Notes For Cabling - HBM TB1A Montageanleitung

Electrical connection
26
6.1

Notes for cabling

Electrical and magnetic fields often cause interference
voltages to be injected into the measuring circuit. This
interference starts primarily from power lines lying
parallel to the measuring leads, but can also start from
any contactors or electric motors in the vicinity. In
addition, interference voltages can be injected
galvanically, especially if the measurement chain is
grounded at several points.
Please take note of the following:
S
Use only shielded and low‐capacitance measurement
cables from HBM.
S
Do not install measurement cables parallel to power
lines or control circuits. If this is not possible (e.g. in
cable shafts), protect the measurement cable by
armoured steel tubing, for example and keep it a
minimum of 50 cm away from other cables. Power
lines or control circuits should be twisted together (15
twists per meter).
S
The stray fields of transformers, motors and
contactors should be avoided.
S
Do not ground transducers, amplifiers and indicating
instruments repeatedly. All the devices of the
measurement chain should be connected to the same
grounded conductor.
S
The shield of the connection cable is connected to the
transducer housing.
S
Connection diagram, grounding concept (Greenline).
Grounding concept (Greenline).
The cable shielding is connected in accordance with the
Greenline concept. This encloses the measurement
A0162-8.0 HBM: public
TB1A