Connection
Shielding design
MGCplus A0534-30.0 HBM: public 37
Notice
All parts of the measurement chain (including all cable connection points
such as plugs and couplings) must be surrounded by a closed EMC-tested
shield. Shield junctions must represent a full contact, closed and low-imped
ance connection. This is the case for original HBM plug connections.
Ground connection and grounding
As the signal ground and shielding are separated in EMC-compliant cabling,
the shielding can be connected at more than one point to the ground, i.e. via
the transducer (metal housing) and the amplifier (housing is connected to
the ground conductor).
If there are differences in potential in the measuring system, a potential
compensating line must be laid (recommended value: highly flexible
stranded wire, wire cross section 10mm
2
). Signal and data leads must be
set up so they are physically separated from current-carrying power lines.
Ideally, cable ducts made of sheet metal with an internal partition should be
used. Signal ground, ground and shielding must be laid out separated as
much possible.
In order to minimize the effect of electromagnetic interference and differ
ences in potential, the signal ground and ground (or shielding) are designed
to be physically separate in the HBM devices. The ground connection or a
separate mains protective conductor should serve as the ground connec
tion, as is the case for potential compensation in buildings, for example. The
ground cable should not be connected to a radiator body, water pipe or simi
lar objects.
Connecting transducers with double shield technique
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