SA9903B
TERMINOLOGY
Positive Energy
Limit Range of Operation*
Positive energy is defined when the phase difference
between the input signals IIP and IVP is less than 90 degrees
(-90..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
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*
Constant*
Percentage error is given by the following formula:
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*
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.
Maximum Energy (FMAX
)
The maximum energy is defined as the energy registered on
the active register of the SA9903B 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 320000 counts
per second 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.
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
SPEC-0051 (REV. 5)
29-09-2017
5/17
SAMES [ SAMES ]
