Accuracy For Resistance Measurements - Campbell CR300 Series Product Manual

Table 14-1: StrainCalc() configuration codes
BrConfig Code
5
6
Where:
ν : Poisson's Ratio (0 if not applicable).
GF: Gage Factor.
V : 0.001 (Source-Zero) if BRConfig code is positive (+).
r
: –0.001 (Source-Zero) if BRConfig code is negative (–).
V
r
and where:
"source": the result of the full-bridge measurement (X = 1000 • V1 / Vx) when multiplier = 1 and offset = 0.
"zero": gage offset to establish an arbitrary zero.

14.3.3 Accuracy for resistance measurements

Consult the following technical papers for in-depth treatments of several topics addressing
voltage measurement quality:
Preventing and Attacking Measurement Noise Problems
l
Benefits of Input Reversal and Excitation Reversal for Voltage Measurements
l
Voltage Measurement Accuracy, Self- Calibration, and Ratiometric Measurements
l
NOTE:
Error discussed in this section and error-related specifications of the CR300 series do not
include error introduced by the sensor, or by the transmission of the sensor signal to the data
logger.
For accuracy specifications of ratiometric resistance measurements, see
specifications (p. 189). Voltage measurement is variable V
Offset is the same as that for simple analog voltage measurements.
Full-bridge strain gage. Half the bridge has two gages parallel to +ɛ
and -ɛ, and the other half to +νɛ and -νɛ
Full-bridge strain gage. Half the bridge has two gages parallel to +ɛ
and -νɛ , and the other half to -νɛ and +ɛ:
Configuration
Resistance measurement
or V in resistance measurements.
1 2
14. Measurements 77