Anomaly Detect - HBM SomatXR CX23-R User Manual

4 Setting up and running a test
52
Units: Enter the physical units of measurement for the computed channel.
Data type: The format of the channel data output (read only).
Custom column information: Enter the desired information. The system treats
all input as free formatted text. This means it will sort alphabetically, but not
alphanumerically (e.g., input values of "1", "2", "11", will be sorted descending as
"1", "11", "2"). Use leading zeros to realize alphanumeric sorting.
Range min and Range max: Enter the expected extreme values of the
computed channel output.
Alarm min / Alarm max: Enter the desired values for min and/or max alarms as
a physical units value or as a % of Range min/max value.
Warning min / Warning max: Enter the desired values for min and/or max
warnings as a physical units value or as a % of Range min/max value.
Chart type: Set the default chart type for the channel. Not in edit dialog.
Decimals: Select the default decimal places for channel displays. Use the "Auto"
option to apply the settings defined in the User Preferences. See
preferences > General > Decimal point handling for more information.
4.4.2 Anomaly detect
The Anomaly detect channel generates an output marking possible anomalies in
transducer or computed channel data. The channel continuously tracks the selected
parameters and outputs a status for each specified window. Use with a
trigger computed channel to generate triggers based on the anomaly detection.
NOTE
The Description is initialized on selection of the input channel.
Window samples: Specify the number of input samples used to generate one
output sample. This sets the size of the analysis window and also the associated
output sample rate (i.e., the output sample rate is the input sample rate divided by
this parameter). This can be any positive integer greater than one. The first output
sample will have a time stamp of 0 in regard to elapsed run time. Because of this,
the output data samples will appear to lead the input channel data samples when
both are plotted against elapsed run time. A Time base shifter computed channel
defined with a Lag of 1 sample can be used to change this if desired.
Flat line detect
On: Select to enable flat line detection.
o
Range gate: Specify the gate for detecting a flat line anomaly. If the difference
o
between the maximum and minimum data samples in the analysis window is
less than the specified gate, the channel adds one (1) to the output.
Drift detect
On: Select to enable drift detection.
o
Mean gate: Specify the gate for detecting a drift anomaly. Drift is measured
o
against the reference mean value of the first analysis window of each test run.
If the difference between current window mean and reference mean exceeds
the specified gate, the channel adds two (2) to the output.
Limit detect
a4275-8.0 en HBM: public
User
Bitmap
CX23-R and EX23-R