Available by clicking the Edit... button in the Computed Channel dialog box. This dialog box allows you to perform statistic operation (Min, Max, Average, and Standard Deviation).
Select a range of channel numbers from the Channel Selection, and click the Add button to add the operation into the Formula column. For example, if you select the statistic operation as "Min", with channel selection Ch101 to Ch105, the formula defined will be "Min (101:105)".
This feature is to limit the last N past scanned data in the channel selection based on the selected statistic measurements (Min, Max, Average, or Standard Deviation). For example, with a specified N of 2 in the "Min" operation, it will compare the last 2 data to obtain a minimum data.
Note: Number of past measurement is not applicable for the DAQ970A Built-in Computed Channel.