A general purpose computer-based data acquisition system and temperature controller

Abstract

<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">The design and operational details of a general purpose computer based data acquisition system (DAS) and temperature controller are given. The DAS consists of a 12-bit analog to digital converter (25 µs convertion time), two 12-bit digital to analog converters having fast settling time (500 ns), control circuit and Thermocouple Signal Conditioner (2B50). The software which is user friendly menu driven has been developed in Turbo-Basic. The data acquired is stored in the hard disk and can also be displayed on the monitor. The algorithms for data acquisition and temperature control are presented. The temperature in the range 77-400 K can be controlled with an accuracy of ± 0.1 K. Because of its simplicity and versatality, the system is best suited for upgrading the existing instruments like NMR spectrometers, EPR spectrometer, etc. where data acquisition and temperature control are involved.</span>