Graviman Manual Download

Transcript
6.3 Load-Cell calibration.
Calibration should be checked after replacement of any part involved in weighing (Load-cell,
amplifier or analog card).
It is recommended that a calibration be performed on a regular basis as scheduled by the
customer.
Each weigh-unit must be calibrated separately.
During the calibration procedure, three tests are performed:
• Hysterasis Test: Ensures that there’s no friction in the load-cell and weighing-bucket.
• Calibration Test: Ensures the correct ratio used by the unit to convert from the loadcell voltage output to the actual displayed weight.
• Linearity Test: Ensures the linearity of the load-cell.
There are two important considerations to be taken into account:
1.
Each of these tests must be performed in order to ensure proper functioning of the
unit.
2.
There’s no point in performing a test if the unit failed a previous test. For example, if
the unit fails the hysterasis test then there’s no point in performing the calibration
test, because there’s some friction (mechanical or otherwise) that is preventing the
load-cell from working properly.
16
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