SA4106A
TERMINOLOGY
Anti-Creep Threshold
Limit Range of Operation*
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 LED or motor drive outputs.
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
Positive energy is defined when the phase difference
between the input signals IIP and IVP is less than 90 degrees
(-90..90 degrees).
Maximum Rated Mains Current (IMAX
)
Maximum rated mains current is the specified maximum
current flowing through the energy meter at 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).
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).
Percentage Error*
Percentage error is given by the following formula:
퐸푛푒푟푔푦 푟푒푔ꢀ푠푡푒푟푒푑 − 푇푟푢푒 퐸푛푒푟푔푦
Nominal Mains Voltage (VNOM
Nominal mains voltage (VNOM) is the voltage specified for the
energy meter at rated operating conditions.
)
%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.
Maximum Output Frequency (FMAX
)
The maximum output frequency (FMAX) is the output
frequency in FAST mode when 16µARMS input current with
zero phase shift are applied to the voltage and current inputs.
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 each channel is
therefore defined to be 16µARMS, which leaves about 10%
headroom to the saturation point. In FAST mode the nominal
maximum output frequency of 5kHz is achieved under such
conditions.
Rated Operating Conditions*
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.
Specified Measuring Range*
Set of values of a measured quantity for which the error of a
meter is intended to lie within specified limits.
Repeatability of Error Test**
This test shall be carried out at 0.05Ib and Ib at UPF load
under reference test conditions. Twenty error samples shall
be taken at time intervals of 30 minutes. Identical test
conditions shall be maintained throughout the test. For an
acceptance test six error tests may be carried out at time
intervals of at least 5 minutes.
Specified Operating Range*
A range of values of a single influence quantity, which forms
a part of the rated operating conditions.
* IEC 62052-11, 2003. Electricity Metering Equipment (AC) – General Requirements, Test and Test Conditions
– Part 11: Metering Equipment
** IS13779-1999 Indian Standard AC Static Watt-hour Meters Class 1 and 2 Specification Rev 1
SPEC-1587 (REV. 5)
29-09-2017
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SAMES [ SAMES ]
