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PCB設計示波器使用應當注意的幹擾因素

时间：2020-08-16 【转载】阅读

PCB設計示波器使用應當注意的幹擾因素

示波器是很微妙的工具，它並不會顯示你真正想找的東西。示波器總是會顯示些什麽，但有時你卻沒有意識到你所錯過的東西。讓我們來逐一細述。

安裝不當

如果取樣率低于比特或時鍾頻率的三倍，你所看到的輸入信號將是失真的信號。如果輸入信號爲正弦波，你仍會看到一個不錯的正弦波，但實質此正弦波只是輸入信號頻率的一部分。從一點上可以看出存在差錯，那就是正弦波看上去未被觸發。解決方法是啓用峰值探測或包絡模式。

捕獲率不足

你知道某個特定的輸入信號出了問題，因爲輸出信號被毀壞，但是你卻無法看到問題出在哪裏。在異常發生率低以及在波器無法捕獲數據的偶然誤差過程中，就會發生這種情況。解決辦法之一是增加示波器的波形捕獲率。一旦看到間歇故障的特征，就能夠使用選擇的觸發器來捕獲異常。在使用高級觸發器模式下，由于示波器始終處于監視狀態，並且在未探查到異常之前不會觸發，因此能夠捕獲發生的所有間歇故障。

改變被測裝置(DUT)的運行條件

探頭的安裝總是會改變被測裝置的運行環境。有時由于劣化了上升時間和建立/保持時間余量而導致裝置失效。有時由于減少了串

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