User manual

1 Calibration Procedures
Unsecuring the Instrument for Calibration
22 U1271A/U1272A Service Guide
1 Before you begin, note down the last four digits of the
multimeter's serial number (located at the bottom of the
multimeter’s rear panel).
2 Power- on the multimeter and press the and
keys simultaneously for more that 1 second to enter the
calibration security code entry mode.
3 is shown in the secondary display while the
security code is shown in the primary display.
4 Press for more than 1 second to enter the
calibration security code reset mode. The secondary
display shows .
Figure 1-7 SEr.no display
5 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.
6 Press to confirm the entry.
7 If the four digits entered are correct, the secondary
display will show . The calibration security code is
now set to the its factory default code, 1234.
If you want to enter a new security code, see “To change the
calibration security code” on page 20. Ensure that you
record down the new security code.
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