Keysight U1271A, Service Manual

Page: 38 / 63

1 Calibration Procedures
38 Keysight 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”.
Shift
View
Esc
Auto
Trig
Hold
Auto
Trig
Hold
Shift
View
Esc
Peak
MaxMin
Auto
Range
Exit
Dual
Setup
Hz % ms
Log