Each C5B 38 strain gage input module provides a single channel of strain gage input which is filtered, isolated, amplified, and converted to a high-level analog voltage output. This voltage output is logic-switch controlled, allowing these modules to share a common analog bus without the requirement of external multiplexers.
The C5B 38 modules are designed with a completely isolated computer-side circuit which can be floated to ±50V from Power Common (pin 16). This complete isolation means that no connection is required between I/O Common and Power Common for proper operation of the output switch. If desired, the output switch can be turned on continuously by simply connecting pin 22, the Read-Enable pin, to I/O Common (pin 19).
The C5B 38 module can interface to full-bridge or half-bridge transducers with a nominal resistance of 100 ohms to 10 kilohms. A matched pair of bridge-completion resistors (to ±1mV at +10V excitation) allows use of low-cost half-bridge or quarter-bridge transducers. The 10kHz bandwidth allows measurement of high-speed processes, such as vibration analysis.
Strain gage excitation is provided from the module by a very stable 10V or 3.333V source. The excitation supply is fully isolated, allowing the amplifier inputs to operate over the full range of the excitation voltage. This feature offers significant flexibility in real-world applications. Full-scale sensitivities of 2mV/V, 3mV/V, or 10mV/V are offered as standard. With 10V excitation, this results in ±20mV, ±30mV, or ±100mV full-scale input range, producing ±5V sull-scale output.
The input signal is processed through a pre-amplifier on the field side of the isolation barrier. This pre-amplifier has a gain-bandwidth product of 5MHz and a bandwidth limited to 10kHz. After amplification, the input signal is chopped by a proprietary chopper circuit. Isolation is provided by transformer coupling, again using a proprietary techniques to suppress transmission of common mode spikes or surges. The module is powered from ±5VDC (±5%).
A special input circuit on the module provides protection against accidental connection of power-line voltages up to 240VAC.