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TMP007: Recalibration

NAOKI AOYAMA
Guru 11215 points
Part Number: TMP007

Hello,

Our customer use the TMP007, have a question.

It is mentioned "Recalibration may be required under conditions" on the datasheet P15.

"6 Object and local temperature transients significantly changed."

How about the significantly changed?

Best Regards,

Naoki Aoyama

  • 0
    TI__Expert 5695 points
    TI support team will contact you shortly.
  • 0
    TI__Mastermind 35855 points
    Calibration should be performed with data covering the temperature range expected in the application. The calibration is a curve fitting process, so you can expect error to continuously increase as you get further from the calibrated temperature range. Die temperature change is more difficult to correct for than object temperature change. You can expect object temperature error to increase by 1C for every 10C that you exceed the calibrated die temperature range. However, every calibration is unique.

    Ren
  • 0 in reply to Ren Schackmann
    Guru 11215 points
    Hello Ren,

    Thank you for your reply.

    It is mentioned on the TMP007 Calibration Guide P7 as follows.
    It is recommended to consider using the transient correction mode when the change in TDIE is greater than
    5°C/minute.
    Does "significantly change" mean 5 degree/minute?

    The customer will use the transient correction mode. Because the die temperature will change at measuring.
    Does the customer need to calibration every time?

    Best Regards,
    Naoki Aoyama
  • 0 in reply to NAOKI AOYAMA
    TI__Mastermind 35855 points
    Transient Correction is a filter for time domain. We recommend that customers use it when the die temperature changes quickly, as you noted. To get the most out of Transient Correction, customer will need to adjust TC coefficients.

    The phrase "significantly change" was used in a different context. It was used with regards to temperature range.

    To get the best performance, it is recommended to calibrate each sensor in customer's production. We call this personal calibration. Our datasheet is written with the assumption that customer will perform a one-time system calibration prior to production. We call this common calibration.

    Ren
  • 0 in reply to Ren Schackmann
    Guru 11215 points
    Hello Ren,

    Thank you for your reply.
    When the customer adjust TC coefficients and not changed the temperature range,
    is it no need to re-calibration?

    Regards,
    Naoki Aoyama
  • 0 in reply to NAOKI AOYAMA
    TI__Mastermind 35855 points
    Yes, there is no need to re-calibrate (change other coefficients) when adjusting TC coefficients. This is because TC coefficients affect filtering in time domain. The other coefficients define relationship between radiation received (voltage developed on thermopile) and actual object temperature.

    Ren
  • 0 in reply to Ren Schackmann
    Guru 11215 points
    Hi Ren,

    Thank you for your reply.
    I'll feedback the customer this information.

    Very Thanks,
    Naoki Aoyama