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SECTION
13.
21X MEASUREMENTS
lnstr.
4
TABLE 13.5-2. Calculating Resistance Values from Bridge Measurement
Result
Instr.
Muttiplier and Offset
I rf --
'
((x
tv)t(1-x/vx))/Rs
5
X=Rr/(R"+R1)
X
R"=Rt-
-
'1-X
1
Fl{ =-
'
(xt(1-X))/Rs
6,8,9*
X-1000[R3 /(R3 +Ra) -Rz/(R1+R2)]
Rl
=------1-
'
(X, /(1-X1))/R2
where
Xr =-X/1000+R3 /(R3 +Ra)
Rz=Rr(.X2/(-Xz))
where
Xz
=
Xt
R3 =
Ra
(X3 /
(1-
X3
))
where
X3
=
x
/
1000
+R2 /(R1
+
Rr)
E
-
(X+
t(1-X4))/Rs
where
X+
=
X3
7&9*
X=Rs /Rr
Rs
-Rf
X
Rt
=R.
/x
Mult.
=
1A/";
ofs. =
O
Mult.
=
Rr
Mult.
=
1A/";
ofs. =
0
Mult.
=
1/Rs
Mult.
=
1;
ofs. =
0
mult.
=
Rr
Mult.
=
1;
ofs.
=
0
59.
Mult.
= 1/R"; ofs.
= 0
42.
*used
for full bridge
6 or
9.
Mult. =
-0.001i ofs. =
Rg/(Rg+Ra)
g.
Mult.
=
1A/";
ofs.
=
Rs/(Rs+R+)
59.
Mult.
=
1/Rz
42.
6
or
9.
Mult. =
-0.001i ofs. =
Rg/(Ra+Ra)
59.
Mult.
=
Rr
6 or
9.
Mult.
-
0.001; ofs.
=
Rzl(Rr+Rz)
59.
Mult.
=
Rn
6or9.
Mult. = 0.001; ofs.
-
R2/(R1+R2)
Mult.
=
1/Rs
"used as half bridge
7 or
9.
Mult.
=
R1;
ofs. =
0
7
or
9.
Mult.
= 1/R"; ofs. =
0
42.
X=Vx(Rs/(R"+R1))
x
/v_
R"
=Rt
-
'1-X/Vx
1
4.
59.
4.
59.
42.
5.
59.
5.
59.
42.
13-18
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