Performance Tests and Calibration 7
Agilent U1251A/U1252A User’s and Service Guide 139
Unsecuring the Instrument for Calibration
Before you can adjust the instrument, you must unsecure it
by entering the correct security code. The security code is
set to 1234 when the instrument is shipped from the fac-
tory. The security code is stored in non- volatile memory,
and does not change when power is off.
To Un secu re t he I nstr ume nt from the Front Panel
11 Turn the rotary switch to .
12 Press and button simultaneously to enter
the Calibration Security Code entry mode.
13 The primary display shows 5555 and the secondary
display show SECUr.
14 Use the editing keys and to step each
character in the code.
Use the and to select each character.
15 Press (Save) when done.
16 If the correct security code is entered, the secondary
display will show PASS.
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