HBM HBK S2M, Mounting Instructions, Page: 24 / 124

S2M
ELECTRICAL CONNECTION
22
8 ELECTRICAL CONNECTION
The following can be connected for measurement signal conditioning:
S
Carrier‐frequency amplifier
S
DC amplifier
designed for strain gauge measurement systems.
The S2M force transducer is delivered in a six‐wire configuration.
8.1 Connection in a six‐wire configuration
The transducer is delivered with a 6 m cable with free ends as standard.
(white)
(black)
(gray)
Excitation voltage (
)
)
(green)
(red)
(Shield)
Excitation voltage (
*
)
Sense lead (
*
)
Measurement signal (
)
)
(blue)
Sense lead (
)
)
Measurement signal (
*
)
Cable shield, connected to the housing
Fig. 8.1 Pin assignment in a six‐wire circuit
With this cable assignment, the output voltage at the measuring amplifier is positive in
the tensile direction when the transducer is loaded.
The connection cable shielding is connected to the transducer housing. Transducers with
free cable ends must be fitted with connectors complying with EMC guidelines. The
shielding must be connected extensively. With other connection techniques, an
EMC‐proof shield should be applied in the wire area and this shielding should also be
connected extensively (also see HBM Greenline Information, brochure i1577).
8.2 Connection in a four‐wire configuration
When transducers with a six‐wire configuration are connected to amplifiers with a
four‐wire configuration, the sense leads of the transducer must be connected to the cor­
responding supply leads: marking (+) with (+) and marking (-) with (-),
see Fig. 8.1 . This
measure also reduces the cable resistance of the excitation voltage leads. However,
there will be a voltage loss on the supply leads due to the cable resistance that is still
present and not compensated for by the six‐wire configuration. A large part of this loss