Aim tti 3ghz hand held counter pfm3000 aim tti pfm3000 the pfm3000 offers high sensitivity frequency measurement from 3hz to more than 3ghz in two overlapping ranges period measurement is also provided from 8ns to 330msthe pfm3000 uses a continuous reciprocal measurement technique to provide high resolution at all frequencies with rapid update it offers high sensitivity across the whole frequency range a low pass filter can be selected to reduce high frequency signal noise at lower freque