Campbell Scientific CR9000X Measurement and Control System - Manual (Page 107)

Section 3. CR9000X Measurement Details
Electrical Bridge Circuits & Equations
BrHalf X = result w/mult = 1, offset = 0
X
V
V
R
R R
x
s
s f
= =
+
1
BRHalf Equations
( )
R R
X
X
R
R X
R
s f
f
s
s
=
−
=
−
1
1
BrHalf3W X = result w/mult = 1, offset = 0
X
V V
V V
R
R
X
s
f
=
−
−
=
2
2 1
1
BRHalf3W Equations
R R X
R R X
s f
f s
=
= /
BrHalf4W
H
L
H
L
X = result w/mult = 1, offset = 0
X
V
V
R
R
s
f
= =
2
1
BRHalf4W Equations
R R X
R R X
s f
f s
=
= /
BrFull
H
L
BrFull6W
H
L
H
L
X = result w/mult = 1, offset = 0
X
V
V
R
R R
R
R R
x
= =
+
−
+
⎛
⎝
⎜⎜
⎞
⎠
⎟⎟ 1000 1000
1 3
3 4
2
1 2
X = result w/mult = 1, offset = 0
X
V
V
R
R R
R
R R
= =
+
−
+
⎛
⎝
⎜⎜
⎞
⎠
⎟⎟ 1000 1000
2
1
3
3 4
2
1 2
BRFull and BRFull6W
Equations
( )
( )
( )
( )
X X R R R
R
R X
X
R
R X
X
X X R R R
R
R X
X
R
R X
X
1 3 3
1
2 1
1
2
1 1
1
2 2 1
3
4 2
2
4
3 2
2
1000
1
1
1000
1
1
= − + +
=
−
=
−
= + +
=
−
=
−
/ /
/ /
4
2
X
1
and X
2
are intermediate
variables for equation
solution.
FIGURE 3.1.5-1. Circuits used with bridge measurement instructions
3-19