Measurement-computing DBK Part 2 Instrukcja Użytkownika Strona 27

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DBK Option Cards and Module 899892 DBK43A & DBK43B, pg. 7
The Kelvin connection using the remote sensing lines performs best when the entire bridge is localized
(no bridge-completion resistors inside the DBK43A or DBK43B) and all leads are contained in a multi-
conductor cable. If individual wire leads are used, the two sense wires should be tightly twisted to form a
pair. Likewise, the two excitation wires and the two bridge-output wires should be twisted together).
The internal excitation source is attached to a voltage regulator in the strain gage module’s circuitry. The
regulator provides the excitation to the actual transducer (there is a separate regulator for each transducer,
hence 8 regulators per strain gage module). Each regulator has a maximum current of 50 mA. The
maximum excitation voltage that can be provided by the module’s excitation regulator is:
V
MAX[EXC]
= 0.05 × R (where R = the resistance in ohms of 1 element in the bridge circuit).
CAUTION
Setting the excitation voltage above the maximum voltage allowed can cause the
DBK43A or DBK43B to fail. The maximum allowable excitation voltage is determined
by the following equation.
V
MAX[EXC]
= 0.05 x R
R is the resistance in ohms of 1 element in the bridge circuit.
The following full-page figure shows various strain-gage configurations.
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