SA2102D
sames
TERMINOLOGY
Rated Operating Conditions*
Bi-directional and Uni-directional measurement
In the bi-directional configuration the LED, MON and MOP
outputs generate pulses at a frequency that is proportional to
the energy measured in both forward and reverse directions.
Set of specified measuring ranges for performance
characteristics and specified operating ranges for influence
quantities, within which the variations or operating errors of a
meter are specified and determined.
In the uni-directional configuration the LED, MOP and MON
outputs generate pulses at a frequency that is proportional to
the energy measured only if the energy flow is in the same
direction as selected by the DIRI pin. No output pulses are
generated for energy flowing counter to the DIRI pin selection.
The DIRI pin can select either positive or negative energy flow.
Specified Measuring Range*
Set of values of a measured quantity for which the error of a
meter is intended to lie within specified limits.
Specified Operating Range*
Range of values of a single influence quantity, which forms a
part of the rated operating conditions.
Positive energy
Positive energy is defined when the phase difference between
Limit range of operation*
the input signals IIP and IVP are less than 90 Degrees.
Extreme conditions which an operating meter can withstand
without damage and without degradation of its metrological
characteristics when it is subsequently operated under its rated
operating conditions.
Negative energy
Negative energy is defined when the phase difference
between the input signals IIP and IVP is greater than 90
degrees (90..270 degrees).
Nominal Mains Voltage (VNOM)
Nominal Mains Voltage (VNOM ) is the voltage specified for the
Percentage error*
Percentage error is given by the following formula:
energy meter at Rated Operating Conditions.
Maximum Rated Mains Current (IMAX)
Maximum Rated Mains Current is the current flowing through
Energy registered by SA2102D - True energy
%Error =
X 100
the energy meter at Rated Operating Conditions.
True energy
Constant*
Value expressing the relation between the active energy
registered by the meter and the corresponding value of the test
output. If this value is a number of pulses, the constant should
be either pulses per kilowatt-hour (imp/kWh) or watt-hours per
pulse (Wh/imp).
NOTE Since the true value cannot be determined, it is approximated
by a value with a stated uncertainty that can be traced to standards
agreed upon between manufacturer and user or to national standards.
*IEC 61036, 2000. Alternating Current Static Watt-hour Meters for Active Energy. Edition 2.1
5/16
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