Keysight U1251B Guia Del Usuario página 139

Maintenance 5
Applicable for U1252B with Firmware version 3.01 and above.
NOTE
In order to comply with US DOE & CA CEC regulation enforced on January 1,
2017, the trickle charge feature as described in step 7 has been disabled. Once
the charging is completed, the display will be cleared and multimeter will enter
sleep mode.
Press SHIFT to re-initiate the charging cycle from sleep mode.
Keysight U1251B and U1252B User's and Service Guide 137