A.2. ADC and the Autoranging Voltmeter
Very often in measuring circuit characteristics, it is necessary to plot some voltage response over a wide range of input-voltage stimulation. An automatic means of adjusting the voltmeter sensitivity through the sweep is thus required. When set for the full measurement range (limit), the 12-bit analog-to-digital conversion (ADC) in the DAQ has either a 2.44 mV (unipolar, 10 V full range) or a 4.88 mV (bipolar, 20 V full range) resolution.
However, the range of the DAQ is software selectable. So, for example, suppose that in the sweep we are measuring 5 mV and only positive voltages. The DAQ can be programmed for a high limit of, for example, 100 mV and a low limit of 0 V (unipolar), such that the resolution ...
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