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热电阻指示问题

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我司有一热电阻 pt100 的 现指示偏低 能是什么原因呢?
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用万用表打下,如果对比还是偏低,那就是坏了。
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显示偏低或不稳:保护管内有金属屑、灰尘,接线柱脏污或热电阻短路。
显示无穷大:热电阻或引出线断路,及接线端子松开。
显示负值:接线错误,或热电阻短路。
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