5
1.3. Abbreviations
AC Alternating current M Mega (10
6
)
ANSI American national standards
institute
Max Maximum
CE European conformity (logo) MDI Maximum demand indicator
Cosem Companion specification for energy
metering
MID Measurement instruments directive (European
Union)
CT Current transformer Min Minimum
DC Direct current mm Millimetres
DLMS Device language message
specification
Nom Nominal
DST Daylight savings time NVM Non-volatile memory
EOB End of billing OBIS Object identification system
EOI End of integration PF Power factor
EMC Electro-magnetic compatibility PSTN Packet switching telephone network
G Giga (10
9
) PSU Power supply unit
GSM Global system for mobile
communications
RF Radio frequency
GPRS General packet radio service RH Relative humidity
HHT Hand-held terminal RMS Root mean square
HF High frequency RTC Real-time clock
Hz Hertz RWP Read without power
I Current SAP Service access point (Cosem)
i.a.w In accordance with SCADA Supervisory control and data acquisition
Ib Base current secs Seconds
I/O Inputs and outputs T Tera (10
12
)
IR Infrared TER Total energy register
IEC International electrotechnical
commission
THD Total harmonic distortion
k Kilo (10
3
) TOU Time of use
LAN Local area network V Volt
LCD Liquid crystal display VT Voltage transformer
LED Light emitting diode WEEE Waste electrical and electronic equipment
directive (European Union)
LP Load profile W Watt
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