What is the correct setting of the measuring amplifier for conversion of bridge signal (mV/V) into strain (µm/m)
In the case of a stress analysis with strain gauges, the scaling factor in the measuring amplifier must be set correctly.
The following are decisive for the setting:
1. Bridge type (full, half, quarter bridge), whereby of course only the active strain gages are used for the scaling. (Which are claimed, no supplemental resistors or passive strain gauges for thermal compensation)
2. gage-factor of the strain gauge
3. Set physical measuring range on the measuring amplifier
If you also measure transverse contraction or do stress analysis with triple rosettes (examine a biaxial state of stress and determine principal strains or principal stresses), then material data such as Poisson's ratio and Young's modulus are also crucial.
You should do it in this order:
https://www.me-systeme.de/en/technology-first/strain-gauge/stress-analysis-with-strain-gauges
https://www.me-systeme.de/en/technology-first/strain-gauge/basics-of-bridge-circuit
https://www.me-systeme.de/en/technology-first/strain-gauge/strain-gauge-bridge-circuit
Außerdem kann dieser Kalkulator helfen, um Brückenverstimmung in Dehnung umzurechnen:
Some measuring amplifiers have a bridge extension, i.e. quarter and half bridges can be connected without any further extensions. As a rule, this must be activated by a jumper wire in the connection plug or on the connection strip.