ISO/TS 17242:2014/Amd 1:2017
Standards Content (sample)
Quasi-static calibration procedure for
belt force transducers
Procédure d’étalonnage quasi-statique pour capteurs d’efforts pour
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Amendment 1 to ISO/TS 17242:2014 was prepared by Technical Committee ISO/TC 22, Road vehicles,Subcommittee SC 36, Safety and impact tests.
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Quasi-static calibration procedure for belt force
Replace the first sentence with the following:
The sensor offset should be measured under no load condition. A new belt strap shall be inserted andmounted in the fixture .
Replace the third sentence with the following:
Only one loading sequence with one belt strap per test transducer up to a force level at least at 100 % of
the transducer’s calibration range shall be performed within the given velocity range.5.6
Replace the last item of the list with the following:
— non-linearity as a percentage in % of the transducer’s calibration range (for linear regression only).Annex B
Replace the entire Annex B with the following:
B.1 Linear regression
For the software linearization a least-squares fit method applied through the point of origin is used:
The starting point of the linearized line is identical with the starting point of the measurement. This
point is set to zero (point of origin). This measurement is independent of the defined evaluation interval(see 4.7). The resulting linear equation is
Fb=−()SS +D (B.1)
S = 0;
D = 0.
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For the linearization, the square sum of the difference between measured value and linearized valuemust be minimal:
σ =−Fb SS− + D (B.2)
where S , F = measured.
The differentiation is equa