IET Labs DE-5000, Руководство пользователя и обслуживания

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When the meter is powered by the battery, it is in an
automatic-power-off mode.
APO
is shown on the display. In this
mode, if the unit is inactive for 5 minutes, it shuts itself off. First,
the buzzer beeps three times to remind the user, then
OFF
is
displayed on the monitor as shown below while the unit powers
down.
Note that when the unit is powered via an ac adapter, the
automatic-power-off mode is inactive.
The default settings for the meter set LCR in auto mode and test
frequency at 1 kHz.
The battery condition is continuously displayed. means that
the battery capacity is full. means that battery power is low
and the battery needs to be replaced.
The LCR meter uses beeps to indicate whether a particular key has a
function in a given mode. If a functional key is pressed, there is a
single beep. If a non-functional key is pressed, there is a dual beep.