ADE7758 Analog Devices, ADE7758 Datasheet - Page 42

• Manufacturer Part Number: ADE7758
• Description: Poly Phase Multifunction Energy Metering IC with Per Phase Information
• Manufacturer: Analog Devices

ADE7758
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
END
YES
WATT OFFSET
ALL PH
CAL?
SET UP PULSE
WATT OFFSET
OUTPUT FOR
CALIBRATE
A, B, AND C
NO
@ I
YES
MIN
ALL PH VAR
OFFSET
CAL?
SET UP PULSE
OUTPUT FOR
VAR OFFSET
CALIBRATE
A, B, AND C
Figure 76. Calibration Using Pulse Output
NO
@ I
YES
MIN
Rev. A | Page 42 of 68
PH CAL?
PHASES
ALL
START
SET UP PULSE
OUTPUT FOR
CALIBRATE
A, B, OR C
@ PF = 0.5
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.
NO
PHASE
YES
GAIN CAL
PHASES
VAR?
ALL
SET UP FOR
CALIBRATE
A, B, OR C
NO
VAR GAIN
@ PF = 0
PHASE
YES
CALIBRATE VRMS
CALIBRATE IRMS
VA AND WATT
GAIN CAL?
PHASES
OFFSET
OFFSET
ALL
HAVE SEPARATE PULSE OUTPUTS
PF = 1 BECAUSE THEY
CAN BE CALIBRATED
SIMUTANEOUSLY @
SET UP PULSE
GAIN @ PF = 1
WATT AND VA
OUTPUT FOR
WATT AND VA
CALIBRATE
A, B, OR C
NO
MUST BE DONE
BEFORE VA GAIN
CALIBRATION