6Pack
6Pack allows up to six measurements to be taken simultaneously from a single data stream/channel (across a maximum of two channels for a total of 12 measurements). All standard condition monitoring data can be acquired in one step and in the time normally required to take a single conventional recording.
A 6Pack recording may include some or all of the following measurement types for each recorded channel:
- High Frequency Spectrum
- High Frequency Waveform
- Low Frequency Spectrum
- Low Frequency Waveform
- Demodulation Spectrum
- Demodulation Waveform
- From the Main Menu press
Measure then press 
6Pack. - Use the left-hand arrow keys to select a parameter set or press
to create a new one and set the parameters as required. - Press
Spectrum Waveform, 
HF Fmax (Dmax) or Demod Band (Dmin) then use keys , 
and 
to select the measurement types you wish to record. - Press
to begin sampling.
Note: The six recording types that comprise a 6Pack measurement are saved as a single recording for each channel, not as individual High Frequency, Low Frequency and Demodulation.
Streamlined Parameter Settings
The following simplifications have been applied to 6Pack measurements:
- The sensor type must be Accelerometer.
- The High Frequency and Demodulation measurements are measured in Acceleration units only.
- All spectra and waveforms have the same resolution (maximum 800 lines, 2048 samples).
- The Demod Bandwidth upper limit is automatically set to equal the HF Fmax.
- Averaging type, number and overlap are the same for all spectra.
- Fmin and Demodulation Fmin are the same.
- Fmax and Demod Fmax are the same.
Note: There are many charts displayed when using the 6Pack feature, especially when measuring with two channels. See the Viewing Multiple Charts (page 47) section for more information on multi-chart layout options.
6Pack Demodulation Processing
6Pack measurements use a slightly different Demod algorithm to that 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, yet it 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 its response to typical impacting signals is very close to that of classic Demod.
Users should not see a marked difference when switching to the 6Pack method.
Last Reviewed: 11/Jun/2009 Source: vbSeries Reference Guide Revision 24 Mar 2009 - pages 68 -70