Maintenance 5
Agilent U1251B/U1252B User’s and Service Guide 103
Charging the battery
A new rechargeable battery comes in a discharged condition
and must be charged before use. Upon initial use (or after a
prolonged storage period), the battery may require three to
four charge/discharge cycles before achieving maximum
capacity. To discharge, simply run the multimeter under the
battery's power until it shuts down or the low battery
warning appears.
Never discharge the battery by shorting it or by reverse polarity in any
subjects. Make sure the battery is the rechargeable type before charging
it. Never rotate the rotary switch when the battery is being charged as DC
at 24 V is being applied to the charging terminals.
• Do not rotate the rotary switch from position when
charging the battery.
• Perform battery charging only with a 9 V Ni-MH rechargeable
battery (7.2 V nominal voltage) or 9 V size Ni-MH rechargeable
battery (8.4 V nominal voltage)
• Disconnect test leads from all the terminals when charging.
• Ensure proper insertion of battery in the multimeter and follow the
correct polarity.
For the battery charger, the mains supply voltage should not fluctuate by
plus or minus 10%.
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