参数资料
型号: 71M6543F-DB-CT
厂商: Maxim Integrated Products
文件页数: 36/91页
文件大小: 0K
描述: DEMO BOARD 71M6543F-DB-CT
标准包装: 1
系列: *
71M6543 Demo Board User’s Manual
From the voltage measurement, we determine that
1. ?
A XV = E V + 1
We use the other two measurements to determine φ S and A XI .
2.
E 0 =
IV A XV A XI cos( 0 ? φ S )
IV cos( 0 )
? 1 = A XV A XI cos( φ S ) ? 1
2a.
A XV A XI =
E 0 + 1
cos( φ S )
3.
E 60 =
IV A XV A XI cos( 60 ? φ S )
IV cos( 60 )
? 1 = A XV A XI
cos( 60 ? φ S )
cos( 60 )
? 1
3a.
E 60 =
A XV A XI [ cos( 60) cos( φ S ) + sin( 60) sin( φ S ) ]
cos( 60 )
? 1
= A XV A XI cos( φ S ) + A XV A XI tan( 60 ) sin( φ S ) ? 1
Combining 2a and 3a:
4.
E 60 = E 0 + ( E 0 + 1 ) tan( 60 ) tan( φ S )
5.
tan( φ S ) =
E 60 ? E 0
( E 0 + 1 ) tan( 60 )
φ S = tan ? 1 ? ?
? ?
6. ?
? E 60 ? E 0 ?
? ( E 0 + 1 ) tan( 60 ) ?
and from 2a:
7. ?
A XI =
E 0 + 1
A XV cos( φ S )
Now that we know the A XV , A XI , and φ S errors, we calculate the new calibration voltage gain coefficient from the
previous ones:
CAL _ V NEW =
CAL _ V
A XV
? tan( φ S ) 1 + ( 1 ? 2 ? 9 ) 2 ? 2 ( 1 ? 2 ? 9 ) cos( 2 π f 0 T ) ] ?
[
]
? ( 1 ? 2 ) sin( 2 π f 0 T ) ? tan( φ S ) 1 ? ( 1 ? 2 ) cos( 2 π f 0 T ) ?
We calculate PHADJ from φ S , the desired phase lag:
PHADJ = 2 20 ? ? 9 ? 9 ?
And we calculate the new calibration current gain coefficient, including compensation for a slight gain increase
in the phase calibration circuit.
CAL _ I NEW =
Page: 36 of 91
CAL _ I
A XI
1 +
1
2 ? 20 PHADJ ( 2 + 2 ? 20 PHADJ ? 2(1 ? 2 ? 9 ) cos( 2 π f 0 T ))
1 ? 2 ( 1 ? 2 ? 9 ) cos( 2 π f 0 T ) + ( 1 ? 2 ? 9 ) 2
v5
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