ADE7758_15 datasheet(43/72 Pages) AD

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Data Sheet

ADE7758

Rev. E | Page 43 of 72

START

CALIBRATE IRMS

OFFSET

CALIBRATE VRMS

OFFSET

MUST BE DONE

BEFORE VA GAIN

CALIBRATION

WATT AND VA

CAN BE CALIBRATED

SIMULTANEOUSLY @

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 @ ITEST,

PF = 1

ALL

PHASES

GAIN CAL

VAR?

YES

SET UP FOR

PHASE

A, B, OR C

CALIBRATE

VAR GAIN

@ ITEST, PF = 0,

INDUCTIVE

ALL

PHASES

PHASE ERROR

CAL?

YES

SET UP PULSE

OUTPUT FOR

A, B, OR C

CALIBRATE

PHASE @ ITEST,

PF = 0.5,

INDUCTIVE

ALL PHASES

VAR OFFSET

CAL?

YES

SET UP PULSE

OUTPUT FOR

A, B, OR C

CALIBRATE

VAR OFFSET

@ IMIN, PF = 0,

INDUCTIVE

ALL PHASES

WATT OFFSET

CAL?

YES

SET UP PULSE

OUTPUT FOR

A, B, OR C

CALIBRATE

WATT OFFSET

@ IMIN, PF = 1

END

Figure 77. 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 APCFNUM (0x45), APCFDEN

(0x46), and xWG (0x2A to 0x2C). Equation 50 through

Equation 52 show how these registers affect the Wh/LSB

constant and the APCF pulses.

For calibrating VAR gain, the registers in Equation 50 through

Equation 52 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 78 shows the steps for gain calibration of watts, VA, or

VAR using the pulse outputs.

ADE7758 Datasheet(PDF) 43 Page - Analog Devices

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