Campbell Scientific CR7 Measurement and Control System - Manual (Page 142)

SECTION 13. CR7 MEASUREMENTS
13-18
TABLE 13.5-2. Calculating Resistance Values from Bridge Measurement
Instr. Result Instr. Multiplier and Offset
4 X V R R R
x s s f
= +
( / ( ))
R R
X V
X V
s f
x
x
=
−
/
/ 1
4.
59.
Mult. = 1/V
x
; ofs. = 0
Mult. = R
f
R
X V X V R
f
x x s
=
−
1
1 (( / ) / ( / )) /
4.
59.
42.
Mult. = 1/V
x
; ofs. = 0
Mult. = 1/R
s
5 X R R R
s s f
= +
/ ( )
R R
X
X
s f
=
−
1
5.
59.
Mult. = 1; ofs. = 0
Mult. = R
f
R
X X R
f
s
=
−
1
1 ( / ( )) /
5.
59.
42.
Mult. = 1; ofs. = 0
Mult. = 1/R
s
; ofs. = 0
6 or 9* X R R R R R R
= + − +
1000
3 3 4 2 1 2
[ / ( ) / ( )] *used for full bridge
R
X X R
1
1 1 2
1
1
=
−
( / ( )) /
6 or 9.
59.
42.
Mult. = -0.001; ofs. = R
3
/(R
3
+R
4
)
Mult. = 1/R
2
where X
1 3 3 4
1000
= − + +
X R R R / / ( )
R R X X
2 1 2 2
1
= −
( / ( )) 6 or 9.
59.
Mult. = -0.001; ofs. = R
3
/(R
3
+R
4
)
Mult. = R
1
where X
2 1
= X
R R X X
3 4 3 3
1
= −
( / ( )) 6 or 9.
59.
Mult. = 0.001; ofs. = R
2
/(R
1
+R
2
)
Mult. = R
4
where X
3 2 1 2
1000
= + +
X R R R / / ( )
R
X X R
4
4 4 3
1
1
=
−
( / ( )) /
6 or 9.
59.
42.
Mult. = 0.001; ofs. = R
2
/(R
1
+R
2
)
Mult. = 1/R
3
where X
4 3
= X
7&9* X R R
s f
=
/ *used as half bridge
R R X
s f
=
7 or 9. Mult. = Rf; ofs. = 0
R R X
f s
=
/ 7 or 9
42.
Mult. = 1/R
s
; ofs. = 0