Meggitt Sensing Systems’ Endevco 6634C vibration amplifier meets the rigorous demands of jet engine testing and aircraft auxiliary power unit (APU) vibration measurements. The microprocessor-based vibration amplifier is designed to condition and display rotating machinery data while offering simultaneous outputs as broadband, acceleration, velocity, and displacement. It accepts inputs from a single-ended, differential piezoelectric or ISOTRON (IEPE) accelerometer, velocity coil, or remote charge converter. Full-scale ac and dc output ranges, as well as sensitivity, are user-programmable in selectable engineering units. Up to 10 unique setups can be stored and recalled from the nonvolatile memory, while two alarm outputs provide warning and alert functions.