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Virtual trends can be output using virtual channels, telegrams, or digital outputs. Note that the virtual trend type impacts the type of calculation on the CMU and thus has an influence on the possible output. The table below shows an overview of the different virtual trends and calculation types on the CMU.

Statistical level and level from time signal

Virtual trends

Calculation time

Update time

Min, Max, AVG, Peak to Peak, Crest factor, RMS, URg

Always calculated for each incoming data buffer (regardless of the measurement condition)

Measurement time/10 (e.g. 1.31 s for default measurement time of 13.1 s)

RMS 1-10, RMS 10-2000

Only calculated if values are required for an output

RMS 2000-20000, Med, SD, K(t), ISO, ISO 3-1000, ISO 10-1000

Damage level from frequency range

  • Calculation time: Calculation only after a valid measurement (trigger condition must be met over the entire measurement time)

  • Update time: One value after each snapshot

Virtual trends

  • Shaft

  • Local error

  • Imbalance

  • Shaft level

  • Bearing

  • FFT/ENV inner race

  • FFT/ENV outer race

  • FFT/ENV rolling

  • FFT/ENV cage

  • Gear

  • Gear mesh

  • Gear damage

  • Gear wear

  • Fan

  • Fan blade

  • Belt pulley

  • FFT belt

  • ENV belt

  • Roll

  • FFT roll

  • Roll imbalance