On the Measure worksheet of Signature Acquisition / Signature Testing press the More... button and make sure that Monitoring is on and adjust the History size. In current versions of the software the default is 2 seconds but can be increased to 300 seconds as a buffer in later releases. Older releases may have a limit of 30 seconds or 60 sseconds but currently it can be set to larger values.
Thank you sir, that worked!
I did have to drop data from the Time History functions in the Monitor folder into my display to see all the data!