Datasheet

90E36A POLY-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
Electrical Specification 63 April 2, 2013
7.2 METERING/ MEASUREMENT ACCURACY
7.2.1 METERING ACCURACY
Metering accuracy or energy accuracy is calculated with relative
error:
Where E
mea
is the energy measured by the meter, E
real
is the actual
energy measured by a high accurate normative meter.
%100×
−
=
real
realmea
E
EE
γ
Table-14 Metering Accuracy for Different Energy within the Dynamic Range
Energy Type Energy Pulse
ADC Range
When Gain=1 Metering Accuracy
note 1
Active energy
(Per phase and all-phase-sum)
CF1
PF=1.0 120μV-720mV
0.1%PF=0.5L, 180μV-720mV
PF=0.8C, 150μV-720mV
Reactive energy
(Per phase and all-phase-sum)
CF2
sinФ=1.0 120μV-720mV
0.2%sinФ=0.5L, 180μV-720mV
sinФ=0.8C, 150μV-720mV
Apparent energy
(Per phase and arithmetic all-phase-sum)
CF2
600μV-720mV
note 2
0.2%
Apparent energy
(Vector sum)
CF2 120μV-720mV 0.5%
Fundamental active energy
(Per phase and all-phase-sum)
CF3
PF=1.0 120μV-720mV
0.2%PF=0.5L, 180μV-720mV
PF=0.8C, 150μV-720mV
Harmonic active energy
(Per phase and all-phase-sum)
CF4
PF=1.0 120μV-720mV
0.5%PF=0.5L, 180μV-720mV
PF=0.8C, 150μV-720mV
Note 1: All the parameters in this table is tested on Atmel’s test platform.
Note 2: Apparent energy is tested using active energy with unity power factor since there’s no standard for apparent energy. Signal below 600 μV is not tested.