参数资料
型号: 71M6543F-DB-CT
厂商: Maxim Integrated Products
文件页数: 37/91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
2.1.2 CALIBRATION WITH FIVE MEASUREMENTS
The five measurement method provides more orthogonality between the gain and phase error derivations. This
method involves measuring E V , E 0 , E 180 , E 60 , and E 300 . Again, set all calibration factors to nominal, i.e. CAL_IA
= 16384, CAL_VA = 16384, PHADJ_A = 0.
Note: The derivation of the calibration formulae is provided for CTs, where a phase adjustment is performed to
compensate for the phase error of the CT. For operation with 71M6xxx Remote Sensor Interfaces, a delay
compensation LCOMP2_n is used. Spreadsheets are available to calculate the calibration coefficients for all
hardware configurations.
First, calculate A XV from E V :
1. ?
A XV = E V + 1
Calculate A XI from E 0 and E 180 :
2.
E 0 =
IV A XV A XI cos( 0 ? φ S )
IV cos( 0 )
? 1 = A XV A XI cos( φ S ) ? 1
3.
E 180 =
IV A XV A XI cos(180 ? φ S )
IV cos( 180 )
? 1 = A XV A XI cos( φ S ) ? 1
4.
E 0 + E 180 = 2 A XV A XI cos( φ S ) ? 2
5.
A XV A XI =
E 0 + E 180 + 2
2 cos( φ S )
6. ?
A XI =
( E 0 + E 180 ) 2 + 1
A XV cos( φ S )
Use above results along with E 60 and E 300 to calculate φ S .
7.
E 60 =
IV A XV A XI cos( 60 ? φ S )
IV cos( 60 )
? 1
= A XV A XI cos( φ S ) + A XV A XI tan( 60 ) sin( φ S ) ? 1
8.
E 300 =
IV A XV A XI cos( ? 60 ? φ S )
IV cos( ? 60 )
? 1
= A XV A XI cos( φ S ) ? A XV A XI tan( 60 ) sin( φ S ) ? 1
Subtract 8 from 7
9.
E 60 ? E 300 = 2 A XV A XI tan( 60 ) sin( φ S )
use equation 5:
10.
E 60 ? E 300 =
E 0 + E 180 + 2
cos( φ S )
tan( 60 ) sin( φ S )
φ S = tan ? 1 ? ?
? ?
11.
12. ?
Page: 37 of 91
E 60 ? E 300 = ( E 0 + E 180 + 2 ) tan( 60 ) tan( φ S )
? ( E 60 ? E 300 ) ?
? tan( 60 )( E 0 + E 180 + 2 ) ?
v5
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