Rice Lake FX-i WP Series, A&D Weighing - Manual (Page 51)

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Quitting the operation
8 The balance displays the next menu of the function table.
Press the CAL key to exit the clock and calendar function
and return to the weighing mode.
Notes
Do not enter invalid values such as a non-existing date when setting the time and date.
When the clock backup battery has been depleted, the balance displays rtc pf . Under
this condition, press any key and set the time and date. The dead battery only affects the
clock and calendar function. Even so, the function works normally as long as the AC adapter
is connected to the balance.