1. SYSTEMATIC ERRORS
For a value given of the
mesurande, a systematic error is been constant, is to slow variation as compared
to the duration of measure: it introduces therefore a constant gap between true
value and measure value. Systematic errors have generally to causes an incomplete
knowledge or wrong of the installation of measure or its bad utilization.
1.1 Errors on the value of a magnitude of reference
This type of error can
be reduced by the nursed verification of equipment associated
1.2 Errors on the characteristic of the sensor
Error on the sensitivity
or on the curve of calibrate. A recalibrate frequent of all sensor used
in severe conditions of job allows to reduce, without nevertheless cancelling
it, this type of error.
1.3 Due errors to the mode or to conditions of use
Errors of rapidity:
the speed of reply of a sensor and the equipment associated is generally
finished and all undertaken measure before is not reached the permanent
regime is besmirched errors.
Error of fineness: the presence of a sensor can modify substantial
manner the value of a @@mesurande
1.4 Errors in the brute data exploitation of measure
These errors result
from a wrong appreciation of corrections that it can be necessary to make
undergo to the crude result of the measure so as to to obtain some a more
just value - gap to the linearity of a collector or a conditionner supposed
linear - Selfwarm of a thermométric resistance by the current of measure
- Difference between the temperature of the sensor that is measured, and
that the middle that one wishes to know, as a result of the thermal conduction
of the wrapper or threads of connection.