X90 mobile modules
154
X90 mobile system User's manual V 1.20 - Translation of the original manual
5.4.1.5.3 General information
5.4.1.5.3.1 Signal generation
The following signals and characteristic values are calculated from the accelerometer's input signal:
MaxFrequencyEnvelope01
MinFrequencyEnvelope01
Envelope curve processing
Raw signal processing
Characteristic value processing
per ISO 10816-3
MaxFrequencyRaw01
MinFrequencyRaw01
SamplesAnalogInput01-04
AnalogInputConfig01-04
PeakHighFrequency
RmsHighFrequency
RmsAccEnvelope
RmsVelEnvelope
FrequencyBand01
...
FrequencyBand32
RmsAccRaw
RmsVelRaw
KurtiosisRaw
SkewnessRaw
CrestFactorRaw
RmsRaw
PeakRaw
Iso10816
AnalogInput01-04
Sensor
Mux
Anti-aliasing filter
HighFrequencyConfig01
5.4.1.5.3.2 Filter configuration
The option board has various configurable filters.
There is a configurable high-pass filter for the whole module that can be configured using register
"HighFrequen-
cyConfig" on page 185
. Possible settings are 500 Hz, 1 kHz and 2 kHz. This high-pass affects all high-frequency
and envelope characteristic values of all module channels.
In addition, there are 2 adjustable low pass filters per channel.
•
Filtering of the raw signal. This filter is configured using register
"MaxFrequencyRaw" on page 186
. Pos-
sible settings are 200 Hz, 500 Hz, 1 kHz, 2 kHz, 5 kHz and 10 kHz.
•
Filtering of the envelope signal. This filter is configured using register
"MaxFrequencyEnvelope" on page
185
. Possible settings are 200 Hz, 500 Hz, 1 kHz and 2 kHz.
These low-pass filters affect all calculated characteristic values of the respective signal, i.e. the raw or envelope
signal. They can be used to increase the frequency resolution of the FFT. For the characteristic value calculation
in the analog input, however, it can be selected whether the characteristic values are to be calculated from the
direct input signal or the low-pass filtered raw signal.
