User manual for poly-phase meter
29
14 Back-up power
14.1 Battery
The meter has a 1200mA external changeable lithium battery (optional). When
the meter is power off, the battery supplies for RTC, LCD display.
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
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!
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