‘Ultra low noise’ remote charge converter

Written by: Laura Hopperton | Published:

Meggitt Sensing Systems has announced the relaunch of its Endevco model 2771C-XX, a low noise remote charge converter (rcc), designed to facilitate more precise measurements from piezoelectric transducers within mechanical system health monitoring, nuclear power plant/regenerative energy and environmental testing applications. The model is now being offered as a lower noise drop in replacement for legacy Endevco 2771B models or other industry equivalents.

The module is offered with three individually fixed gains of 0.1, 1.0 and 10 mV/pC. It is also said to offer a rugged two wire (IEPE), single ended design operating from constant current power (4-20mA), with a broadband noise range of 5µ Vrms and frequency response of 0.4 to 50kHz. According to Meggitt, both rcc signal output and input current are carried along the same wire. Units have been designed to withstand shock loads of up to 100g peak and are radiation tested to 1.0MRads.

The company claims that because of its low impedance voltage, signal output from the model is less susceptible to noise pick up and that hunt capacitance of the cable connecting the model to the main signal conditioner does not significantly affect system noise or sensitivity. The device has been designed to support TEDS (per IEEE P1451.4) for smart sensor and larger channel count applications, and includes an available M1 Version with male BNC to facilitate easy panel mounting. The rcc has been designed for direct compatibility with both Endevco and other industry piezoelectric charge output accelerometers.

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