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\section{Voltage Measurement}  Although data can be considered in the analogue domain, it Electrical potential or voltage  is usually thought of digitally. In this way, measured in  a large portion wide range  of any DAQ system sensing applications, as it  is devoted to converting analogue signals to readily converted into  digital data in components called analogue signals for processing. This is undertaken through the use of Analogue  to digital converters Digital Converters  (ADCs). There are varied approaches to ADCs, and various types of ADC,  each have their of which has associated  benefits and flaws. drawbacks.  Flash ADCs use individual a sequence of  comparators and logic gates to produce facilitate an  extremely fast ADCs, however as conversion. Hhowever,  the number of output bits increases, bits,  the number of logic gates and comparators  needed increases rapidly exponentially  because one comparator is needed for each discrete  value. This means that Therefore  the cost implications  of flash  ADCswith more than 7bits  of resolution is prohibitive. >8bits are prohibitive for many applications.  Successive approximation ADCs use a comparator coupled with a digital-to-analogue converter to get a gradually more accurate digital value. Successive approximation ADCs take a different amount of time to arrive at a digital value depending upon how many successive steps are taken to reach the correct analogue value. These ADCs can be produced with much higher resolution, but at lower sample rates.