Cable Extension; Downstream Devices; Transducer Sensitivity - HBM DD1 Montageanleitung

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9.2 Cable extension

If special circumstances make it necessary to lengthen the connection cable,
particularly long cables will alter the overall sensitivity of the transducer plus
cable. When operating with DC voltage this sensitivity change is caused by
ohmic cable resistance. When operating with carrier frequency the cause is
the combined effect of capacitance in the cable wires and cable asymmetry.
In the event of long cables it is advisable not only to use special cable from
HBM but also to calibrate the measurement configuration using a defined
deflection of the transducer probe.

9.3 Downstream devices

The DD1 transducer can be operated with all the measuring amplifiers
commonly used in strain gage technology, but it is important to provide an
excitation voltage of the correct value. Both DC voltage and carrier-frequency
amplifiers can be used.

9.4 Transducer sensitivity

The transducer is calibrated to a sensitivity of 1mV/V of excitation voltage and
per mm of displacement:
1 mm of displacement = 1 mV/V
This sensitivity applies to the whole measuring range of "2.5 mm
displacement with an uncertainty of < 0.5 %. The specified sensitivity
assumes transducer excitation with impressed voltage (internal resistance of
voltage source R
s
HBM
= 0).
DD1
A0781-3.0 de/en