSSBAUER-SPECTROSCOPY, ACCESSED BY A PC PROGRAM

A low cost, stand alone microprocessed equipment for data acquisition and driver control, designed under the requirements of Mossbauer spect roscopy is described. It has a functional mode as pulse analyzer (PHA) and a second mode as a multichannel analyzer (MCA) while it generates waveforms-triangular, sawtooth and sinusoidal-between 2 and 40 Hz, bu ffered up to a capacity of 750 mA for velocity transducer (DRIVER) man agement, with PID signal synthesizer and error minimization circuits. Its resolution is variable, between 2 and 1024 channels. The system ha s CMOS technology of integration, Z-80-74HC, with a 4.9152 MHz crystal time based; its dead time is of 0.61 mu s and its minimum dwell time is of 32 mu s. Data are continuously kept in memory and can be transfe rred, under a managing program request, via RS-232c protocol at 9600 B AUD -to a PC computer for its analysis and display. The program writte n for a PC is able to distinguish up to 8 different spectrometers by m eans of an identity number assigned to each unit. Therefore, the seria l input may be multiplexed in order to attend all the systems, that ca n work simultaneously.