Campbell Scientific CR5000 Measurement and Control Module - Manual (Page 72)

Section 3. CR5000 Measurement Details
3-18
BrHalf4W
H
L
H
L
X = result w/mult = 1, offset = 0
X
V
V
R
R
s
f
= = 2
1
R R X
R R X
s f
f s
=
=
/
BrFull
H
L
X = result w/mult = 1, offset = 0
X 1000
V
1
Vx
1000
R
3
R
3
R
4
R
2
R
1
R
2
= =
+
−
+






( )
( )
X X R R R
R
R X
X
R
R X
X
1 3 3 4
1
2 1
1
2
1 1
1
1000
1
1
= − + +
=
−
=
−
/ /
BrFull6W
H
L
H
L
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
( )
( )
X X R R R
R
R X
X
R
R X
X
2 2 1 2
3
4 2
2
4
3 2
2
1000
1
1
= + +
=
−
=
−
/ /
Resistance
H
L
H
I
IXR
X = result w/mult = 1, offset = 0
X
V
I
R
x
s
= =
Resistance
used to measure full bridge
H
L
IXR
X = result w/mult = 1, offset = 0
X
V
I
R
R
R R
R
R R
R R R R R R
R R R R
x
bridge
= =
+
−
+






=
+ − +
+ + +
1 3
3 4
2
1 2
3 1 2 2 3 4
1 2 3 4
( ) ( )
( )
R
R R X R R R
X R
R
R R X R R R
X R
R
R R X R R R
X R
R
R R X R R R
X R
1
2 4 2 3 4
3
2
1 3 1 3 4
4
3
2 4 1 2 4
1
4
1 3 1 2 3
2
=
− − + +
−
=
− + +
+
=
− − + +
−
=
− + +
+
( )
( )
( )
FIGURE 3.5-1. Circuits Used with Bridge Measurement Instructions