Performance Tests and Calibration 4
34405A User’s and Service Guide 89
Example 3
Assume the calibration security code has been set to ATB1 
through remote interface. The first two characters (AT) are 
ignored. The B is represented by a zero. The “1” is still used 
and trailing zeros fill in the remaining characters. Use this 
code to unsecure:
01000
To Unsecure the Instrument from the Front Panel
1 Press  and  simultaneously to enter the 
Calibration Security Code entry mode.
2 The primary display shows SECur  and the secondary 
display shows _ _ _ _ _.
3 Use the editing keys   to step to each 
character
in the code. 
Use the range keys  to select each character. 
4 Press     (Enter) when done.
5 If the correct security code was entered, the CAL 
annunciator illuminates and the primary display briefly 
shows  PASS. 
Shift
DCV
Store
Recall
Store
Recall
Limit
Edit
Range
Disp
Enter
34405A users guide.book  Page 89  Saturday, September 2, 2006  3:38 PM