Ремонт мультиметров

30 июля 2015г. - 12:47 25478 просмотров


Ремонт мультиметровКак и любой другой предмет, мультиметр может выйти из строя во время работы или иметь изначальный, заводской дефект, незамеченный при производстве. Для того чтобы узнать, каким образом производить ремонт мультиметра, стоит сначала понять характер повреждений.

Специалисты советуют начинать поиск причины неисправности с тщательного осмотра печатной платы, так как возможны замыкания и плохие пайки, а также дефект выводов элементов по краям платы.

Заводской брак в этих устройствах проявляется в основном на дисплее. Их может быть до десяти видов (см. таблицу). Поэтому и ремонт цифровых мультиметров лучше производить с помощью инструкции, которая прилагается к прибору.

Схема цифрового мультиметра

Дефект Причина Решение
Во время запуска прибора экран загорается и медленно тухнет Говорит о поломке задающего генератора, откуда сигнал подается на подложку экрана Нужно провести проверку двух элементов: С1 и R15
Во время запуска экран загорается и медленно тухнет, но при отсутствии задней крышки проблема не возникает Контактная винтовая пружина при закрытой крышке давит на резистор R15 и замыкает цепь задающего генератора Можно отогнуть либо же укоротить саму пружину
Показатели экрана меняются от 0 до 1 во время включения прибора в режиме измерения напряжения Причиной могут быть плохо пропаянные, дефективные конденсаторы: С4, С5 и С2 и резистор R14 Нужно их пропаять либо проставить новые
Устройство слишком долго сбрасывает к нулю показания Причина некачественный конденсатор СЗ на входе Стоит заменить его на другой, с меньшим коэффициентом абсорбции
Показания на экране долго устанавливаются во время смены сопротивлений Происходит такое из-за некачественного конденсатора С5 Стоит заменить его на другой, с меньшим коэффициентом абсорбции
Прибор некорректно работает при включении каждого режима. Микросхема IC1 перегревается Это происходит из-за замыкания длинных выводов разъема для проверки транзисторов Нужно всего лишь разомкнуть выводы
Показания скачут при изменении напряжения: вместо 220 вольт показывают от 200 до 240 вольт Причина — потеря емкости конденсатора СЗ из-за его плохой пайки, пайки выводов либо же отсутствие самого конденсатора Нужно заменить исправный конденсатор с малым коэффициентом абсорбции
Во время включения прибор либо пищит, либо молчит во время прозвонки Происходит из-за некачественной пайки выводов микросхемы IC2 Для решения нужно пропаять выводы
Исчезание сегментов на экране Плохой контакт экрана с контактами платы через токопроводящие вставки Нужно поправить токопроводящие резиновые вставки, очистить спиртом контакты и облудить контакты на плате

Эти же поломки могут произойти и после эксплуатации. Вышеописанные неисправности могут появиться и в процессе эксплуатации. Однако если прибор работает в режиме постоянного измерения напряжения, то редко ломается.


Причиной тому его защита от перегрузок. Также ремонт неисправного устройства следует начинать с проверки питающего напряжения и работоспособности АЦП: напряжения стабилизации 3 В и отсутствия пробоя между выводами питания и общим выводом АЦП.

Опытные пользователи и профессионалы неоднократно заявляли о том, что одной из самых вероятных причин частых поломок в приборе является некачественное производство. А именно пайка контактов при помощи кислоты. В результате контакты просто окисляются.

Однако если нет уверенности в том, какая именно поломка стала причиной нерабочего состояния прибора, стоит все же обратиться к специалисту за советом или помощью.


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Комментарии (97) “Ремонт мультиметров”

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