Campbell CR1000 User Manual

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) ).
343

Campbell CR1000 Specifications

General

Power Requirements	9.6 to 16 VDC
Data Logger Operating System	CRBasic
Memory	4 MB
Analog Inputs	16 single-ended or 8 differential
Analog Input Resolution	13 bits
Analog Input Range	+/-2.5V
Digital I/O	8
Pulse Counters	2
Communication Ports	RS-232
Operating Temperature	-25°C to +50°C
Pulse Channels	4