1 3458A Calibration Introduction
22 Keysight 3458A Calibration Manual
b Remove the top cover.
i Remove both rear handle brackets with a #2 Pozidrive.
ii Remove the rear bezel by loosening the four #15 TORX screws.
iii With the back of the instrument facing you, remove the #10 TORX screw
securing the top cover to the right side.
iv Remove the top cover.
c Change the position of jumper JM600 on the 03458-66505 assembly, or
option 001 03458-66515 assembly from the left position to the right
position (front of instrument facing you).
d Reconnect the power and turn the instrument on.
e Access the SECURE command (Press the blue SHIFT key then the S MENU
key. Use the
↓ scroll key if in the full command menu to display the
SECURE command).
f Enter the number 0 followed by the delimiter (,) and the security code you
want to use.
g Press the ENTER key.
h Turn the instrument off, disconnect power, and return jumper JM600 to the
left position (front of instrument facing you).
i Replace the top cover and reconnect power. The instrument will now
respond to the new security code you just entered.
When jumper JM600 is in the right position, the security feature is disabled (i.e.
old_code = 0). It is possible to calibrate the instrument without entering a
security number under these conditions. If a new security number (new_code of
SECURE command) is not entered while the jumper is in the right position the
original number will again be in effect when jumper JM600 is returned to the left
position.
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