sames

SA2102D

5/16

http://www.sames.co.za

TERMINOLOGY

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.

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.

Positive energy is defined when the phase difference between

the input signals IIP and IVP are less than 90 Degrees.

Percentage error is given by the following formula:

Positive energy

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*

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*

Specified Measuring Range*

Specified Operating Range*

Limit range of operation*

Maximum Rated Mains Current (I

)

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.

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).

Set of values of a measured quantity for which the error of a

meter is intended to lie within specified limits.

Range of values of a single influence quantity, which forms a

part of the rated operating conditions.

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.

Nominal Mains Voltage (V

) is the voltage specified for the

energy meter at Rated Operating Conditions.

Maximum Rated Mains Current is the current flowing through

the energy meter at Rated Operating Conditions.

Nominal Mains Voltage (V

)

NOM

NOM

MAX

Constant*

%Error =

Energy registered by SA2102D - True energy

True energy

X 100

*IEC 61036, 2000. Alternating Current Static Watt-hour Meters for Active Energy. Edition 2.1