How to connect strain gauge in the form of wheatstone bridge

AI Thread Summary
The discussion revolves around connecting four metal foil strain gauges in a Wheatstone bridge configuration for a project. It addresses two main questions: whether either terminal of the strain gauge can be designated as positive or negative, and how to properly connect the gauges in the bridge setup. It is clarified that a balanced Wheatstone bridge occurs when all arms have the same voltage, resulting in zero output, while an unbalanced bridge produces a measurable output voltage. For optimal performance, it is suggested to position one pair of strain gauges on the front and the other pair on the back of the flexing beam. Understanding these connections is crucial for achieving accurate strain measurements in the project.
syedshaul
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HAI I am SYED , i am doing my project using strain gauges.

Problem description: I have 4 strain gauges bonded to an octagonal ring. The strain gauge i am using is METAL FOIL TYPE , GF(gauge factor) -2 and 320ohm resistance. The strain gauge has two terminals ,my question is
(1) Can anyone of the two terminals can be taken as positive and other as negative or is there any convention that the specified terminal should be taken as positive or negative...?

(2) I need help in connecting these 4 strain gauges in the form of Wheatstone bridge... ?

please help ... it would be very much helpful for my project i am very thankful for your help
 
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syedshaul said:
HAI I am SYED , i am doing my project using strain gauges.

Problem description: I have 4 strain gauges bonded to an octagonal ring. The strain gauge i am using is METAL FOIL TYPE , GF(gauge factor) -2 and 320ohm resistance. The strain gauge has two terminals ,my question is
(1) Can anyone of the two terminals can be taken as positive and other as negative or is there any convention that the specified terminal should be taken as positive or negative...?

(2) I need help in connecting these 4 strain gauges in the form of Wheatstone bridge... ?

please help ... it would be very much helpful for my project i am very thankful for your help

What do you know about bridges in general? What produces 'balance' and 'imbalance?
 
What do you know about bridges in general? What produces 'balance' and

when all the 4 arms in a Wheatstone bridge has same voltage in my case Millivolt produced by strain gauge the output voltage is zero then it is called balanced bridge and when one arm has high voltage than other arms then there is a output voltage this is called unbalanced bridge.
 
OK, so maximum imbalance is when diagonally opposite pair of resistors increase and the other diagonal resistors decrease. Fit one pair to the front and one pair to the back of your flexing beam for maximum unbalanced volts.
Could you draw a diagram of that for me, to show you've got the idea?
 

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