ITRON Centron, Technical Reference Manual

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CENTRON® Meter Technical Reference Guide 83
Alternate Mode
One of the four modes of register operation used to
display quantities that are not needed on a regular
basis, for example Kh.
Annunciator
A Liquid Crystal Display (LCD) label that is
displayed to identify a particular quantity being
displayed.
EEPROM
Electrically Erasable Programmable Read Only
Memory (EEPROM) is a memory chip that can only
be erased by an electrical signal (retains data during a
power outage).
Battery Carryover
The amount of time that the register is energized by
the battery to maintain the accuracy of the clock
within the microprocessor. All program and billing
data are transferred to non-volatile memory when
battery carryover operation is activated.
Baud
Unit of data transmission signalling speed, roughly
analogous to bits per second (bps).
Block Interval Demand
Demand based on intervals from 1 to 60 minutes in
length.
Calendar Schedule
Schedule that determines seasonal changes, Daylight
Saving Time (DST) changes, holidays, daily switch
points, etc.
Coincident Demand
The energy accumulated in an interval where a
second trigger energy attained a peak. For example,
Var demand when Watt demand attained a peak.
Cold Load Pickup (CLPU)
See Demand Delay.
Continuous Cumulative Demand
The sum of the previous billing period maximum
demands and the present period maximum demand.
CT Ratio
The current transformer ratio to use for viewing
current (amperage) quantities for this service point.
Cumulative Demand
The sum of the maximum demand values at each
demand reset since the cumulative register was
cleared. It is updated at each demand reset by adding
the maximum demand register to the cumulative
register.
Current Season
The season that defines the present rate schedule.
Daylight Saving Time (DST)
Daylight Saving Time (DST) begins for most of the
United States at 2:00 a.m. on the first Sunday of
April. Time reverts to standard time at 2:00 a.m. on
the last Sunday of October. In the U.S., each time
zone switches at a different time.
Beginning in 2007, DST will begin on the second
Sunday of March and end the first Sunday of
November. The Secretary of Energy will report the
impact of this change to Congress. Congress retains
the right to revert the Daylight Saving Time back to
the 2005 time schedule once the Department of
Energy study is complete.
Demand
The average value of power over a specified interval
of time. Demand is expressed in kilowatts,
kilovoltamperes, kilovars, or other suitable units. An
interval may be 1, 5, 10, 15, 30, or 60 minutes.
Glossary of Terms