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Data Sheet
Step 4: Set APCFNUM (0x45) and APCFDEN (0x46) to the
calculated value to perform a coarse adjustment on the
imp/kWh ratio. For VAR/VA calibration, set VARCFNUM
(0x47) and VARCFDEN (0x48) to the calculated value.
The pulse output frequency with one phase at full-scale inputs
is approximately 16 kHz. A sample set of meters could be tested
ADE7758
where CF REF = APCF EXPECTED = the pulse output of the reference
meter.
Step 7: Calculate xWG adjustment. One LSB change in xWG
(12 bits) changes the WATTHR register by 0.0244% and
therefore APCF by 0.0244%. The same relationship holds true
for VARCF.
APCFNUM [ 11 : 0 ] ?
APCF NOMINAL × × ? 1 +
xWG [ 11 : 0 ] ? (50)
?
?
to find a more exact value of the pulse output at full scale in the
user application.
To calculate the values for APCFNUM/APCFDEN and
VARCFNUM/VARCFDEN, use the following formulas:
APCF EXPECTED =
APCFDEN [ 11 : 0 ] ?
2 12
APCF NOMINAL = 16 kHz ×
MC × I TEST × V NOM
APCF EXPECTED =
×
xWG = –
V NOM
V FULLSCALE
1000 × 3600
I TEST
I FULLSCALE
× cos ( θ )
(45)
(46)
% Error
(51)
0 . 0244 %
When APCF is calibrated, the xWATTHR registers have the
same Wh/LSB from meter to meter if the meter constant and
the APCFNUM/APCFDEN ratio remain the same. The
? APCF NOMINAL ?
=
LSB
4 × ×
APCFDEN = INT ? ?
? APCF EXPECTED ?
where:
(47)
Wh/LSB constant is
Wh
MC
1000
1
APCFDEN
APCFNUM
×
1
WDIV
(52)
MC is the meter constant.
I TEST is the test current.
V NOM is the nominal voltage at which the meter is tested.
V FULLSCALE and I FULLSCALE are the values of current and voltage,
which correspond to the full-scale ADC inputs of the ADE7758 .
θ is the angle between the current and the voltage channel.
APCF EXPECTED is equivalent to the reference meter output under
the test conditions.
APCFNUM is written to 0 or 1.
The equations for calculating the VARCFNUM and
Return to Step 2 to calibrate Phase B and Phase C gain.
Example: Watt Gain Calibration of Phase A Using Pulse
Output
For this example, I TEST = 10 A, V NOM = 220 V, V FULLSCALE = 500 V,
I FULLSCALE = 130 A, MC = 3200 impulses/kWh, Power Factor = 1,
and Frequency = 50 Hz.
Clear APCFNUM (0x45) and write the calculated value to
APCFDEN (0x46) to perform a coarse adjustment on the
imp/kWh ratio, using Equation 45 through Equation 47.
× sin ( θ )
VARCF EXPECTED =
APCF NOMINAL = 16 kHz ×
× = 0 . 542 kHz
× cos ( 0 ) = 1 . 9556 Hz
APCF EXPECTED =
VARCFDEN during VAR calibration are similar:
MC × I TEST × V NOM
1000 × 3600
Because the APCFDEN and VARCFDEN values can be
(48)
220 10
500 130
3200 × 10 × 220
1000 × 3600
APCFDEN = INT ?
? = 277
? 1 . 9556 Hz ?
calculated from the meter design, these values can be written
to the part automatically during production calibration.
Step 5: Set the test system for I TEST , V NOM , and the unity power
factor. For VAR calibration, the power factor should be set to 0
inductive in this step. For watt and VA, the unity power factor
should be used. VAGAIN can be calibrated at the same time as
WGAIN because VAGAIN can be calibrated at the unity power
? 542 Hz ?
? ?
With Phase A contributing to CF, at I TEST , V NOM , and the unity
power factor, the example ADE7758 meter shows 2.058 Hz on
the pulse output. This is equivalent to a 5.26% error from the
reference meter value using Equation 49.
factor, and both pulse outputs can be measured simultaneously.
However, when calibrating VAGAIN at the same time as WGAIN,
the rms offsets should be calibrated first (see the Calibration of
%Error =
2. 058 Hz – 1. 9556 Hz
1 . 9556 Hz
× 100 % = 5 . 26 %
IRMS and VRMS Offset section).
Step 6: Measure the percent error in the pulse output, APCF
The AWG value is calculated to be ?216 d using Equation 51,
which means the value 0xF28 should be written to AWG.
% Error =
× 100 %
and/or VARCF, from the reference meter:
APCF – CF REF
CF REF
(49)
AWG = –
5 . 26 %
0 . 0244 %
= ? 215 . 5 = ? 216 = 0 xF 28
Rev. E | Page 45 of 72
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