104 Agilent U1251B/U1252B User’s and Service Guide
5 Maintenance
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%.
Tab l e 5-1 Battery voltage and corresponding percentage of charges in standby and charging modes
Condition Battery voltage Proportional percentage
Trickle (SBY) 6.0 V to 8.2 V 0% to 100%
Charging 7.2 V to 10.0 V 0% to 100%
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