Capacitance standards and decades provide highly accurate standard capacitance values for testing, comparing, and calibrating electrical and electronic components and products. Standards usually consist of a single, fixed value component or several components not in the same circuit. Decades (decade boxes, decade substituters) usually consist of several components (e.g., resistors) within the same circuit. Standards that provide continuous variability often incorporate a potentiometer. Standards that have more than one component (e.g., several fixed value resistors) have multiple posts or a rotary switch to select different resistance values. With decades, the standard resistance value is selected by varying the number of resistors in the series or parallel circuit.
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