There are several possible reasons for this. The most common is that the cursor has been positioned after the last cycle in the graph window. “Find All Cycles” does not necessarily search the entire data file. It finds cycles from the current cursor position (as set by the I-beam tool) to the end of the file. Under the “Selection” tab of the cycle detector in versions of AcqKnowledge more recent than 4.2, there is a button labeled “Move Cursor to Origin”. Clicking this button may resolve the issue. For older versions of AcqKnowledge, the user should click “OK” to close the cycle detector window without erasing any applied settings, move the cursor to the beginning of the file or select all data (typing control-a – command-a on a Mac – is an efficient way to select all data), re-open the cycle detector, and choose “Find All Cycles” again. If this does not resolve the issue, then there is likely a problem with the parameters used for searching the data file. If searching for peaks in the data, the threshold may be set too high or too low such that data never cross the threshold. Ensure also that the correct channel is being searched for peaks. If searching for events, make sure that the cycle detector is searching for event marks of a type and location that exist in the file.
Page last modified 19Jan2015