Cable Extension; Shielding Design - HBM T22 Montageanleitung

T22

3.3 Cable extension

Extension cables must be the shielded, low-capacitance type. We recommend
the use of HBM cables that comply with these requirements.
When using cable extensions, ensure that the connection is perfect, with the
lowest possible contact resistance and good insulation. For this reason all
connections should be soldered, or at the very least should use firmly fixed
terminals or screwed connectors.
Measurement cables should not be laid parallel to high-voltage lines or control
circuits (and therefore should not be laid in common cable shafts). If this is not
possible, protect the measurement cable with, for example, armoured steel
tubing and keep them as far away as possible from other cables. Avoid the
stray fields of transformers, motors and contactors.

3.4 Shielding design

The cable shielding is connected in accordance with the Greenline concept.
This encloses the measurement system in a Faraday cage. It is important that
the shield is laid flat on the housing ground at both ends of the cable. Any
electromagnetic interference active here does not affect the measurement
signal. Please comply with the connection notes.
In the case of interference caused by differences in potential (compensating
currents), separate the connections between the zero operating voltage and
the housing ground on the measuring amplifier and connect a potential
equalization line between the transducer housing and the amplifier housing
(copper wire, 10 mm
A2302-2.0 en/de
2
conductor cross-section).
11
HBM