Section 4 — Measurement Types and their Uses
57
6Pack Demodulation Processing
6Pack measurements use a slightly different Demod algorithm to the
one used when taking ”Demod” measurements (the classic algorithm).
The new algorithm performs ‘enveloping’ around the high frequency
impact events, in much the same way a user does by eye when viewing
a high frequency waveform. By contrast, classic Demod relies on
rectification and low pass filtering to achieve a similar result. The new
algorithm works very well over a wide range of impact signals, but uses
far less computing power than classic Demod. This allows the 6Pack
system 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 to
typical impacting signals is very close to that of classic Demod. You
should NOT see a marked difference when switching to the 6Pack
method.
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