i just observe that i remove strain gauge from circuit and connect all 4 resistors in bridge , same value i am getting 0.040 , all 4 resistors and strain gauge has 120 ohm valueBaluncore said:It is probably working. Zero may wander a bit.
If accuracy is quoted as 1% balance error, then 0.04 V = 4 volt drive.
Load the beam and bridge normally, test it.
Does the beam and strain gauge provide a change of output voltage when loaded?Micheal_Leo said:, same value i am getting 0.040 ,
This initial reading is likely due to an offset voltage or zero drift in the measurement system. Strain gauges and their associated electronics can have small inherent biases or offsets that cause a non-zero reading even when no strain is present.
You can correct the initial offset by using a process called zeroing or taring. This involves recording the initial offset voltage and subtracting it from all subsequent measurements to ensure that your readings reflect only the strain induced by applied forces.
Yes, it is normal for strain gauges to have an initial voltage reading due to factors such as manufacturing tolerances, temperature variations, and electronic noise. These factors can introduce small offsets that appear as a non-zero initial reading.
Yes, temperature changes can affect strain gauge readings. Strain gauges are sensitive to temperature variations, which can cause thermal expansion or contraction of the gauge material and the substrate, leading to changes in the output voltage. Using temperature compensation techniques can help mitigate this effect.
To ensure accurate strain gauge measurements, you should: (1) zero the gauge before taking measurements, (2) use proper temperature compensation, (3) ensure that the strain gauge is properly bonded to the substrate, (4) use high-quality, low-noise electronics, and (5) regularly calibrate your measurement system.