X90 mobile modules
178
X90 mobile system User's manual V 1.20 - Translation of the original manual
5.4.1.5.7.6 Skewness factor
The skewness factor (skewness, third statistical moment) specifies the degree of a signal's asymmetry in reference
to its standard distribution. The lower the skewness, the more evenly distributed the signal. A signal with a high
skewness factor has many large amplitudes in the assessment range.
A symmetrically distributed signal has a skewness factor of 0. Depending on the direction of the slant, the skewness
can be positive or negative. A considerable slant means approximately a skewness factor of ±1.
A large kurtosis factor combined with a large skewness factor indicates electrostatic discharge.
SkewnessRaw
Name:
SkewnessRaw01 to SkewnessRaw04
Registers to read the skewness factor of the respective channel.
SkewnessRaw 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
5.4.1.5.7.7 FrequencyBand
Name:
FrequencyBand01 to FrequencyBand32
Registers for reading the respective frequency band.
If the frequency band is configured to a velocity signal, this value is only calculated if bit EnableVelocityCalculation
(configuration in register
"SensorConfig" on page 158
) of the corresponding channel is set; otherwise, 0 is output.
For more information, see
"Frequency bands" on page 155
.
Format
Resolution and unit
Value on overflow
24-bit unsigned
0.001 g or 0.001 mm/s
Depends on the configuration
16777215
24-bit unsigned
1/65536 g or 1/65536 mm/s
Depends on the configuration
16777215
Parameter after preparation by Automation Runtime.
Format
Unit
REAL
mg or mm/s depending on the configuration
