Technical data

1 Calibration Procedures
Unsecuring the Instrument for Calibration
40 U1270 Series Service Guide
To reset the calibration security code to its factory default
If you have forgotten the correct calibration security code,
you may follow the steps below to reset the calibration
security code to the factory default code (1234).
1 Before you begin, note down the last four digits of the
instrument's serial number (located at the bottom of the
rear panel).
2 Power- on the instrument and press the and
keys simultaneously for more than 1 second.
The calibration security code entry is shown on the
display.
3 Press (for U1273A/U1273AX) or (for
U1271A/U1272A) for more than 1 second.
Figure 1-7 Resetting the calibration security code
4 Set the code to the same as the last four digits of the
instrument’s serial number.
• Press or to move the cursor to the right or
to the left.
• Press or to increment or decrement the digit.
5 Press to confirm the entry.
NOTE
If you do not have a record (or have lost the record) of the security code,
first try the factory default code, “1234”.
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