My strain gauge on a cantiliver beam is reading 0.040V before force is applied...

[Micheal_Leo]

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

 

[Baluncore]

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.

 

[Micheal_Leo]

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

 

[Baluncore]

, 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?