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Endevco® model 4999 low-pass filter signal conditioner is a low-noise, 16-channel signal conditioner for use with integral electronic piezoelectric, voltage transducers and Remote Charge Converters (RCC). Each channel provides a constant current supply and a selectable X1 or X10 gain setting. The unique feature of this unit is individual channel ground isolation (eliminates ground loops of various types of sensors) and very low-noise.

On the front panel, each channel is provided with a gain selector switch, cutoff frequency switch, LED indicator for cutoff frequency selected and input isolation/grounding switch.

Front and rear panel test input connectors for injecting an external calibration signal selectable for each channel Rear panel BNC Isotron® (IEPE-type), voltage inputs