Sensitivity=the change of output (measured value)
per unit of input (measurand). Sensitivity is the slope of
the static calibration curve at a given value of the input.
Resolution=the smallest increment of change
in the measured value that can be determined
from the readout or recording instrument
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Sensitivity is the smallest unit of a given parameter that can be meaningfully detected
with the instrument when used under reasonable conditions.
For example, assume the sensitivity of a DMM in the volts function is 100 nV.
With this sensitivity, the DMM can detect a 100 nV change in the input voltage.
For a noise-free DMM, resolution is the smallest change in an input signal that produces,
on average, a change in the output signal. Resolution can be expressed in terms of bits,
digits, or absolute units, which can be related to each other.
I suggest to read these for more info....
Digital Multimeter Measurement Fundamentals
http://zone.ni.com/devzone/cda/tut/p/id/3295
**broken link removed**
Section 1 / page 10
Example (pressure sensor):
Resolution defines the ability to distinguish one reading from another.
For a digital pressure gauge the resolution is normally referred to as the number of readable digits,
e.g. 2 bar range with a 5 digit display would have a 0.1 mbar resolution.
A strain gauge pressure sensor without any amplification is described as having a signal output with infinite resolution,
since there is no signal conditioning to limit it.
Accuracy refers to the worse case error in measuring a particular reading compared to the actual value.
If the resolution is of a similar value to the accuracy it should be included in the accuracy statement,
since the true uncertainty of reading should also encompass readability.
The folllowing are examples of how resolution and accuracy are described in specifications of pressure measuring equipment:
Digital Pressure Gauge
Pressure Range: 200 bar
Accuracy: 0.05% Full Scale = 100 mbar
Display Resolution: 5 digits = 10 mbar
Amplified Pressure Transducer (0-10Vdc out)
Pressure Range: 200 bar
Accuracy: 0.25% Full Scale = 500 mbar/25mV
Digital to Analog Amplifier Resolution: 0.002% Full Span = 4 mbar/0.2mV