Transponder
HG G-70661XA
Function
As the antenna passes over the transpon
-
der, it energizes the latter with an energy
field of 13.56 MHz. The transponder returns
its code through frequency modulation to
the antenna. A normal reading cycle, in
-
cluding all security checks, is approximate
-
ly 1 ms.
The system’s operability is guaranteed
through fluid, gaseous as well as solid met
-
al-free materials. However, if mounted di
-
rectly on or within metal, the
transponder’s reading distance is
influenced.
The Read-Write Transponders are
equipped with an EEPROM in
which the code is stored. The EE
-
PROM may be rewritten up to more
than 100,000 times. It has 32 bit
available for user data.
Dimensions and Specifications
The maximum reading distance for all tran
-
sponders can only be achieved when the
minimum distance to the metal surface is
maintained.
It is recomended to maintain the minimum
distance within the metal-free area (figure
below). The impact on positioning accuracy
and range also depends on the size and the
distance of metal parts.
As a rule of thumb it can be said that if the
metal-free area behind the transponder has
to be at least of the same range as the read
-
ing distance between transponder and an
-
tenna. The reception of the transponder
signal will be largely unattenuated (see ta
-
ble on right). It is essential, that the tran
-
sponder
does not dip into the mesh/loop
of steel reinforcement grids
. Single metal
rods, on the other hand, hardly have any in
-
fluence on the performence.
Metal Sheet
Antenna
Transponder
HG 70661
(Reading Distance)
Height h [cm]
Signal [%]
0
34
1
56
2
70
3
78
4
83
5
88
6
94
7
93
8
96
9
97
10
99
100 %
74,
6
35
5,
2
HG 70661XA
www.goetting.de
4
5
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