Extension Cables And Cable Shortening - HBM C10 Montageanleitung

Electrical connection
If the force transducer is to be connected to an amplifier working in a four wire
configuration, the sense leads must be short-circuited with the relevant
excitation voltage leads: marking (+) with (+), and correspondingly, excitation
voltage lead (­) with sense lead (­).
Please note: The six wire circuit regulates the cable resistances, allowing the
measurement system to work independently of the connection cable length and
any variations of measuring lead temperature. This electrical compensation of
cable resistances does not occur when a four wire circuit is used. The
uncertainty changes subject to the cable resistances, changes in temperature
act as sensitivity changes.
The connection cable shield is connected to the transducer housing. If you are
not using the pre-assembled HBM cable, please connect the cable shield to the
cable socket housing. Use shielded plugs on the free ends of the cable to be
connected to the amplifier system, with the shielding extensively applied. With
other connection techniques, a good EMC shield must be provided in the
stranded area, where the shielding must also be extensively applied.
7.2

Extension cables and cable shortening

As the transducer is implemented in a six wire configuration, you can shorten
the connecting cables without detriment to the measurement accuracy.
Connection cables are available from HBM in various lengths, so extension
cables are not generally necessary. Use a C10 with an integrated cable, or if
you want to extend a connection cable, you can do so without expecting a
reduction in measurement accuracy. The maximum cable length depends on
the ohmic resistance of the cable and the amplifier used, so please consult the
amplifier system operating manual.
Only use low-capacitance, shielded measurement cables as extension cables.
A perfect electrical connection with low contact resistance is essential, and the
cable shield must continue to be extensively connected. Note that the
protection class of your force transducer will fall if the cable connection is loose
and water can get into the cable. Transducers with an integrated cable can be
irreparably damaged and fail under these circumstances.
C10 25
A04036_01_YI0_03 HBM: public