Resolution of a measuring instrument

In metrology, the resolution of a measuring instrument is the ability to detect the smallest change in the value of a physical property that an instrument can detect. It also represents a static characteristic of an instrument. The resolution of an instrument can also be defined as the minimum incremental value of the input signal that is required to cause a detectable change in the output. Resolution is also defined in terms of percentage as:

\[\textrm{Resolution}=\dfrac{\Delta I}{I_{max}-I_{min}}\times 100\]

The quotient between the measuring range and resolution is often expressed as a dynamic range and is defined as:

\[\textrm{Dynamic range}=\dfrac{\textrm{measurement range}}{\textrm{resolution}}\]

And is expressed in terms of dB. The dynamic range of an n-bit ADC comes out to be approximately \(6n\) dB.

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