CHARGE AMPLIFIERS CALIBRATION IN VIBRATION METROLOGY AT NPLI

摘要

The present work discusses the methodology and procedure followed at NPLI for calibration of charge amplifiers. The charge amplifiers are calibrated conventionally using a 1 nF standard capacitor and sine generator for gain measurements. An automated calibration system using B&K Calibration software in conjunction with a calibrated 1 nF precision adaptor controlled by Pulse Analyzer is also used for precision calibration of charge amplifiers for gain and phase measurements from 0.5 Hz to 20 kHz. The uncertainty achieved in gain calibration is reported in the present work.