Reading Range When Mounted On Esd Carrier Materials - Siemens SIMATIC RF600 System Manual

Transponder/tags
7.3 SIMATIC RF620T
7.3.3.7

Reading range when mounted on ESD carrier materials

The transponder is generally designed for mounting on non-conductive objects which
provide the conditions for the maximum reading ranges The conductive or deflecting surface
of ESD materials limits the reading range depending on the surface resistance. Generally,
deflecting materials with a surface resistance of 1 x 10
materials with 1 x 10
Table 7- 12
Carrier plate material
Transponder on electrostatic deflecting materials,
dimensions 60 x 40 cm
(surface resistance 2 x 10
Transponder on electrostatic conductive
materials, dimensions 60 x 40 cm
(surface resistance 1 x 10
Use of spacers
100% reading range is achieved when mounted in empty, anechoic rooms. With multi-tag
capability, limitations may result in the reading range.
100
90
80
70
60
50
40
30
20
10
0
1x10 0 1x10 1 1x10
Figure 7-15 Schematic representation of how the reading range depends on the surface resistance of the ESD material
In the representation above, the two reading points with regard to the dependence of the
reading range in % on the surface resistance are shown At the same time a linear
dependence between the reading points is to be expected, however with measurement
inaccuracies. The darker the hatching, the greater the probability that the reading point is
found in the hatched area.
198
to 1 x 10
3
Limited reading range with ESD materials
ohm)
9
ohm)
4
2 1x10 3 1x10 4 1x10
ohm are available.
5
Reading range
Approx. 4 m
Approx. 1 m
Approx. 2 m
5 1x10 6 1x10 7 1x10
System Manual, 10/2009, J31069-D0171-U001-A8-7618
to 1 x 10 ohm and conductive
5 11
8 1x10 9 1x10 10 1x10 11
SIMATIC RF600