4.  Over-temperature Protection Setting 
Press  O.T.P  to  enter  the  over-temperature  protection  setting  interface.  The 
over-temperature protection includes two grades. Users can turn ON or OFF the 
first-grade  protection.  A  mark    will  appear  at  the  Status  Bar  when  the 
protection is turned on, see as follow:   
 
Figure 2-28 Over-temperature Protection Settings 
The second-grade protection is a mandatory protection which is always on. 
 
5.  Beeper Setting 
Press Beeper to enter into setting interface. A sign    would shown at Status 
Bar  once  you  turn  on  beeper,  which  indicates  that  the  instrument  may  buzzed 
once pop up a hint message or some button is pressed down.   
 
Figure 2-29 Beeper settings