X90 mobile modules
X90 mobile system User's manual V 1.20 - Translation of the original manual
177
Vdi3832KtRaw
Name:
Vdi3832KtRaw01 to Vdi3832KtRaw04
Registers for reading the raw K(t) value (per VDI 3832 guideline) of the respective channel.
Vdi3832KtRaw is formed from the raw signal of the oscillation acceleration up to the maximum frequency configured
in register
"MaxFrequencyRaw" on page 186
.
Format
Unit
REAL
1
5.4.1.5.7.5 Kurtosis
Kurtosis is an effective characteristic value for assessing the number of peaks in a signal. Kurtosis (peakedness,
fourth statistical moment) is defined as the ratio of two statistical characteristic values/processes.
Kurtosis is a type of weighted
Crest factor
. The signal peaks are valued higher than the "signal noise" (also called
the carpet value) due to the fourth power of the integral. Not only is the RMS value also used, but the entire signal
progression as well. This increases the informational value of this characteristic value.
Information:
The kurtosis factor is standardized at 0 in the module.
A kurtosis factor of less than 2 is typical of a machine in good condition.
KurtosisRaw
Name:
KurtosisRaw01 to KurtosisRaw04
Registers to read the kurtosis factor of the respective channel.
KurtosisRaw is formed from the raw signal of the oscillation acceleration up to the maximum frequency configured
in register
"MaxFrequencyRaw" on page 186
.
Since this register value is divided by the RMS value in the module (
"RmsRaw" on page 174
), there may be an
overflow if the RMS value is very small. To prevent this, the module has an internal lower limit of 1 mg for the
RMS value.
Format
Unit
REAL
1
