5 Maintenance
132 Keysight U1251B and U1252B User’s and Service Guide
Use the specified 24 V DC adaptor to charge the battery. Remember never to turn
the rotary switch of the meter when its battery is being charged. Use the following
steps to charge the battery:
1 Disconnect the test leads from the meter.
2 Turn the rotary switch to the position. Connect the power cord to the
DC adapter.
3 Plug the Red (+)/ Black (–) banana terminals of the DC adapter to the
and the “COM” terminals respectively. The DC adaptor can be replaced with a
DC power supply in order to set the 24 V DC output and the over current
limitation to a value more than 0.5 A. Ensure that the polarity of the connection
is correct.
4 The primary display will show “bAt” and the ‘SbY” will be shown on the
secondary display and a short beep will sound to remind you whether you
need to charge the battery. Press SHIFT to start charging the battery, or the
meter will automatically start the self-test after the 24 V supply is applied. It is
recommended that you do not charge if the battery’s capacity is over 90%.
Table 5-1 Battery voltage and corresponding percentage of charges in standby and charging
modes
Condition Battery voltage Proportional percentage
Trickle (SBY) 7.0 V to 9.6 V 0% to 100%
Charging 7.2 V to 10.0 V 0% to 100%
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