B Is a 0.040V Reading on a Strain Gauge Before Force Applied Acceptable?

AI Thread Summary
A reading of 0.040V on a strain gauge before force is applied is generally acceptable, indicating that the system may still function properly despite the offset. The zero voltage may fluctuate slightly due to various factors, including the accuracy of the measurement system. It is suggested to load the beam and test the bridge normally to confirm functionality. The consistent 0.040V reading when connecting resistors indicates that the issue might not solely be with the strain gauge. Ensuring proper circuit setup and considering amplifier offsets are crucial for accurate measurements.
Micheal_Leo
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i connect strain gauge on cantiliver beam and getting reading 0.040v before force applied , the theory said that bridhe should be balance mean=0

1) does 0.040 acceptable to carry on work

or

2) how can i make it to 0so that it balanced
 
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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.
 
Baluncore 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.
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 value
 
Micheal_Leo said:
, same value i am getting 0.040 ,
Does the beam and strain gauge provide a change of output voltage when loaded?

Please provide the circuit for your strain gauge system.
Maybe 40 mV is the offset voltage of the amplifier, or meter.
How do you measure voltage?
Do you have an amplifier?
 
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