A compact Signal Amplifier to make optimal signal processing being connected with the Servo type Accelerometers. It is used for Vibration Acceleration Measurement, Waveform Observation, for various Analysis in combination with the AC Voltage Meter, Oscilloscope, FFT Analyzer respectively. Furthermore, Voltage signals from the Microphones or Sound Level Meters can be output to the instruments like Recorders along with the Vibration Signals.