Keysight Technologies 3458A Guide D'utilisation page 53

Getting Started 2
changes the range. To go to a lower range, press:
By repeatedly pressing the down arrow key, you can decrement down to the
lowest range. When you reach the lowest range, pressing the down arrow key no
longer changes the range. To return to autoranging, press:
Auto
Self-test
When you applied power to the multimeter, it automatically performed a limited
power-on self-test. Before you start making measurements, however, you may
want to have more confidence that the multimeter is fully operational. This is the
job of the self-test. The self-test performs a series of tests that check the
multimeter's operability and accuracy.
Always disconnect any input signals before you run self-test. If you leave an
NOTE
input signal connected to the multimeter, it cause a self-test failure.
The self-test takes over 50 seconds. To run self-test press:
Test
If the self-test passed, the display shows:
When self-test passes, you have a high confidence that the multimeter is
operational and, assuming proper calibration and autocalibration, that
measurements will be accurate.
Keysight 3458A User's Guide 53