Manuale di Istruzione
Instruction Manual
23/08/2018
Rev.1 EN
102
5.2.5.2
Calibration
Access to this function should be made after that the calibration
verification has been
carried out (see chapter 5.2.5.1).
This menu allows the calibration to be adjusted so as to optimise the linearity of the
system. The operator can divide the full scale of the testing unit in up to a maximum six
user definable steps. The software then automatically foresees the interpolation of these
steps so as to calculate the calibration curve of the unit over its complete range.
WARNING:
The
CALIBRATION
menu should only be entered when the calibration needs to be
changed. Do not enter into this menu for any other reason.
Before entering the
CALIBRATION
menu, it is vital to carefully read and understand the procedure
described hereunder. If any doubts remain, contact CONTROLS service department for
further clarification.
CONTROLS will accept no responsibility for any inconvenience caused by wrongful
calibration.
1.
Access the
CALIBRATION
screen and select the channel to calibrate (the latter is
only required if also the second channel has been activated into the system);
Fig. 5-20
2.
The calibration of the system is performed by loading the system to a number of
known load steps (maximum 6 load steps, including the first step that is always 0)
that are achieved by making reference to an external reference system (e.g. loadcell
plus its match readout unit) and taking note of the bits reading on the display of the
WIZARD 2
at these load steps (see figures highlighted in previous figure). The
applied load steps should remain within the calibrated measurement range of the test
frame, normally from 10% or 20% up to 100% of the full scale.
The recorded readings, that is the values displayed by the
WIZARD 2
at known
reference loads, will be used for the calculation of the calibration coefficients.
If the system is sufficiently linear and the measurement range is from 10-20% to full
scale it is sufficient to use one calibration point, normally between 40 and 50% of
the full scale. This calibration is of the linear type, that is it is based on a single
calibration coefficient with no interpolation. This is the easiest and quickest
calibration method and is the standard method which is normally used.
If more accurate calibration must be reached at particularly low loads, it is necessary
to make more readings above all at the beginning of the measurement range.
Normally readings are made at 1%, 3%, 5%, 10% and 50-70%.
Particular operator experience or needs may lead to the use of other measurement
values.
Summary of Contents for WIZARD 2 50-C13A0X
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