User manual for single-phase meter
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14 Back-up power
14.1 Battery
The meter has a 1200mA internal lithium battery or 1200mA external replacement lithium
battery(optional). When the meter is power off, the battery supplies for RTC, LCD display and event
will be recorded.
14.1.1 Low battery detection
When the meter is power on, the voltage will be measured by AD sampling per second.
The accuracy of voltage measuring is ±0.1V.
When the battery has been detected under low voltage (less than 3.0V) for 10 continual
seconds, a low battery sign can be displayed on LCD, to remind customer to change the battery.
14.1.2 Battery working lifetime
Average working current
Meter power on I<1µA
Meter power off 15µA<I<30µA
Working lifetime
The battery can be used at least 10 years.
When the meter powers off, the lifetime of battery can be at least 2 years.
14.1.3 External battery replacement(optional)
1) Power off the meter.
Customer should replace battery after powering off the meter. If it is inevitable to replace
battery when powering on, please be even more careful for replacement operation to avoid
electrical shock accidentally!
Before battery replacement, must power off the meter first, otherwise
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