Monster 659 Owner's Manual page 38

Erase DDA
This function lets you erase the data saved to the DDA data
logger: the data logger must be connected to vehicle wiring.
To erase data, enter the menu page "Erase DDA".
If you press switch (1, fig. 10) in position B "▼" for 3 seconds
and the DDA is not acquiring data, the message "WAIT..." is
shown on the display for 10 seconds. After 10 seconds, the
message "ERASE OK" appears for 3 seconds, to confirm
that the data has been deleted.
If switch (1, fig. 10) is pressed in the B "▼" position for 3
seconds while the DDA data logger is acquiring data, the data
logger memory is not erased and the display shows message
"FAIL" for 3 seconds.
MENU
Press B (for 3 secs.)
YES
DDA=ON
NO
for 10 secs.
for 3 secs.
E
for 3 secs.
fig. 29
37