Bridge Amp
Owner’s Guide
38
However, transducers have a limit to the level of excitation voltage
that can be applied before they are damaged. Some resistive elements
may start to heat at high excitation voltages, causing their resistance to
change. This degrades the accuracy of the transducer. High voltages
may also damage capacitive bridge transducer elements. To avoid
problems, the excitation voltage should be set according to the
manufacturer’s recommendation for that transducer.
To set the excitation voltage for a transducer, you will need to solder
the chosen resistor between pins 5 and 8 of the eight-pin DIN plug, as
shown in Figure 3–1. Mount the resistor as shown for maximum
clearance within the plug.
Wiring Up the Transducer
The second step in preparing a powered transducer for use with the
Bridge Amp is to wire the transducer to the DIN plug.
There are several things to note when wiring up transducers:
1. Make sure that the transducer wiring passes through the casing
before soldering the wires to the plug.
2. The transducer wires should be cut, stripped and tinned prior to
soldering, to ensure a good connection.
3. The pin numbers shown in the diagrams are the numbers marked
on most standard DIN plugs. If the plug has no numbers or
different ones, go by the layout shown here.
Wiring Up a Full-Bridge Transducer
This procedure should be used to wire full-bridge transducers only,
not half-bridge transducers. The transducer lead wires should be
soldered to the pins of the DIN plug as shown in Figure 3–2.
Excitation voltage
programming
resistor
Pin 5
Pin 8
Figure 3–1
Installing the programming
resistor (the pins are
labeled on the plug)
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