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What is known...

Permissible limits of Maximum permissible
a metrological characteristic MPL errors G
F: Limites tolérées d’une charactéristique F: Erreurs maximales tolérées G
métrologique MPL D: Fehlergrenzen G
D: Grenzwerte eines Messtechnischen These errors are assimilated to the "Permissible­
Merkmals MPL limits of a metrological characteristic MPL".
Extreme permissible values of a metrological Being related to both upper and lower highest
characteristic of a given measuring equipment, deviations of a measuring instrument, they are
according to specifications or standards of the usually symmetrical in practical metrology and,
manufacturer or others. therefore, stated as single value, without any
sign.
Maximum permissible errors for
a metrological characteristic MPE
F: Erreurs maximales tolérées d’une Deviation span of indication
charactéristique métrologique MPE F : Champ d’erreur d’indication
D: Grenzwerte für Messabweichungen für D: Abweichungsspanne
ein messtechnisches Merkmal MPE This deviation span matches the distance from
Extreme values of the permissible error for a the highest to the lowest point of a coordinate
metrological characteristic of a given measuring as shown on the relevant diagram. The value
equipment, according to specifications or stan- obtained is either applicable to whole or the local
dards of the manufacturer or others. measuring span or measuring range.
All required measurements are carried out in
one direction (without reversal of the measuring
Repeatability force) – i.e. with upward plunger movement for
F: Fidélité (répétabilité) a dial gauge. For those needed to establish the
D: Wiederholpräzision whole deviation span, they are performed in both
Ability of a measuring instrument to repeat directions (with reversal of the measuring force)
the results obtained from the same measurand – i.e. with upward and downward movement of
successively measured in the same direction, the plunger for a dial gauge.
also under the same conditions.
Repeatability, which delivers important in­for­
mation for the assessment of the uncertainty Hysteresis
of measurement, is quantitatively expressed as F: Hystérésis
standard deviation of dispersion values. D: (Messwert-) Umkehrspanne
Hysteresis expresses the difference between
Repeatability limit various indications of a measuring instrument.
F: Fidélité (répétabilité) limite This value is achieved through measurements
D: Wiederholgrenze of the increasing/decreasing value of the same
Extreme value for repeatability. measurand, taken under the same conditions.
Hysteresis, which is quantitatively stated as
standard deviation of value dispersion, can be
determined anywhere within the measuring span
or range. Its amount can also be obtained from
the diagram of the deviation span as a whole.

0 Repeatability 0 Hysteresis
90 10 90 10
80 20 0 80 20 0
90 10 90 10
70 30 80 20 70 30 80 20
60 40 70 30 60 40 70 30
50 60 40 50 60 40

50 50

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