TECHNICAL INFORMATION, ID Bar Code
C-20 Sysmex SF-3000 Operator's Manual -- Revised September 1995
3.5 Dimensions of Bar Code Label
When each part of the label is named as in Figure C-7 below:
(a) The leading and trailing spaces should be greater than or equal to 2.5 mm.
(b) The effective length of bars should be less than or equal to 40 mm. This length is
related to the ease of placing the label. The physical absolute maximum length is
48 mm.
(c) The bar height should be greater than or equal to 20 mm. This height is
theoretically required to be at least 5 mm to scan lines. However, a label of which
bar height is only 5-10 mm may cause problems as the tube may rotate to
sufficiently prevent the instrument from reading the bar code.
Bar Height
Figure C-7: Bar Code Label
3.6 Check-Digit
The bar code ID system requires the check-digit(s) to be added on the bar code label to
improve the reliability of the ID number.
(A) Modulus 10/Weight 3
This Modulus 10/Weight 3 method is used in the bar code symbology such as
JAN/EAN/UPC and ITF (Interleaved 2 of 5). Check digit computation method is shown
as follows;
(1) The least significant digit (right most digit) and all digits that occur on the odd
position from right to left within the data digits are defined as odd digits. All the
digits are divided into two groups, odd digits and even digits.
(2) Add all odd digits. Multiply the sum by 3.
(3) Add all even digits.
(4) Add the result of (2) and result of (3) above.
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