Vaisala MMT330 - Manual (Page 113)

Chapter 4 _________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 113
Deleting the Recorded Files
You can delete the recorded data files using the keypad/display, or the
DELETE command on the serial line. The deletion is always done for all
data; you cannot delete individual files.
Note that the transmitter automatically overwrites the old data when the
memory is full, so manual deletion of the recorded files is not necessary
in normal use.
To delete the data files using the keypad/display:
1. Press any of the arrow buttons to open the Main Menu.
2. Select System
by pressing the ► arrow button.
3. Select Clear graph memories by pressing the CLEAR button.
Press the YES button to confirm the selection.
CAUTION This function clears the entire data history of the transmitter, including
all graphs and the content of the optional data logger module.
UNDELETE
Similarly to the DELETE command, the UNDELETE command is used
without any arguments. It will recover all deleted data that has not been
overwritten yet.