| Relation between the measures of the security signal and the observation range. The relation between the minimum area, A, of the security signal, and the minimum range, I, to which must be able to be included, are expressed by the following formula:
where A, I, are expressed respectively in square meters and linear meters. This formula is applied for inferior distances 50m. Approximately.
In figure 2 observation the maximum distance anticipated, for a panel, they are related; with the dimension characteristic of this one, that corresponds to the diameter or greater side of himself.
Dimensions in
m/m. | Maximum distance according to the form (meters) |  |  |  | 1189
841
594
420
297
210
148
105
| 34,98
24,74
17,48
12,36
8,74
6,18
4,36
3,09 | 49,73
35,18
24,85
17,57
12,42
8,78
6,19
4,39 | 53,17
37,61
26,56
18,78
13,28
9,39
6,62
4,70 |
Figure 2. Relation between the maximum distance of Observation and the characteristic dimension. | | Dimensions.
1. Format: the dimensions of the panels and the relations among them will settle down taking, for the greater external diameter dimension, the standardized values corresponding to the Series A of the UNE 1-011-75 Norm , “Paper of writing and certain types of forms. Finished formats. Series Ay B”. The panels of rectangular form will adapt to the dimensions of Series A; using primarily the main formats on the extended ones.
Figure 1 gathers the measures of the formats of Series A. | Designation | Measures in millimeters | 4 A0
2 A0
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10 | 1.682 xs 2.378
1.189 xs 1.682
841 xs 1.189
594 xs 891
420 xs 594
297 xs 420
210 xs 297
148 xs 210
105 xs 148
74 xs 105
52 xs 74
37 xs 52
26 xs 37 |
Figure1: Formats of series A. |
Sizes 
