Maintenance 5
Keysight U1251B and U1252B User’s and Service Guide 131
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.
WARNING
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.
CAUTION
– 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.
NOTE
For the battery charger, the mains supply voltage should not fluctuate by plus or
minus 10%.
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