Connection In A Four-Wire Configuration; Shortening The Cable; Extension Cable - HBM PW29P Series Mounting Instructions

Electrical connection
5.2 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 transducer must be connected
to the corresponding excitation voltage leads: Marking (+) with (+) and marking
(-) with (-), see Fig. 5.1. 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 can be eliminated by a
calibration, however, the temperature‐dependent part remains.
Important
The TK value given in the specifications for the transducer therefore does not
c
apply for the cable and transducer combination when connection is in a
four‐wire configuration, where the cable percentage must be added.
5.3

Shortening the cable

If the transducer is connected to an amplifier in a six‐wire configuration, the
transducer cable can be shortened as required, without adversely affecting the
measurement accuracy.
5.4

Extension cable

Only use shielded, low‐capacitance measurement cables for extending. Ensure
that connection is perfect, with a low contact resistance.
The cable of a six‐wire transducer can be extended with a cable of the same
type.
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A03578_02_Y00_00 HBM: public
PW29P