-50- 
 
No.PS※※-OMM0007-H 
 
 
<Operation - With security code input- > 
Locking 
1, Press the   button for 5 seconds or longer in measurement mode. 
The current setting "UnL" is displayed. 
 
 
 
2, Press the   or   button to select keys lock "LoC". 
 
 
 
3, Press the   button to store the setting. 
 
 
Unlocking 
1, Press the   button for 5 seconds or longer in measurement mode. 
The current setting "LoC" is displayed. 
 
 
 
2, Press the   or   button to select keys unlock "UnL". 
 
 
 
3, When the   button is pressed, input of the security code will be requested. 
For how to enter the security code, refer to "How to enter the security code" on page 51. 
 
 
 
4, If the security code entered is correct, the display will change to "UnL". Press any of the  ,   or   
buttons to release the key lock and return to measurement mode. 
If the security code entered is incorrect, “FAL” will be displayed and the security code must be entered 
again. If an incorrect security code is entered three times, "LoC" is displayed and the display will return 
to measurement mode.