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Electrical connection
8.3
Connection in a four-wire configuration
When transducers in a six-wire configuration are connected to amplifiers in a
four-wire configuration, the sense leads of the transducers must be connected
to the corresponding excitation voltage leads: marking (+) with (+) and marking
(-) with (-). This measure also reduces the cable resistance of the excitation
voltage leads. If you use an amplifier with a 4-wire circuit, the output signal and
the temperature dependence of the output signal (TCS) depend on the length
of the cable and the temperature. If you use the 4-wire circuit as described
above, this will result in slightly higher measurement errors. An amplifier
system working with a 6-wire circuit ensures perfect compensation 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
Parallel connection of individual measuring circuits
The four measuring circuits can be connected in parallel to use the sensor as a
reference force transducer. HBM calibration is performed with the measuring
circuits connected in parallel.
A wiring box can be ordered from HBM for parallel connections. You can also
implement a parallel connection without this box. To do this connect the identi
cal connections of the individual Wheatstone bridges with each other.
Since you have connected the measuring bridges electrically, the input re
sistance drops to about 175 ohms. The amplifier system must be suitable for
this. (minimum requirement: 160 ohms)
8.5
EMC protection
Electrical and magnetic fields can often induce interference voltages in the
measuring circuit. Therefore please note the following:
S Use shielded, low-capacitance measurement cables only (HBM cables fulfill
both conditions).
18
A04785_01_YCI_02 HBM: public
KDB
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