Liberty 100 Smart Electricity Meter Technical Reference Manual
b) Price change – the meter takes a billing snapshot before the price change in the meter and then the
meter balance is reset. However, the meter balance will not reset when there is a price change in the
meters operating in Credit mode.
c) Scheduled billing date – the meter takes a billing snapshot on the scheduled billing date. The billing
period can be configured in days, weeks or months. If the meter is in a power off state at the scheduled
billing time then it will take the snapshot when power is resumed, this will not affect the next billing date.
d) On-demand billing – the meter takes a billing snapshot on receipt of a request for an on-demand bill.
The snapshot data recording will depend on the billing reference which can be configured either as
immediate or at midnight. If the billing reference is configured for midnight then the previous midnight
snapshot is taken as the billing snapshot.
e) Change of meter operating mode – a billing snapshot is taken when the meter’s operating mode is
changed from Credit or Prepayment mode to Default mode, a second snapshot is taken after the
change has taken place. Any of the following change of mode is part of a tariff configuration change and
is treated as a change of tariff snapshot:
• Default to Prepayment or Credit
• Credit to Prepayment or
• Prepayment to Credit
f) Change of Supplier – on change of supplier the meter performs a billing action and a billing snapshot is
taken before the change of supplier.
g) Change of Tenancy – on change of tenancy the meter performs a billing action and a billing snapshot is
taken before the change of tenancy.
5.2.4.3 Audit Snapshot
Liberty 100 takes an audit snapshot when any of the following actions are performed:
a) Meter time setting
b) Block reset
c) Over the air (OTA) firmware change. In this case two snapshots are taken, one before and the other
after the firmware change.
The meter stores ten (10) audit snapshots on a FIFO basis.
5.2.4.4 Current Snapshot
The meter will record the current value of its energy registers which is sent to the HES on receipt of a current
snapshot request.
5.3 Metrology LED
Liberty 100 has a metrology LED which is set to flash at a rate proportional to the instantaneous power. Over
time, the number of flashes corresponds to the amount of energy registered by the meter. The metrology LED
emits 3200 flashes for each kWh measured.
The default source energy register for the LED is assigned at manufacture from the list of supported main
energy registers.
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