Keysight U1253B Guía Del Usuario Y Servicios página 181

6 Performance Tests and Calibration
Calibration Security
A calibration security code is in place to prevent accidental or unauthorized
adjustments to the U1253B true RMS OLED multimeter. When you first receive
your instrument, it is secured. Before you can adjust the instrument, you must
"unsecure" it by entering the correct security code (see the section
the instrument for calibration"
The security code is set as 1234 when the instrument is shipped from the factory.
The security code is stored in nonvolatile memory, which does not change even
when the power is off.
You can unsecure the instrument and then change the security code from the
NOTE
front panel.
See the section
you forget your security code.
Unsecuring the instrument for calibration
Before you can adjust the instrument, you must unsecure it by entering the
correct security code from the front panel.
The default security code is 1234.
From front panel
1 Turn the rotary switch to the
2 Press
3 The secondary display will indicate "CSC:I 5555", where the character "I"
4 Press
180
"Resetting the security code to factory default"
rotary switch position; but here we assume that you will follow the exact steps
listed in Table 6-2).
and
entry mode.
signifies "input".
or to start entering the code (by editing the existing number
"5555" one digit at a time).
on page 180).
position (you may also start with another
simultaneously to enter the Calibration Security Code
Keysight U1253B User's and Service Guide
"Unsecuring
on page 185 if