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Automated Strain Conditioner 4078
Description
The Dynamics 4078 next generation dual channel programmable
Automated Strain Conditioner uses the latest surface mount technology
to produce a simple to use system for voltage excited bridge
circuits. The system comes complete with excitation, shunt calibration,
bridge completion, auto-balance and span, plus a 4 position/4 pole
low pass filter to remove unwanted signals and noise. In addition,
four LED indicators instantly notify you of the amplifier’s
operating condition regarding overload condition, calibration
operation, programming activity, and programming errors.
Design Features
The sensor interface circuits are programmable, with the exception
of manually selecting 350 or 120 Ohm bridge completion resistors.
Excitation provides 5V or 2.5V to handle both 350 and 120 Ohm
strain gages with 10V as an option. Local or Remote sense on
the excitation is provided to work with short or long distance
connecting wires to the strain gage to insure precision and
repeatable measurement. Both 120 and 350 Ohm bridge completion
resistors are also built into the 4078 module. This avoids additional
configuration requirements, such as soldering, when switching
between the two most popular strain gages. Alternatively, higher
bridge completion resistors can be installed upon request.
Bridge Completion
On-board bridge-completion resistors are provided for full, ½, or ¼-bridge completion
to accommodate a variety of sensor configurations. Bridge configuration is completely
programmable, including the selection of 120 or 350 ohm completion resistors. By setting
the configuration to the Full Bridge mode, the 5078 can also be used as a standard differential
amplifier.
Auto Balance - Auto Span
4078 modules are equipped with an Auto-Balance circuit
to balance the bridge by removing any unwanted offsets caused
by residual strain. A unique Auto-Span feature is provided to
let you automatically control the span to produce calibrated
output without manual trimpots. The span can be adjusted to
0.001%. Three distinct shunt calibration values, plus one user
configurable resistor, set the span.
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