B&K Precision 2640 - Manual - Manual (Page 70)

70
System
There are modes that select the function of Multi key using the Shift
Key and the other functions.
Functions can be selected using the multi key and the Menu.
The functions that can be selected in Menu mode are as blow.
To exit from Menu or System, push the Key or push the Dot key,
this will move you to lower menu items or to higher menu items.