Campbell CR1000 - Table 73. Straincalc() Instruction Equations

Section 8. Operation
sets the polarity of V
r
to negative.
Table 73. StrainCalc() Instruction Equations
StrainCalc()
BrConfig Code Configuration
1
Quarter-bridge strain gage:
2
Half-bridge strain gage. One gage parallel to strain, the other at 90° to
strain.
3
Half-bridge strain gage. One gage parallel to +
, the other parallel to -
:
4
Full-bridge strain gage. Two gages parallel to +
, the other two parallel
to -
:
5
Full-bridge strain gage. Half the bridge has two gages parallel to +
and
-
, and the other half to + and - :
6
Full-bridge strain gage. Half the bridge has two gages parallel to +
and
-
, and the other half to - and + :
where:
•
: Poisson's Ratio (0 if not applicable)
• GF: Gage Factor
• V
r
: 0.001 (Source-Zero) if BRConfig code is positive (+)
• V
r
: –0.001 (Source-Zero) if BRConfig code is negative (–)
and where:
• "source": the result of the full-bridge measurement (X = 1000 • V
1
/ V
x
) when
multiplier = 1 and offset = 0.
• "zero": gage offset to establish an arbitrary zero (see FieldCalStrain() in
FieldCal() Examples
(p. 213) ).
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