How to connect strain gauge in the form of wheatstone bridge

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Discussion Overview

The discussion centers around the connection of strain gauges in a Wheatstone bridge configuration for a project involving an octagonal ring. Participants seek clarification on terminal designation and the principles of balance and imbalance in the bridge setup.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant, Syed, inquires whether either terminal of a strain gauge can be designated as positive or negative, or if there is a specific convention to follow.
  • Syed also requests assistance in connecting four strain gauges in a Wheatstone bridge configuration.
  • Another participant discusses the concept of balance in a Wheatstone bridge, explaining that a balanced bridge occurs when all four arms have the same voltage, resulting in zero output voltage.
  • A further contribution suggests that maximum imbalance occurs when one diagonal pair of resistors increases while the opposite pair decreases, and requests a diagram to illustrate this concept.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the terminal designation for the strain gauges, and the discussion on the Wheatstone bridge configuration remains unresolved with multiple viewpoints presented.

Contextual Notes

There are limitations regarding the assumptions about the strain gauge connections and the specific configurations of the Wheatstone bridge that have not been fully explored or clarified.

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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