Internal Calibration for Instruments in Lab Settings
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Internal Calibration for Instruments in Lab Settings

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Questions and Answers

What is the formula for gravitational force as expressed in the text?

  • F = m - g
  • F = m · g (correct)
  • F = m / g
  • F = m + g

    • In the context of mass measurement, what is the purpose of the compensation force F_c?

  • It creates a displacement in the surrounding air.
  • It attracts the object to be weighed.
  • It opposes the gravitational force.
  • It compensates for the buoyancy force. (correct)

    • What factors influence the buoyancy force according to the text?

  • Pressure, temperature, and humidity (correct)
  • Density of the medium and gravitational acceleration
  • Density of atmospheric air and density of reference weights
  • Density of the object and volume of air displaced

    • Why is continuous calculation of the buoyancy force necessary in high resolution balances?

    <p>To counteract errors caused by air density changes</p> Signup and view all the answers

    What is the relationship between the density of reference weights and the error caused by changes in air density?

    <p>Lower density reference weights lead to higher errors</p> Signup and view all the answers

    How can one estimate the density of ambient air as per OIML R111, section E3?

    <p>By applying a formula specified in OIML R111</p> Signup and view all the answers

    What process uses the balance's inner mechanism to self-calibrate?

    <p>Internal calibration</p> Signup and view all the answers

    When must instruments be adjusted with Internal Calibration before use?

    <p>Before the lab calibration</p> Signup and view all the answers

    What is the formula representing the indication of an instrument in relation to the force exerted by a weighing object?

    <p>$I = k_s · m · g · (1- ρ_α / ρ)$</p> Signup and view all the answers

    What function must instruments equipped with an automatic zero-setting or zero-tracking function be calibrated in accordance with?

    <p>Customer's setting</p> Signup and view all the answers

    Which factor compensates for the force due to the air buoyancy of the weighing object in the formula for indication?

    <p>$ρ_a$ - density of air ambient</p> Signup and view all the answers

    What type of weights can be used for carrying out adjustment on instruments?

    <p>External or built-in test weights</p> Signup and view all the answers

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