Electrical Connection; Connection With Four-Wire Configuration - HBM SLB-700A/06 Notice De Montage

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Electrical connection

The following can be connected for measurement signal conditioning:
• Carrier‐frequency amplifier
• DC amplifier
designed for strain gage measurement systems.
6.1 Connection with four‐wire configuration
Strain transducers are delivered in a four‐wire configuration and with a 6 m
(SLB-700A/06-1) or 12 m (SLB-700A/12-1), four‐wire connection cable with
free ends.
Cable shield, connected
to the housing
Fig. 6.1: Transducer with a four‐wire connection cable
With this cable assignment, the output voltage at the amplifier is positive when
the transducer is loaded with positive strain (positive change in length). If you
need a negative output voltage at the amplifier with positive transducer strain,
swap the two measurement signal leads over.
For a parallel connection of several SLB700A, cable wires with the same color
are interconnected. A parallel connection is particularly recommended in the
event of superposition of the useful signal by bending, caused, for example by
wind loads, or by non‐centric force application. The strain transducers must
be attached so that one transducer is always exposed to the bending com­
pressions and the other transducer to the bending strains. Because of the par­
allel connection, the opposing output signals are arithmetically averaged and
the interference signal caused by bending can be almost completely compen­
sated.
The connection cable shielding is connected to the transducer housing. Trans­
ducers with free cable ends must be fitted with connectors complying with
HBM
1: white Measurement signal (+)
2: black Excitation voltage (-)
4: red Measurement signal (-)
3: blue Excitation voltage (+)
SLB-700A/06, SLB-700A/12
A2112-3.0 en/de/fr