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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
MCU
Display
EEPROM
RS485 Interface
LED
Pulse
Output
P
ow
er
C
ur
re
n
t a
nd
vo
lta
ge
sa
m
p
lin
g
A/D
Input
I
V
7. Block diagram
Current measuring:
Manganin shunt
Voltage measuring:
Resistor divider
A/D:
Analog to digital converter for the sampled voltage and cur-
rent
MCU:
Micro Controller Unit
Communication interface:
RS485-Interface
Data storage EV1:
Nonvolatile storage for energy reA and meter parame-
ter in EEPROM
Display EV1:
LCD with 6 digits
LED Pulse output:
Active A 1000 Imp/kWh