The development of an inexpensive, portable, versatile, microprocessor based data acquisition system
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An inexpensive, portable, versatile, microprocessor based data acquisition system is presented. The design and development of the system hardware and software is described. The system is software intensive consisting of 2 Kbytes of monitor program and 1 Kbyte of application programs. It is configured to operate on a Z-80 microprocessor running at 2 MHz. It is programmed using a microcomputer through a serial port to meet specific requirements of data to be acquired which include calibrating specific input devices. A maximum of 16 analog signals in the range ojO-5 Volts can be simultaneously monitored by this system. Data is logged in the system in two modes. In the normal mode it acquires data at a maximum rate of 1 reading in 2 microseconds. Whereas in the interrupt mode with the real.time dock it takes 1 reading in 10 milliseconds. The main board storage capacity is 5 Kbytes but it has an additional capacity of 40 Kbytes 8H the RAM expansion card.