Multifunction I/o Boards for the Ibm Pc At
نویسندگان
چکیده
In this paper two low-cost PC-AT compatible boards, specially developed for completely automate the measuring procedure of a SEIKEN DTC-158 Resonant Column Apparatus and a SEIKEN DTC-199 Cyclic Triaxial Torcional Apparatus for cohesive and non-cohesive soils are described. One of the boards performs the measuring functions that include the measurement of voltages, frequencies and phase difference of periodic signals. The other board generates the signals that control the apparatus. These signals are three DC and one sinusoidal voltage signals. One of the DC outputs is used to generate a sinusoidal voltage constructed by software (step by step). The time measurements are not made by software after analog to digital conversion since with this method the required accuracy is not achieved (0.1Hz for frequencies up to 300Hz).
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