Re: Resolution and Sensitivity - What is measurment instrument or gage 'Sensitivity'?
Sorry, but I would disagree with answer
Resolution and sensitivity are somewhat similar concepts, but they apply in different circumstances.
Sensitivity is relevant when measurements are made in units other than the quantity being measured; for example, a pressure sensor will have a sensitivity of X microVolts per mmHg (e.g.), a photodetector will have a sensitivity of Y microvolts per millilumen, etc... Sensitivity is the local slope of the input (e.g. mmHg) vs output (e.g. uV) curve, at that input value (for a linear sensor, that slope is independent on the input value).
Resolution is indeed the smallest increment in input which generates, on average, a measurable output (ie a change in output).
Now, when your gauge (or measurement instrument) measures directly in "final units", then sensitivity and resolution are basically the same thing (and usually, the term resolution is used). In the other case, usually, the term sensitivity is used (because the resolution depends on the circuitry/display etc. behind the sensor, and so is not relevant).
So for example, the strain gauge sensor inside a scale will be described in terms of sensitivity (uV/milligram, e.g.). But the scale itself will be described in terms of resolution (e.g. 1 milligram).
A thermocouple will have a sensitivity (uV/C), but a thermometer will have a resolution (e.g. 0.05C).
So, typically, a sensor will have a sensitivity, but an instrument will have a resolution.