16
SLB-700A
HBM
A2112-1.0 de/en/fr
The surface condition (R
a
v
3.2) of the measurement object must be
sufficiently flat.
It is absolutely essential that there is no residual paint or varnish in the
transducer installation area.
Where the surface condition is good, the zero signal of the attached strain
transducer will be approx. 10 % of the useful signal. If open to the elements
and if there is a risk of mechanical damage, the transducer should be covered
by an enclosure (watch out for condensation water! ).
4
Electrical connection
The strain transducer comes with a 6 m long, four-wire connection cable and
is calibrated using four-wire technology.
SLB700A/06 cable assignment
Connection
Wire colour
Excitation voltage (+)
blue
Excitation voltage (
−
)
black
Measurement signal (+)
white
Measurement signal (
−
)
red
Cable shield
connected to enclosure
When connecting several SLB700As in parallel, wires of the same colour are
interconnected. Parallel connection is particularly recommended for beating
the useful signal by bending, such as can occur through wind loads or through
force introductions which are not centered. The strain transducers have to be
attached so that one transducer is always exposed to bending upsets, the
other to bending strains. The parallel connection enables the opposing output
signals to be determined arithmetically, thus compensating the interference
signal by bending.
5
Mechanical interference effects
The measuring body of the SLB700A is designed to compensate as much as
possible interference effects caused by torsion or bending.
In addition to this, a second SLB700A attached opposite and connected in
parallel, can minimise these superimposed disturbance variables.