Section 4
4-7
Subtracting (9) from (8):
nV(-t)(-)-nV(+t)(-)= Rs.
2.t
N
.Ixx
(10)
Adding expressions (7) and (10):
2.t
N
.Ix+Ixx.Rs=nVexpr
(11)
where:
nVexpr = nV(+t)(+)- nV(-t)(+) + nV(-t)(-)- nV(+t)(-)
(12)
Then:
Ix+ Ixx =
N
2.Rs.t
.nVexpr
(13)
To remove the offset caused by any core offset currents we can subtract expression (5) from
(8) to get:
nV(-t)(-)-nV(-t)(+)=
t-Tn
N
.(Ix+Ixx).Rs +(Ix+Ixx).Rx
(14)
Then:
Rx
Rs
.nVexpr+
t-Tn
N
.nVexpr =
2.t
N
. nV(-t)(-)-nV(-t)(+)
(15)
and the resistance ratio can be resolved:
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