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6.7.10 Counting accuracy
In the setting mode you can influence the counting accuracy of your scale in the program settings / counting.
> Standard reference quantity
The reference quantity 10 is set at the factory.
You can set this number between 1 and 99.
For small parts, it is advisable to use a larger number of parts to determine the reference weight.
> Minimum reference weight
The counting scale checks whether the total weight of the reference parts falls below a minimum
reference weight. Basis for the calculation is the smallest digit of the scale multiplied by a value
stored in the setting mode. Factory setting is the factor 10, i.e. 10 digit steps. Values between 1 and
50 are possible.
If the minimum reference weight is not reached or if the calculated reference weight is smaller than
the scale interval (the smallest scale interval for multiple range scales), the calculated quantity is
marked with an asterisk in the display for the user's information.
If a reference part falls below 10% of the smallest digit of the connected scale, then it is not possible
to determine a reference weight for these parts,
"Error 04 Reference weight too small" appears in the
display. These parts should be
counted
with a scale with a smaller numerical increment.
Example for a scale with 1 g increments:
factory setting is 10 d = 10 g for the total weight of the reference parts.
If you reduce the factory setting to 5 d, the scale will accept 5 g as the minimum weight for the total
weight of the reference parts. If you increase the factory setting to 20 d, the scale will accept 20 g as
the minimum weight for the total weight of the reference parts.
> Optimisation Ref. (reference weight optimisation )
The reference weight of a batch, determined by the reference weight calculation from, for example, 10
or 20 parts, is usually not the "real average weight" of a part from the entire batch. In a batch there is
always the lightest and the heaviest part somewhere. The difference between the two parts is the
manufacturing tolerance, which influences the counting accuracy.
The reference weight determination at the beginning of a counting process of e.g. 10 or 20 parts, is
made from a "randomly" taken number of parts, which naturally differs from the "real average weight"
(reference weight). Therefore, it would be desirable for the accuracy of the counting results if the
reference weight could be determined not only once at the beginning of the counting process, but
several times during the counting process, from an ever increasing number of parts.
The solution to this problem is reference weight optimisation.
After the reference weight has been determined on the basis of a reference quantity, e.g. 10 or 20
parts, the reference quantity (initial quantity) is first shown in the display. Now further parts are placed
on the machine. When the scale has reached stability, a new reference weight is determined using the
quantity shown in the display and a new "average reference weight" is calculated. This procedure can
be repeated as often as required as long as the following rule is observed: