Hioki 3284 HiTester, Инструкция по эксплуатации

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Chapter 5 AC Adapter (Optional)
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NOTE
All the phenomena are likely to happen, in the case
the battery voltage is lower than AC adapter voltage
(typ. 9 V) . It is recommended that a new battery
should be used, when the blackout seems to be
short.
･
The battery will be preferred as the power source
when the battery voltage is higher than the voltage
that supplied by the AC adapter (typically the case
with a brand-new battery). When battery voltage
dips below the AC adapter, the source automatically
switches over to the AC adapter.
･
The remaining battery charge (indicated by the bar
graph), when used with the AC adapter, is based on
the AC adapter voltage. It is not a display for
battery life in this case.