AUSZUG
Section 2
PROPERTIES OF PUNCHED TAPE APPLICABLE AT THE TIME OF PUNCHING
2.1 Dimensions of information
It is highly desirable, for physical interchange of punched tapes, that the tape should be punched in an environment within the range of 40 % to 60 % Relative Humidity.
If however, due to uncontrolled circumstances, the environmental conditions prevailing at the time of punching are above 60 % R. H. or below 40 % R. H. respectively, it may prove necessary to make a special arrangement between the sender and the receiver in order to ensure satisfactory reading. (See Appendix 3).
2.1.1 Track positioning
Within a row the distance of the centres of the code holes from the centre of the feed hole shall be
2,54 n ± 0,05 mm,
where n is an integer.
2.1.2 Row positioning
The distance between two adjacent rows shall be
2,540 mm ± 0,075 mm,
measured at the feed holes.
The tolerance on alignment of holes within a row is ± 0,075 mm, measured between the centre of the hole and a line drawn at right angles to the reference edge (to be defined in 2.2.1), and passing through the centre of the feed hole.
The permissible spacing error along the feed track between centres of feed holes shall not exceed
± 0,25 mm in a span of 10 spaces (25,4 mm)
± 0,63 mm in a span of 50 spaces (127,0 mm)