SPEC-1081 (REV. 2)

5/15

29-09-2017

SA4101A

TERMINOLOGY

Bidirectional and Unidirectional Measurement

In the bidirectional 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.

In the unidirectional configuration the LED, MON and MOP

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.

Anti-Creep Threshold

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.

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).

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).

Percentage Error*

Percentage error is given by the following formula:

%�������������������� =

������������������������ ���������������������������������������� − ���������������� ������������������������

���������������� ������������������������

× 100

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.

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.

Specified Operating Range*

A range of values of a single influence quantity, which forms

a part of the rated operating conditions.

Limit Range of Operation*

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.

Maximum rated mains current is the specified maximum

current flowing through the energy meter at rated operating

conditions.

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).

energy meter at rated operating conditions.

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

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. In FAST

mode the nominal maximum output frequency of 1160Hz is

achieved under such conditions.

* IEC 62052-11, 2003. Electricity Metering Equipment (AC)

– General Requirements, Test and Test Conditions

– Part 11: Metering Equipment