ADE7758ARWZRL【PDF 47/72 页】IC ENERGY METERING 3PHASE 24SOIC

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Data Sheet

START

STEP 1

ENABLE CF

OUTPUTS

STEP 2

CLEAR OFFSET

REGISTERS

xWATTOS, xVAROS

ADE7758

YES

ALL PHASES

WATT OFFSET

CALIBRATED?

NO

STEP 3

SET UP APCF

PULSE OUTPUT

FOR PHASE A, B,

OR C

END

YES

ALL PHASES

VAR OFFSET

CALIBRATED?

NO

STEP 3

SET UP VARCF

PULSE OUTPUT

FOR PHASE A, B,

OR C

SELECT PHASE

FOR LINE PERIOD

MEASUREMENT

STEP 4

SET UP SYSTEM

FOR I MIN , V NOM ,

PF = 1

STEP 5

MEASURE %

ERROR FOR

APCF

STEP 6

CALCULATE AND

WRITE TO

xWATTOS

CONFIGURE

FREQ[11:0] FOR A

LINE PERIOD

MEASUREMENT

STEP 7.

REPEAT STEP

3 TO STEP 6

FOR xVAROS

STEP 4

SET UP SYSTEM

FOR I MIN , V NOM ,

PF = 0, INDUCTIVE

STEP 5

MEASURE %

ERROR FOR VARCF

MEASURE PERIOD

USING FREQ[11:0]

REGISTER

STEP 6

CALCULATE AND

WRITE TO

xVAROS

Figure 80. Offset Calibration Using Pulse Output

Step 1: Repeat Step 1 and Step 3 from the gain calibration to

configure the ADE7758 pulse output.

Step 2: Clear the xWATTOS and xVAROS registers.

Step3: Disable the Phase B and Phase C contribution to the APCF

and VARCF pulses. This is done by the TERMSEL[2:4] bits of

the COMPMODE register (0x16). Setting Bit 2 to Logic 1 and

Bit 3 and Bit 4 to Logic 0 allows only Phase A to be included in

the pulse outputs. Select Phase A, Phase B, or Phase C for a line

Step 4: Set the test system for I MIN , V NOM , and unity power factor.

For Step 6, set the test system for I MIN , V NOM , and zero-power

factor inductive.

Step 5: Measure the percent error in the pulse output, APCF or

VARCF, from the reference meter using Equation 49.

Step 6: Calculate xWATTOS using Equation 56 (for xVAROS

use Equation 57).

xWATTOS =

? %APCF ERROR

?

? 2

× APCF EXPECTED ? × ×

period measurement with the FREQSEL[1:0] bits in the MMODE

register (0x14). For example, clearing Bit 1 and Bit 0 selects

Phase A for line period measurement.

– ?

100 %

? Q

4

APCFDEN

APCFNUM

(56)

Rev. E | Page 47 of 72

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