ADE7758ARWRL datasheet(42/68 Pages) AD

42 / 68 page

ADE7758

Rev. A | Page 42 of 68

START

CALIBRATE IRMS

OFFSET

CALIBRATE VRMS

OFFSET

MUST BE DONE

BEFORE VA GAIN

CALIBRATION

WATT AND VA

CAN BE CALIBRATED

SIMUTANEOUSLY @

PF = 1 BECAUSE THEY

HAVE SEPARATE PULSE OUTPUTS

ALL

PHASES

VA AND WATT

GAIN CAL?

YES

SET UP PULSE

OUTPUT FOR

A, B, OR C

CALIBRATE

WATT AND VA

GAIN @ PF = 1

ALL

PHASES

GAIN CAL

VAR?

YES

SET UP FOR

PHASE

A, B, OR C

CALIBRATE

VAR GAIN

@ PF = 0

ALL

PHASES

PH CAL?

YES

SET UP PULSE

OUTPUT FOR

A, B, OR C

CALIBRATE

PHASE

@ PF = 0.5

ALL PH VAR

OFFSET

CAL?

YES

SET UP PULSE

OUTPUT FOR

A, B, AND C

CALIBRATE

VAR OFFSET

@ IMIN

ALL PH

WATT OFFSET

CAL?

YES

SET UP PULSE

OUTPUT FOR

A, B, AND C

CALIBRATE

WATT OFFSET

@ IMIN

END

Figure 76. Calibration Using Pulse Output

Gain Calibration Using Pulse Output

Gain calibration is used for meter-to-meter gain adjustment,

APCF or VARCF output rate calibration, and determining the

Wh/LSB, VARh/LSB, and VAh/LSB constant. The registers used

for watt gain calibration are CFNUM (0x45), CFDEN (0x46),

and xWG (0x2A to 0x2C). Equations 32 through 34 show how

these registers affect the Wh/LSB constant and the APCF

pulses. For calibrating VAR gain, the registers in Equations 32

through 34 should be replaced by VARCFNUM (0x47),

VARCFDEN (0x48), and xVARG (0x2D to 0x2F). For VAGAIN,

they should be replaced by VARCFNUM (0x47), VARCFDEN

(0x48), and xVAG (0x30 to 0x32).

Figure 77 shows the steps for gain calibration of watts, VA, or

VAR using the pulse outputs.

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