ATM90E32AS-AU-R datasheet(75/84 Pages) ATMEL

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M90E32AS [DATASHEET]

Atmel-46003B-SE-M90E32AS-Datasheet_02122015

6.2.2

MEASUREMENT ACCURACY

The measurements are all calculated with fiducial error except for frequency.

Fiducial error is calculated as follows:

Where Umea means the measured data of one measurement parameter, and Ureal means the real/actual data of the

parameter,

UFV 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

Table-17 Measurement Parameter Range and Format

Measurement

Fiducial Value (FV)

M90E32AS

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 recom-

mended)

XX.XXX

0 ~ 65.535A

Unsigned integer with unit of 0.001A

Voltage rms

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 Fre-

quency 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.

100%

rror

Fiducial_E

real

mea

ATM90E32AS-AU-R Datasheet(PDF) 75 Page - ATMEL Corporation

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