Section 4 — Measurement Types and their Uses576Pack Demodulation Processing6Pack measurements use a slightly different Demod algorithm to theone used when taking ”Demod” measurements (the classic algorithm).The new algorithm performs ‘enveloping’ around the high frequencyimpact events, in much the same way a user does by eye when viewinga high frequency waveform. By contrast, classic Demod relies onrectification and low pass filtering to achieve a similar result. The newalgorithm works very well over a wide range of impact signals, but usesfar less computing power than classic Demod. This allows the 6Packsystem to operate at full 40 kHz speed on two channels simultaneously,providing twelve processed outputs.The new algorithm has been carefully calibrated so that its response totypical impacting signals is very close to that of classic Demod. Youshould NOT see a marked difference when switching to the 6Packmethod.
