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Glossary-3
and 100BaseT as defined in IEEE 802.3 standards. However, several other
versions of Ethernet are also available.
Exception Response: Error Code (Modbus communication) transmitted in a packet from the Slave to
the Master if the Slave has encountered an invalid command or other problem.
Flicker: Flicker is the sensation that is experienced by the human visual system when it
is subjected to changes occurring in the illumination intensity of light sources.
IEC 61000-4-15 and former IEC 868 describe the methods used to determine
flicker severity.
Form: Wiring and Hookup configuration for the EPM 9800.
Harmonics: Measuring values of the fundamental current and voltage and percent of the
fundamental.
Heartbeat Pulse: Energy indicator on the face of the EPM9450/9650; pulses are generated per
the programmed K
e
value.
I
2
T Threshold: Data will not accumulate until current reaches programmed level.
Infrared Test Pulse: Energy indicator located on the upper left side of the face of the EPM 9800
meter; pulses are generated per the programmed K
e
value.
Integer: Any of the natural numbers, the negatives of those numbers or zero.
Internal Modem: An optional modem within the meter’s enclosure that connects to the RJ-11
telephone connector.
Invalid Register: In the meter’s Modbus Map there are gaps between Registers. For example, the
next Register after 08320 is 34817. Any unmapped Register stores no
information and is said to be invalid.
ITIC Curve: An updated version of the CBEMA Curve that reflects further study into the
performance of microprocessor devices. The curve consists of a series of steps
but still defines combinations of voltage magnitude and duration that will cause
malfunction or damage.
K
e
: kWh per pulse; i.e. the energy.
kWh: kilowatt hours; kW x demand interval in hours.
KYZ Output: Output where the rate of changes between 1 and 0 reflects the magnitude of a
metered quantity.
LCD: Liquid Crystal Display.
LED: Light Emitting Diode.