Strategies
for proving & production
test/calibration
Compensation
schemes – hardware
& software
Very few sensors are
capable of
operating across a range of environment without changing calibration as
a result. Traditionally devices have been compensated by means of the
analogue interface electronics, perhaps by inclusion of a thermistor
for temperature trimming. Indeed devices were sometimes provided with a
look-up table or graph to enable manual calibration. Ironically the
look-up table approach has been brought up to date as one of the
techniques used in digital software compensation. The use of a
microcontroller can also enable more sophisticated mathematical
modelling and curve fitting to be employed often as a result of
secondary sensor measurements. It can sometimes be beneficial to remove
less sophisticated analogue compensation from a commercial device, so
that a digital solution can be applied more effectively.
