SA4120A
TERMINOLOGY
Anti-Creep Threshold
Specified Operating Range*
The anti-creep threshold is defined as the minimum energy
threshold below which no energy is registered and therefore
no pulses are generated on the pulse output.
A range of values of a single influence quantity, which forms
a part of the rated operating conditions.
Limit Range of Operation*
Positive Energy
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.
Positive energy is defined when the phase difference
between the input signals IIP and IVP is less than 90 degrees
(-90..90 degrees).
Negative Energy
Maximum Rated Mains Current (IMAX
)
Negative energy is defined when the phase difference
between the input signals IIP and IVP is greater than 90
degrees (90..270 degrees).
Maximum rated mains current is the specified maximum
current flowing through the energy meter at rated operating
conditions.
Percentage Error*
Percentage error is given by the following formula:
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).
퐸푛푒푟푔푦 푟푒푔푖푠푡푒푟푒푑 − 푇푟푢푒 퐸푛푒푟푔푦
%퐸푟푟표푟 =
× 100
푇푟푢푒 퐸푛푒푟푔푦
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.
Nominal Mains Voltage (VNOM
)
Nominal mains voltage (VNOM) is the voltage specified for the
energy meter at rated operating conditions.
Rated Operating Conditions*
Maximum Output Frequency (FMAX
)
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.
The maximum output frequency (FMAX) is the output
frequency when 14μARMS and 16μARMS input current with
zero phase shift are applied to the voltage and current inputs
respectively. Both the voltage and current inputs saturate at
an input current magnitude of 25μA, or at 17.68μARMS when
using sine waves. The maximum input current on any
channel is therefore defined to be 16μARMS, which leaves
about 10% headroom to the saturation point. An additional
headroom of 15% is reserved on the voltage channel to
account for mains voltage fluctuations. The nominal output
frequency of 1160Hz is achieved under such conditions.
Specified Measuring Range*
Set of values of a measured quantity for which the error of a
meter is intended to lie within specified limits.
* IEC 62052-11, 2003. Electricity Metering Equipment (AC) – General Requirements, Test and Test Conditions
– Part 11: Metering Equipment
SPEC-3094 (REV. 2)
29-09-2017
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