{"id":108738,"date":"2023-03-01T14:37:00","date_gmt":"2023-03-01T14:37:00","guid":{"rendered":"https:\/\/34.38.16.0\/?p=108738"},"modified":"2024-06-20T08:30:09","modified_gmt":"2024-06-20T08:30:09","slug":"technical-pills-response-time","status":"publish","type":"post","link":"https:\/\/lsi-lastem.com\/es\/technical-pills-response-time\/","title":{"rendered":"The LSI LASTEM technical pills: How response time can make the difference"},"content":{"rendered":"\t\t
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The LSI LASTEM technical pills: How response time can make the difference<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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One of the critical parameters for evaluating the performance of measuring instruments is the\u00a0response time<\/b>, i.e. the time\u00a0taken by the instrument<\/b>\u00a0to provide a stable and reliable reading of the physical quantity, after a variation of the same has been applied.\u00a0<\/p>

When choosing a measuring instrument, it is good to keep this concept in mind and select a sensor that has\u00a0response times suitable for your needs<\/b>, especially for those sensors of physical quantities with slower achievement of the stability condition.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Response time<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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An instrument that measures a generic magnitude, such as temperature, pressure, wind speed, etc., can be in\u00a0two conditions<\/b>:<\/p>

  • In a stability regime<\/b>, which occurs when environmental conditions are substantially constant and do not undergo significant variations;<\/li>
  • In a dynamic regime<\/b>, which occurs when environmental conditions change suddenly.<\/li><\/ul>

    In a stability regime, the instruments are able to make\u00a0precise measurements<\/b>\u00a0of the magnitude for which they were designed.\u00a0<\/p>

    In a dynamic regime, however, the magnitude varies rapidly from one value to another and the instrument\u00a0takes time<\/b>\u00a0to reach the new condition and make a new measurement.<\/p>

    The ideal measuring instrument should be able to detect the new condition instantly. In reality, however, the\u00a0response<\/b>\u00a0only happens within\u00a0a few seconds or a few minutes<\/b>. This behavior is due to the fact that the instruments have a certain inertia in responding to changes, leading to a delay in measurement.<\/p>

    Response speed is one of the most important characteristics of measuring instruments and the shorter the reaction time, the higher the quality of the instrument.<\/b><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    The\u00a0response time<\/b>\u00a0of the measuring instruments is defined by the time constant \u03c4, which indicates 63,2% of the time it takes the instrument to measure the new condition. After about 4-5 time constants, the instrument will be able to measure more or less 99% of the variation. The response to this rapid variation is called \u201cstep response\u201d and is usually exponential as in the\u00a0figure<\/i>.<\/p><\/div><\/div><\/div><\/div><\/div>

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