7451A/7461A/7461P Digital Multimeter Operation Manual
5.12.4 Front Panel Disabling Function
5-51
Panel lock setting
Set the panel lock according to the following procedure.
Operation
Character 
display 
section
1.
Press   and select   by using   and  .
MENU
SYS
2.
Press .
SYS
BEEP
3.
Select ‘P.Lock’ by using   and  .
SYS
P. Lo ck
4.
Press .
P. Lo ck
OFF
5.
Select ON by using   and  . and press  .
P. Lo ck
ON
6.
Select the digit in the numerical value entry section by using   
and .
Change the numerical value by using   and   to enter the 
password.
PWD
7.
Press .
If a correct password is entered, LOCK is displayed and exit 
from MENU.
If an incorrect password is entered, the procedure returns to step 
3.
Re-set by using the correct password.
PWD
LOCK