ABSTRACT
DrPSrinivasulu:Youhavementionedthatthegeneralpurposeaccelerometer BNK4370whichweusedwithpracticallynolimitation-youhavecautionedusnotto buythatforgeneralpurposes.Theonlylimitationisthe100mvolts/g,butthereisnothing wrongwiththeaccelerometerassuch.Itiswhenyouusethefullscalestructurelikethat thesensitivitymightbetoosmalltomeasurebythataccelerometerbutwhatIwouldlike toemphasiseisthatwhenyouaregoinforvibrationmeasurementofafullscalestructure youhavegottolookatthesystem;accelerometer,preamplifier,recorderasonebunchand notisolatetheaccelerometeralonebecauseyoucanalsomakegoodthedeficienciesofan accelerometerbybuyingafairlysensitivepreamplificationkit.Yourcommentsonthat? DrAPavic:Ifyouhaveawrongaccelerometerwhileyoumayhaveanexcellentrest oftheequipment,thenyourinputattheveryfirstpointinthesystemcouldbecome distortedbecauseofharmonicdistortion,orwhatever,andthennothingwillhelpyou. Thatiswhy,itisveryimportanttohaveaprettygoodfrequencyresponseandother characteristicsoftheaccelerometer.WhatIhavefoundisthatwithyouraccelerometer BNK4370,theproblemisthatithasaverypoorfrequencyresponsebelow4Hz.
