How to connect strain gauge in the form of wheatstone bridge

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SUMMARY

This discussion focuses on connecting four metal foil strain gauges with a gauge factor of 2 and a resistance of 320 ohms in a Wheatstone bridge configuration. Users inquire about the polarity of the strain gauge terminals and the proper setup for achieving a balanced bridge. It is established that either terminal can be designated as positive or negative, and the arrangement of the strain gauges should maximize voltage imbalance for accurate measurements. The discussion emphasizes the importance of understanding the balance and imbalance conditions in a Wheatstone bridge.

PREREQUISITES
  • Understanding of Wheatstone bridge configurations
  • Knowledge of strain gauge specifications, including gauge factor and resistance
  • Basic electronics principles, particularly voltage measurement
  • Familiarity with circuit diagrams and their interpretation
NEXT STEPS
  • Research how to wire strain gauges in a Wheatstone bridge configuration
  • Learn about the effects of temperature compensation on strain gauge readings
  • Explore methods for calibrating strain gauges for accurate measurements
  • Investigate data acquisition systems compatible with strain gauge outputs
USEFUL FOR

Engineers, researchers, and students involved in mechanical testing, structural health monitoring, or any projects requiring precise strain measurements using Wheatstone bridges.

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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