HBM QuantumX - Active Transducer Connection

Modules and transducers
74 A03031_24_E00_01 HBM: public QuantumX
Notice
All parts of the measurement chain (including all cable connection points such
as plugs and couplings) must be surrounded by a closed EMC-proof shield.
Shield junctions must represent a full contact, closed and low-impedance con
nection. 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
grounded conductor).
If there are differences in potential in the measuring system, a potential com
pensating line must be laid (reference value: highly flexible stranded wire, wire
cross section 10mm
2
). Signal and data leads must be set up physically separ
ated 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 as separated as possible.
In order to minimize the effect of electromagnetic interference and differences
in potential, the signal ground and ground (or shielding) are designed to be
physically separate in the HBM devices. The grounded supply connector or a
separate ground potential lead should serve as the ground connection, 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 similar objects.
8.1.2 Active transducer connection
Some modules can supply active transducers with a supply voltage of 5…24 V.
When using the adjustable transducer excitation, electrical isolation from the
supply voltage of the amplifier is not required.
The maximum permissible power consumption is 700 mW per channel, but no
more than 2 W total. If the power consumption is more than 700 mW on one
channel, the transducer excitation of this channel will switch off. If the power
consumption exceeds a total of 2 W, the device may switch off.