ADE7763ARS datasheet(42/56 Pages) AD

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ADE7763

Rev. A | Page 42 of 56

IRMS

SET INTERRUPT ENABLE FOR ZERO

IRMSOS =

IRMS

−

32768

(63)

whe

and IRMS2 are rms regis r values without offset

correction for input I1 and I2, respectively.

App

Apparent energy gain calibration is provided for both meter-to-

g the VAh/LSB constant.

VAENERGY =

CROSSING ADDR. 0x0A = 0x0010

RESET THE INTERRUPT STATUS

READ REGISTER ADDR. 0x0C

re IRMS1

INTERRUPT?

YES

READ VRMS OR IRMS

ADDR. 0x17; 0x16

RESET THE INTERRUPT STATUS

READ REGISTER ADDR. 0x0C

Figure 77. Synchronizing VRMS and IRMS Readings with Zero Crossings

Voltage rms compensation is done after the square root.

VRMS = VRMS0 + VRMSOS

(60)

where:

VRMS0 is the rms measurement without offset correction.

VRMS is linear from full-scale to full-scale/20.

To calibrate the offset, two VRMS measurements are required,

for example, at Vnominal and Vnominal/10. Vnominal is set at half of the

full-scale analog input range so that the smallest linear VRMS

reading is at Vnominal/10.

VRMSOS =

arent Energy

meter gain adjustment and for settin

⎟

⎠

⎞

⎜

⎝

⎛ +

VAGAIN

VADIV

VAENERGY

initial

(64)

tion. It

used to calibrate individual meters.

App

ion should be performed bef

rms

the most efficient use of the c rent

test points. Apparent energy gain and watt gain compensation

requ

s and watt offset correction equire

a lower test current. Apparent energy gain calibration can be

tt-hour gain calibration

line cycle accumulation apparent energy

registers, are both read following the line cycle accumulation

interrupt. Figure 78 shows a flowchart for calibrating active and

appa

VADIV is similar to the CFDEN for the watt-hour calibra

should be the same across all meters and determines the VAh/LSB

constant. VAGAIN is

arent energy gain calibrat

ore

offset correction to make

ire testing at Ib, while rm

done simultaneously with the wa

using line cycle accumulation. In this case, LAENERGY and

LVAENERGY, the

rent energy simultaneously.

VRMS

−

(61)

where VRMS1 and VRMS2 are rms register values without offset

correction for input V1 and V2, respectively.

If the range of the 12-bit, twos complement VRMSOS register is

not enough, use the voltage channel offset register, CH2OS, to

correct the VRMS offset.

Current rms compensation is performed before the square root:

IRMS2 = IRMS02 + 32768 × IRMSOS

(62)

ut offset correction.

a ula

m full scale to full

ts are required,

at alf of the full-scale

S reading is at

VAGAIN = INT

⎟

⎠

⎞

⎜

⎝

⎛

⎟

⎠

⎞

⎜

⎝

⎛

−

)

(

)

(

nominal

expected

LVAENERGY

(65

LVAENERGY

)

IB(expected)

INT

⎟

⎞

⎜

⎝

⎛

)

(

s/h

3600

time

Accumulati

constant

LSB

VAh

nominal

⎠

according to Equation 34. The VAh represented by the

VAENERGY register is

VAh = VAENERGY × VAh/LSB constant

(67)

The VAh/LSB constant can be verified using this equation:

The accumulation time is determined from Equation 33, and

the line period can be determined from the period register

where IRMS0 is the rms measurement witho

The current rms c lc

tio is linear fro

scale/100.

To calibrate this offset, two IRMS measuremen

for example, at Ib and IMAX/50. IMAX is set

analog input range so that the smallest linear IRM

IMAX/50.

LVAENERGY

time

Accumulati

constant

LSB

VAh

3600

)

(

(68)

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