3. CALIBRATION CERTIFICATE -
STANDARDIZATION
The International standard ISO 7500-1:2004 defines
the calibration requirements of force testing machines, as a
scale reading device which is expressed in units of force.
Based on our research and work experience we recommend
to include to the International Standard ISO 7500-1:2004
also requirements for prestressing machines (hydraulic
jacks), where the reading scale device is expressed in units
of pressure and to classify accuracy classes.
The following tables (as an examples) demonstrate the
calibration table according to this standard (accuracy class 1
on Fig.8 and accuracy class 3 on Fig.9).