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Glossary-2
Byte: A group of 8 binary digits processed as a unit by a computer (or device) and
used especially to represent an alphanumeric character.
CBEMA Curve: A voltage quality curve established originally by the Computer Business
Equipment Manufacturers Association. The CBEMA Curve defines voltage
disturbances that could cause malfunction or damage in microprocessor devices.
The curve is characterized by voltage magnitude and the duration which the
voltage is outside of tolerance. (See ITIC Curve.)
Channel: The storage of a single value in each interval in a load profile.
Cold Load Pickup: This value is the delay from the time control power is restored to the time when
the user wants to resume demand accumulation.
CRC Field: Cyclic Redundancy Check Field (Modbus communication) is an error checksum
calculation that enables a Slave device to determine if a request packet from a
Master device has been corrupted during transmission. If the calculated value
does not match the value in the request packet, the Slave ignores the request.
CT (Current) Ratio: A Current Transformer Ratio is used to scale the value of the current from a
secondary value up to the primary side of an instrument tranformer.
Cumulative Demand: The sum of the previous billing period maximum demand readings at the time
of billing period reset. The maximum demand for the most recent billing period
is added to the previously accumulated total of the maximum demands.
Demand: The average value of power or a similar quantity over a specified period of
time.
Demand Interval: A specified time over which demand is calculated.
Display: User-configurable visual indication of data in a meter.
DNP 3.0: A robust, non-proprietary protocol based on existing open standards. DNP 3.0
is used to operate between various systems in electric and other utility industries
and SCADA networks. EPM 9450 supports Level 1; EPM 9650 & 9800
support Level 2.
EEPROM: Nonvolatile memory. Electrically Erasable Programmable Read Only Memory
that retains its data during a power outage without need for a battery. Also
refers to meter’s FLASH memory.
Energy Register: Programmable record that monitors any energy quantity. Example: Watthours,
VARhours, VAhours.
Ethernet: A type of LAN network connection that connects two or more devices on a
common communications backbone. An Ethernet LAN consists of at least one
hub device (the network backbone) with multiple devices connected to it in a
star configuration. The most common versions of Ethernet in use are 10BaseT