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INA326: INA 326 and transducer

Part Number: INA326

Hello, I have a question about INA 326 instrumentation amplifier and pressure transducer. I use a circuit from INA326 datasheet 9 page, except I don't use filtering at output of amplifier. R1=4,7k, R2=100k, so gain could be aproximetely 40-50. On the pin 5, I connect 100k resistor and 0,1uF condensator. Problem is that, when I apply pressure to my transducer voltage between data signals is 30mV. So, for my gain, output voltage could be about 1,2-1,4V, but when i check voltage with multimeter I see only 160mV, and when I applied more pressure to my transducer, voltage in the output of amplifier didnt change, still 160mV. Both, transducer and amplifier powered by Arduino, and I check voltage between amplifier output pin and common ground in the breadboard. What can be problem? I attach INA326 datasheet and my breadboard connected circuit, maybe there are some connection errors. 

http://www.ti.com/lit/ds/symlink/ina326.pdf

  • Hi Eimis,

    In order to support this I will need you to post a copy of YOUR schematic (not from datasheet) showing your configuration and the values you are using including the sensor input and the circuit output connections. Please include input levels on each pin as well as supply voltages and the reference voltage. If you could include more information about your pressure transducer this may also be helpful. Before doing this I would recommend you triple check all of your connections. Please understand that it is incredibly difficult for us to troubleshoot breadboarded circuits remotely, especially without a schematic. 

  • Eimis
    We are going to close this thread, however if you need further help feel free to post a schematic and one of the team will assist you.