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8.3
4-wire connection
If you connect 6-wire transducers to 4-wire amplifiers, you must connect the transducer
sense leads to the corresponding excitation voltage leads: Marking (+) with (+) and mark
ing (-) with (-), see Fig. 8.1.
This measure reduces the cable resistance of the excitation voltage leads, among other
effects. If you are using an amplifier with a 4-wire circuit, the output signal and the tem
perature dependency of the output signal (TK
temperature. If you use the 4-wire configuration described above, this will result in
slightly higher measurement errors. An amplifier system using a 6-wire circuit can per
fectly compensate for these effects.
If you are using the sensor with a 4-wire configuration, it is essential to consider this in
the calibration.
8.4
EMC protection
Electrical and magnetic fields can often induce interference voltages in the measuring
circuit. Therefore please note the following:
S
Use only shielded, low-capacitance measurement cables (HBM cables fulfill both con
ditions).
S
Do not route the measurement cables parallel to power lines and control circuits. If
this cannot be avoided, protect the measurement cable with steel conduits, for exam
ple.
S
Avoid stray fields from transformers, motors and contact switches.
S
Connect all devices in the measurement chain to the same protective conductor.
S
Always fit the cable shield all over the surface of the connector housing.
22
) depend on the length of the cable and the
C
ELECTRICAL CONNECTION
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