Test configuration
Computed channels
Computed channels are data channels derived from one or more input channels or other computed channels. The computed channel grid displays all computed channels defined for the current setup.
See Grid interface for information about showing and hiding columns.
A list may be sorted by a column's contents, including the Collect column in Test configuration. However, while sorting by the Collect column in the All input channels tab, Computed channels will be sorted separately, below other input channels.
Each computed channel type has its own tab view. Within each of these tabs, only computed channels of that type are visible. Tabs are automatically made visible when computed channels are created.
On a channels tab, a number shows for total channels in the list.
To filter the channels listed, click the Search icon in the Quick link buttons. Enter information in the search bar. The list will show channels containing the entered information. A red number also shows on the tab, which is the number of channels resulting from the search.
While a search is active, the Search icon will change color.
Clear the search bar to end filtering.
Available computed channels:
- Anomaly detect
- Bitmap trigger
- Directional velocity
- Down sampler
- Function generator
- Integrator
- Interactive trigger
- Over range detector
- Pulse frequency
- Run stopper
- Signal calculator
- Smoothing filter
- State mapper
- Statistics
- Time base shifter
- Time channel
- Timed trigger
- Track
- Triggered latch
- Triggered zero suppression
- Up sampler
NOTE
The Profile Generator computed channel is for HBM internal use only and is not supported for other users.

Many parameters are common across all computed channels and are displayed in the All computed channels tab:
- Name: Enter a name for the channel. The name must be unique and contain valid characters (invalid characters are single and double quotes, '\', '@', '#', '&', '<' and '>'). Invalid channel names are 'true' and 'false' (case sensitive).
- Collect: Select the Collect checkbox to write the channel data to the SIE data file during a test run.
- Description: Enter an optional detailed description of the computed channel.
- Input channel with sample rate: Set the desired input channel. In the edit dialog, the channel sample rate is displayed in S/s.
- Measurand: Enter the quantity being measured or the type of measurement associated with the computed channel.
- 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: For each column to be used, enter a unique name for the column header. Select either the “Text” or the “Numeric” sorting option.
- 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 User preferences > General > Decimal point handling for more information.

There are two options to add a computed channel.
- Click
Add to create a new blank computed channel. If adding from the All computed channels tab, select the type of computed channel to add. If adding from another tab, the new computed channel is the same type as the selected tab. Define all necessary parameters and click OK.
- Duplicate an existing channel by selecting a channel and clicking
Copy to.... The new channel must be given a unique name. Edit any other parameters as necessary and click OK.
Once created, a channel can be used on its own or as an input to other computed channels.

Select the desired computed channel and click Edit to edit the channel parameters using the computed channel dialog.
Alternately, edit the computed channel parameters directly in the channel grid. Select the All computed channels tab to edit generic parameters and the channel type tab to edit channel specific parameters.
If the computed channel name is changed, all references to the channel from other computed channels or DataModes change automatically.

To copy the properties from one channel to another, select the channel to be copied and click Copy. Select the parameters to copy. The parameters depend on the selected channel type. In addition, parameters hidden in the grid view do not display in the copy dialog. Click OK to copy the selected parameters.
Select the target channel and click Paste to paste the copied parameters into the selected channel. Only parameters that exist in the target channel are pasted.

Select the desired channel or channels and click Remove. Removing channels referenced by other computed channels or DataModes results in an error. Computed channels cannot be recovered after removal.

To view a digital display of the current channel values, select one or more channels and click Digital Meter.
Click Freeze to pause the reading
NOTE
Digital meters cannot be displayed while a test is running.