
Section 8. Processing and Math Instructions
Parameter
& Data Type
Enter
Source
The source variable array for the measurement(s), the input is expected as
millivolts out per volt in (the result of the full bridge instruction with a
multiplier of 1 and an offset of 0.
BrZero
The variable array that holds the unstrained reading(s) in millivolts out per
volt in.
BrConfig
The bridge configuration code can be entered as a positive or negative
number:
+ code:
V
0001.(Source )
ero
; bridge configured so its output
decreases with increasing strain.
- code:
V
0001.(Source )
ero
; bridge configured so output
increases with strain. This is the configuration for a quarter bridge using
CSI’s 4WFB350 Terminal Input Module (i.e., enter the bridge configuration
code as -1 for 1/4 bridge with TIM.)
Code Configuration
1
Quarter bridge strain gauge
µε =
−⋅
+
410
12
6
V
GF V
r
r
()
2 Half bridge strain gauge, one gage parallel to strain, the other at
90° to strain:
µε
νν
=
−⋅
+− −
410
12
6
V
GF V
r
r
[( ) ( )]
1
3 Half bridge strain gauge, one gage parallel to
+ε
, the other
parallel to
:
µε =
−⋅210
6
V
GF
r
4 Full bridge strain gage, 2 gages parallel to
+ε
, the other 2 parallel
to
:
µε =
−10
6
V
GF
r
5 Full bridge strain gage, half the bridge has 2 gages parallel to
and
: the other half
ε and
ε
:
µε
ν
=
−⋅
+
210
1
6
V
GF
r
()
6 Full bridge strain gage, one half
and
−νε
, the other half
ε
and
.:
µε
νν
=
−⋅
+− −
210
11
6
V
GF V
r
r
[( ) ( )]
GF
Gage Factor. The gage factor can be entered as a constant used for all
repetitions or a variable array can be loaded with individual gage factors
which are automatically used with each rep. To use an array enter the
parameter as arrayname(), with no element number in the parentheses.
v
Poisson ratio, enter 0 if it does not apply to configuration.
8-29
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