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User manual SCAIME: NU-soft-eNod4B-E-0716_236704-C.doc
11.2 Calibration methods
Measurement scaling can be defined using one of the two following methods:
• Theoretical calibration involving the sensitivity of the sensor and a user-defined corresponding
capacity
• Physical calibration involving 1, 2 or 3 know loads (for a load cell)
Both can be achieved thanks to the functional commands.
11.3 Settings description
11.3.1 Maximum capacity
The ‘maximum capacity’ stands for the maximum sensor/load cell signal range. When the absolute value of the gross
measurement exceeds its value plus 9 divisions, the b
3
bit (positive overloading) or the b
2
bit (negative overloading) of
the measurement status is set to 1 (it can activate a logical output if it is assigned to the ‘defective measurement’
function).
The zero acquisition (on request or at power-up) is done only if the gross measurement value is contained between a
±10% range of the ‘maximum capacity’ (±2% if the legal for trade option is active).
The ‘maximum capacity’ setting also allows calibrating eNod4 in case of a theoretical calibration in association with
the sensor sensitivity. Measurement scaling will be automatically adapted so as to deliver a gross measurement value
equivalent to the ‘maximum capacity’ for an analog signal corresponding to the sensor sensitivity.
After a theoretical calibration, the maximum capacity can be changed to fit to the application.
Admitted values : from 1 up to 10000000.
11.3.2 Number of calibration segments
The ‘number of calibration segments’ defines how many calibration segments are used during the physical calibration
procedure. Linear installations only need one segment.
Admitted values : from 1 up to 3.
11.3.3 Calibration loads 1/2/3
Before starting a physical calibration procedure, each calibration segment must be given a corresponding user value
(for example, 1000 points for a 1 kg load).
Admitted values : from 1 up to 10000000.
11.3.4 Sensor sensitivity
The ‘sensor sensitivity’ setting is used to achieve a theoretical calibration. The stored value for this parameter is the
load cell sensitivity in mV/V.
The user can adapt the value delivered by eNod4 for the associated signal using the ‘maximum capacity’ and the
‘sensor sensitivity’.
This setting is expressed with a 10
-5
factor (197500 is equivalent to a 1.975 mV/V load cell sensitivity or a 1.975 V input
voltage).
Admitted values : from 1 up to 1000000.
11.3.5 Scale interval
The ‘scale interval’ is the minimal difference between two consecutive indicated values (either gross or net).
Modification of scale interval is taking into account after a new calibration.
Admitted values : 1/2/5/10/20/50/100
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