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FDC2112-Q1: incorrect capacitance readings

Intellectual 1710 points

Replies: 5

Views: 80

Part Number: FDC2112-Q1

Hi Team,

Good day, we received query from customer regarding incorrect capacitance readings. The customer is designing a dielectric meter using FDC2112. According to the customer, the measured frequency is correct
but the calculated capacitance values are wrong.

Furthermore, they already checked also this link (FDC2112: the result is false) e2e.ti.com/.../736071

Regards,

Maynard

  • Hi Maynard,

    Can you describe more about the capacitance values are wrong ? How far off is the capacitance from expected values ? Also, the FDC2112 is meant for application that can detect a change in the capacitance and not a device to measure absolute capacitance. 

    Thanks,

    Arjun

    What are you sensing today ?

    Hall Effect Sensing FAQ  Inductive Sensing FAQ Ultrasonic Sensing FAQ

    "TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs."

  • In reply to Arjun_Prakash:

    Following graph gives the correlation between measured and correct values

  • In reply to Sundeep Goel:

    Hello, the graph is not well seen. Can you repost this. 

    Thanks,

    Arjun

    What are you sensing today ?

    Hall Effect Sensing FAQ  Inductive Sensing FAQ Ultrasonic Sensing FAQ

    "TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs."

  • In reply to Arjun_Prakash:

    Hi, have uploaded xls with readings and graph. Does this help ?

    calibration.xlsx

  • In reply to Sundeep Goel:

    Can you please post a new question with a new topic. This thread was created by a different user. 

    Thanks. 

    Thanks,

    Arjun

    What are you sensing today ?

    Hall Effect Sensing FAQ  Inductive Sensing FAQ Ultrasonic Sensing FAQ

    "TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs."