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參數(shù)資料
| 型號： | ADE7758 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Poly Phase Multifunction Energy Metering IC with Per Phase Information |
| 中文描述： | 多相多功能電能計量IC每相位信息 |
| 文件頁數(shù)： | 43/68頁 |
| 文件大?。?/td> | 1584K |
| 代理商： | ADE7758 |
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ADE7758
Rev. A | Page 43 of 68
0
START
STEP 1
ENABLE CF AND
VARCF PULSE
OUTPUTS
STEP 1A
STEP 2
SET GAIN REGISTERS: XWG,
XVAG, XVARG TO LOGIC 0
SELECT VA FOR
VARCF OUTPUT
CFNUM/VARCFNUM
SET TO CALCULATE
VALUES
NO
YES
ALL
PHASES VA
AND WATT
GAIN CAL
YES
NO
STEP 3
SET UP PULSE
OUTPUT FOR
PHASE A, B, OR C
STEP 5
SET UP SYSTEM
FOR I
, V
NOM
PF = 1
STEP 6
MEASURE %
ERROR FOR APCF
AND VARCF
STEP 7
CALCULATE AND
WRITE TO
XWG, XVAG
CALCULATE Wh/LSB
AND VAh/LSB
CONSTANTS
SET CFNUM/VARCFNUM
AND CFDEN/VARCFDEN
TO CALCULATED VALUES
STEP 4
END
ALL PHASES
VAR GAIN
CALIBRATED
YES
NO
SELECT VAR
FOR VARCF
OUTPUT
STEP 3
SET UP PULSE
OUTPUT FOR
PHASE A, B, OR C
VARCFNUM/
VARCFDEN
SET TO CALCULATED
VALUES
NO
YES
STEP 5
SET UP SYSTEM
FOR I
, V
NOM
PF = 0
STEP 6
MEASURE %
ERROR FOR
VARCF
STEP 7
CALCULATE AND
WRITE TO XVARG
CALCULATE
kVARh/LSB
CONSTANT
SET
VARCFNUM/VARCFDEN TO
CALCULATED VALUES
STEP 4
Figure 77. Gain Calibration Using Pulse Output
Step 1: Enable the pulse output by setting Bit 2 of the OPMODE
register (0x13) to Logic 0. This bit enables both the APCF and
VARCF pulses.
Step 1a: VAR and VA share the VARCF pulse output.
WAVMODE[7], Address (0x15), should be set to choose
between VAR or VA pulses on the output. Setting the bit to Logic
1 selects VA. The default is Logic 0 or VARCF pulse output.
Step 2: Ensure the xWG/xVARG/xVAG are set to Logic 0.
Step 3: Disable the Phase B and Phase C contribution to the
APCF and VARCF pulses. This is done by the TERMSEL[2:4]
bits of the COMPMODE register (0x16). Setting Bit 2 to Logic 1
and Bit 3 and Bit 4 to Logic 0 allows only Phase A to be included
in the pulse outputs.
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, VARCFNUM (0x47)
and VARCFDEN(0x48) should be set to the calculated value.
The pulse output frequency with one phase at full-scale inputs
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