The discussion centers on the acceptability of a 0.040V reading from a strain gauge connected to a cantilever beam before any force is applied. Participants concluded that a 0.040V offset is acceptable, particularly if the system's accuracy is within a 1% balance error, equating to a 4V drive. The strain gauge and bridge circuit appear to function correctly, as similar readings were observed with all resistors in the bridge. It is recommended to load the beam and test the output voltage to confirm proper operation.
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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 ,