EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 165)

Analyzing Traces and Events
OTDR 151
Clearing Traces from the Display
To set automatic clearing of the trace display:
1. From the main window, press the Setup button.
2. From the Setup dialog box, select the Acquisition tab, then select the
Clear all files other than the reference file when beginning
acquisition sequence box.
3. Press Apply to confirm the changes, then OK to return to the main
window.
Once you launch your test, the files will be automatically closed. If you
had already acquired or modified (but not stored) some traces, a
warning message appears for each trace (even if the trace is hidden)
asking you if you want to save it or not.
The same principle will apply if you retest some channels (see To set
the channel configuration: on page 88).