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6
Test LED
The meter has one pulse LED for active energy with 1000 Imp/kWh.
The ON-time of a pulse is 40 ms.
7
Components
7.1
Block diagram
V
Current measuring:
Voltage measuring:
A/D:
MCU:
Communication interface:
Data storage EV1:
Display EV1:
LED Pulse output:
I
A/D
Input
Manganin shunt
Resistor divider
Analog to digital converter for the sampled voltage and cur-
rent
Micro Controller Unit
RS485-Interface
Nonvolatile storage for energy register +A and meter parame-
ter in EEPROM
LCD with 6 digits
Active energy +A 1000 Imp/kWh
Display
MCU
LED
Pulse
Output
7. Block diagram
EEPROM
RS485 Interface
16 /17
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