Datasheet

90E32AS ENHANCED POLY-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
Electrical Specification 74 April 2, 2013
6.2.2 MEASUREMENT ACCURACY
The measurements are all calculated with fiducial error except for
frequency.
Fiducial error is calculated as follows:
Where U
mea
means the measured data of one measurement
parameter, and U
real
means the real/actual data of the parameter,
U
FV
means the fiducial value of this measurement parameter, which
can be defined as Table-17.
For the above mentioned parameters, the measurement accuracy
requirement is 0.5% maximum.
For frequency, temperature,:
Parameter Accuracy
Frequency: 0.01Hz
Temperature: 1 °C
Accuracy of all orders of harmonics: 5% relative error
100%*
U
U-U
rrorFiducial_E
FV
realmea
=
Table-17 Measurement Parameter Range and Format
Measurement Fiducial Value (FV)
90E32AS
Defined
Format Range Comment
Voltage
reference voltage Un
XXX.XX 0 ~ 655.35V Unsigned integer with unit of 0.01V
Current
maximum current Imax
(4×In is recommended)
XX.XXX 0 ~ 65.535A Unsigned integer with unit of 0.001A
Voltage rms Un XXX.XX 0 ~ 655.35V Unsigned integer with unit of 0.01V
Current rms
note 1
Ib/In XX.XXX 0 ~ 65.535A Unsigned integer with unit of 0.001A
Frequency
Reference Frequency 50
Hz
XX.XX 45.00~65.00 Hz Signed integer with unit/LSB of 0.01Hz
Power Factor 1.000 X.XXX -1.000 ~ +1.000 Signed integer, LSB/Unit = 0.001
Phase Angle
note 2
180° XXX.X -180° ~ +180° Signed integer, unit/LSB = 0.1°
Note 1:
All registers are of 16-bit. For cases when the current or active/reactive/apparent power goes beyond the above range, it is suggested to be handled by MCU in
application. For example, register value can be calibrated to 1/2 of the actual value during calibration, then multiply 2 in application.
Note 2:
Phase angle is obtained when voltage/current crosses zero at the sampling frequency of 256kHz.