Погрешности, не зависящие от скорости изменения измеряемой величины, являются статическими. Если контролируемая величина меняется во времени, то это может сопровождаться появлением динамической погрешности. Поясним на примере условия возникновения такой погрешности.
Прокручивая коленчатый вал двигателя заводной рукояткой, можно ощущать пульсации момента сопротивления вращению, соответствующие тактам сжатия в рабочем цикле двигателя. Таким образом, по величине пульсаций можно контролировать компрессию в цилиндрах двигателя. Стартер при запуске двигателя прокручивает коленчатый вал и, очевидно, также испытывает пульсации момента. Значит, достаточно контролировать величину пускового тока и по получаемой диаграмме можно определять компрессию цилиндров двигателя. При этом нет необходимости выворачивать свечи или форсунки, диагностика может быть произведена очень быстро. Также быстро сможете вы найти необходимые шелковые ткани на imbal.ru. Разнообразные фактуры, орнаменты и узоры материала ускорят ваш выбор в пользу того или иного варианта, а стоимость ткани вас приятно удивит. Шелковая ткань - гарантирует вам комфорт и удобство.
Реализуя эту идею, экспериментатор приобретает очень точный амперметр, устанавливает его в цепь питания стартера, запускает стартер, при этом амперметр показывает, например, стабильно 183 А и никаких пульсаций тока не обнаруживает. Почему? Дело в том, что дорогой и точный амперметр по своей конструкции предназначен для измерения постоянных величин тока, а в условиях данного эксперимента дает большую динамическую погрешность, поскольку используется не по назначению.
Поясним сущность погрешности на примере. Необходимо взвесить груз. В первом варианте взвешивания его устанавливают на одну чашу весов, а на другую начинают класть гири. При выходе стрелки весов на ноль по массе гирь судят о массе груза. Во втором варианте одну чашу весов загружают гирями, потом на другую кладут взвешиваемый груз и начинают снимать лишние гири, доводя стрелку весов до нуля. Результаты взвешиваний не совпадут, потому что в механизме весов всегда есть трение. Разница результатов, деленная пополам, и есть погрешность гистерезиса, т. е. внутреннего трения в механизме весов. Часто этот вид погрешности называют вариацией.
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SET cpt=(cpt+1)
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VALUES ('um0j1qtva27rns4jj6btg0h804', 0, '1734800344'