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參數(shù)資料
| 型號： | ADE7758ARW |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Poly Phase Multifunction Energy Metering IC with Per Phase Information |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封裝： | MS-013-AD, SOIC-24 |
| 文件頁數(shù)： | 46/68頁 |
| 文件大小： | 1584K |
| 代理商： | ADE7758ARW |
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ADE7758
Rev. A | Page 46 of 68
0
START
STEP 1
ENABLE CF
OUTPUT
STEP 2
SET OFFSET
REGISTERS
XWATTOS, XVAROS
TO LOGIC 0
ALL PHASES
WATT
OFFSET AND
VA OFFSET
CALIBRATED
YES
NO
ALL PHASES
VAR OFFSET
CALIBRATED
YES
NO
SET UP APCF
PULSE OUTPUT
FOR PHASE A, B,
OR C
STEP 3
SET UP SYSTEM
FOR I
, V
NOM
,
PF = 1
STEP 4
MEASURE %
ERROR FOR
APCF
STEP 5
CALCULATE AND
WRITE TO
XWATTOS
END
SET UP VARCF
PULSE OUTPUT
FOR PHASE A, B,
OR C
STEP 3
SET UP SYSTEM
FOR I
, V
NOM
,
PF = 0
STEP 4
MEASURE %
ERROR FOR VARCF
MEASURE PERIOD
USING PERIOD
REGISTER
STEP 5
CALCULATE AND
WRITE TO
XVAROS
STEP 6.
REPEAT STEP
3 TO STEP 5
FOR XVAROS
Figure 79. Offset Calibration Using Pulse Output
Step 1: Repeat Step 1 and Step 3 from the gain calibration to
configure the ADE7758 pulse output.
Step 2: Set the xWATTOS and xVAROS registers to Logic 0.
Step 3: Set the test system for I
TEST
= I
MIN
, V
NOM
, and unity power
factor. For Step 6, set the test system for I
TEST
= I
MIN
, V
NOM
, and
zero-power factor.
Step 4: Measure the percent error in the pulse output, APCF or
VARCF, from the reference meter using Equation 31.
Step 5: Calculate xWATTOS using Equation 38 (for xVAROS
use Equation 39).
=
xWATTOS
(
APCF
%
–
)
APCFNUM
APCFDEN
Q
APCF
EXPECTED
ERROR
×
×
×
4
2
(38)
=
xVAROS
(
VARCF
%
–
)
VARCFNUM
VARCFDEN
Q
VARCF
EXPECTED
ERROR
×
×
×
4
2
(39)
where
Q
is defined in Equation 40 and Equation 41.
For xWATTOS
4
1
2
1
25
×
4
×
=
CLKIN
Q
(40)
For xVAROS
4
1
4
202
2
1
24
4
×
×
×
=
PERIOD
CLKIN
Q
(41)
where
PERIOD
is measured from the FREQ (0x10) register.
Step 6: Repeat Step 3 to Step 5 for xVAROS calibration.
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