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INA333: ina333

akshaya R S
Prodigy 10 points
Part Number: INA333
Respected Sir /Madam

I was using INA333 to amplify the output from Wheatstone bridge. The x axis in both graph represents the resistance value in kohm and y axis represents voltage value from Wheatstone bridge and amplifier in volts. INA333 amp supply = 5v; gain =10; Rg=11kohm. The output of Wheatstone bridge is linear but not the amplifier output. what’s the reason for it?

Respected Sir /MadamI was using INA333 to amplify the output from Wheatstone bridge. The x axis in both graph represents the resistance value in kohm and y axis represents voltage value from Wheatstone bridge and amplifier in volts. INA333 amp supply = 5v; gain =10; Rg=11kohm. The output of Wheatstone bridge is linear but not the amplifier output. what’s the reason for it?
 
 

  • 0
    Guru 140200 points

    Hi Akshaya,

    can you show a schematic?

    How do you connect the REF input of INA333?

    How looks the bridge like? The resistance value you mention, is this the resistance of the whole bridge or of one leg only?

    Kai

  • 0 in reply to kai klaas69
    TI__Guru 55466 points
    Hi Akshaya,

    As Kai has mentioned, if you could please share an schematic showing all the INA333 reference input, V- and V+ supply, VIN+,VIN- and REF input as well as the sensor and the Wheatstone bridge connections this will be helpful. Can you please explain the axis on the voltage plots above, what is the nominal resistance of the Wheatstone bridge, or are we looking at the resistance of one leg?

    Thank you and Regards,
    Luis
  • 0 in reply to Luis Chioye
    TI__Genius 11135 points
    Akshaya,

    We have not heard back from you so we will close this thread. Please reply if further discussion is needed.

    Regards
    Dennis