HBK 10M0, Mounting Instructions, Page: 18 / 106

C5
ELECTRICAL CONNECTION
16
Threaded connector Bayonet connector
Fig. 8.2 Pin assignment for HBM cables
With this cable assignment, the output voltage on the amplifier is positive in the pressure
direction when the transducer is loaded.
The cable shield is connected to the transducer housing. This produces a Faraday cage
which covers the sensor, the cable and – provided it is correctly wired – the connector to
the signal conditioner, therefore ensuring optimum reliability even in the critical EMC
environment.
Only use plugs that meet EMC guidelines. The shielding must be fitted flat all over the
surface. With other connection techniques, an EMC-proof shield must be provided in the
stranded wire area and this shielding should also be connected extensively (also see
HBM Greenline Information).
8.1 Shortening or extending the cable
We cannot recommend extending the connection cable. HBK offers cables in various
lengths (also with fitted plug for sensor and amplifier).
8.2 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
marking (-) with (-),
see Fig. 8.1 . This measure reduces the cable resistance of the
excitation voltage leads, among other effects. If you use an amplifier with a 4-wire
configuration, the output signal and temperature dependence of the output signal (TCS)
depend on the length of the cable and the temperature. If you use the 4-wire
configuration described above, this will result in slightly higher measurement errors. An
amplifier system using the 6-wire configuration can perfectly compensate for these
effects.
If you are using the sensor with a 4-wire configuration, it is essential to consider this in
the calibration.