5 Maintenance
152 Keysight U1253B User’s and Service Guide
Figure 5-3 Self-testing time display
6 After pressing or in the case of a restart, the multimeter will perform a
self-test to check whether the battery inside the multimeter is a rechargeable
battery. This self-test will take 3 minutes. Avoid pressing any of the
push-buttons during the self-test. If there is any error, the multimeter will
display error messages as shown in Table 5-2 on page 153.
Table 5-1 Battery voltage and corresponding percentage of charges in standby and charging
modes
Condition Battery voltage Proportional percentage
Trickle 7.0 V to 9.6 V 0% to 100%
Charging 7.2 V to 10.0 V 0% to 100%