–18 –
6.2 Verifying the calibration
When verifying the calibration, make sure to select the same material, calibration
position and calibration points as used for creating the associated material characteristic.
Otherwise, the precision of the measurements will not be sufcient. The tension meter
has been calibrated on material 1 according our factory procedure for a vertical material
path and cannot be deleted or overwritten. The diameters and materials are given in
Section 7.2. Calibrations of the tension meter are performed according to the factory
procedure using weights that correspond to 10%, 50% and 90% of the measuring range.
Guide roller
Guide roller
Measuring
Roller
Material to
be measured
Weight
1. Attach a weight vertically to the material to be measured that corresponds to the
tension to be measured (make sure to select the correct unit). The weight must hang
freely. (Always use a fresh portion of the material to be measured.)
2. Insert the material as described in Section 5.4
Do not let the thumbpiece snap back as this could affect the calibration and
damage the instrument.
3. Before verifying the calibration, move the instrument slowly up and down to
compensate for any mechanical friction losses and thus ensure repeatability of the
measurements.
4. The tension value shown on the display should be equal to the mass of the
suspended weight.
If the verication of the calibration shows a deviation beyond the allowable tolerance so
that reliable operation is no longer possible, the instrument needs to be re-calibrated or
returned to the factory for repair.
FIG. 14
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