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電位器
由于脈沖電位器在工作過程中有三種情形：一是沒有被旋轉(zhuǎn)而停留在某一狀態(tài)（位置）；二是雖然被旋轉(zhuǎn)但沒有完成一個(gè)周期（4個(gè)狀態(tài)）而停留在某一狀態(tài)；三是不停地被旋轉(zhuǎn)而超過一個(gè)周期。狀態(tài)（位置）采樣法就是要準(zhǔn)確地跟蹤識(shí)別和記錄脈沖電位器變化的每一個(gè)狀態(tài)值（包括位置值和它對(duì)應(yīng)的特征碼）。程序一開始就要識(shí)別出脈沖電位器所處的現(xiàn)態(tài)位置和其對(duì)應(yīng)的特征碼；隨后不斷跟蹤掃描記錄脈沖電位器的每一變化過程。顯然，脈沖電位器只有旋轉(zhuǎn)到第4個(gè)狀態(tài)才有一個(gè)我們所需要的特征碼出現(xiàn)，程序根據(jù)這個(gè)特征碼的性質(zhì)再對(duì)音量進(jìn)行加減控制。
符合度  聽語(yǔ)音
符合度又叫符合性，它是指電位器的實(shí)際輸出函數(shù)特性和所要求的理論函數(shù)特性之間的符合程度。它用實(shí)際特性和理論特性之間的大偏差對(duì)外加總電壓的百分?jǐn)?shù)表示，可以代表電位器的精度。
分辨力  聽語(yǔ)音
分辨力決定于電位器的理論精度。對(duì)于線繞電位器和線性電位器來說，分辨力是用動(dòng)觸點(diǎn)在繞組上每移動(dòng)一匝所引起的電阻變化量與總電阻的百分比表示。對(duì)于具有函數(shù)特性的電位器來說，由于繞組上每一匝的電阻不同，故分辨力是個(gè)變量。此時(shí)，電位器的分辨力一般是指函數(shù)特性曲線上斜率大一段的平均分辨力。
滑動(dòng)噪聲  聽語(yǔ)音
滑動(dòng)噪聲是電位器特有的噪聲。在改變電阻值時(shí)，由于電位器電阻分配不當(dāng)、轉(zhuǎn)動(dòng)系統(tǒng)配合不當(dāng)以及電位器存在接觸電阻等原因，會(huì)使動(dòng)觸點(diǎn)在電阻體表面移動(dòng)時(shí)，輸出端除有有用信號(hào)外，還伴有隨著信號(hào)起伏不定的噪聲。
對(duì)于線繞電位器來說，除了上述的動(dòng)觸點(diǎn)與繞組之間的接觸噪聲外，還有分辨力噪聲和短接噪聲。分辨力噪聲是由電阻變化的階梯性所引起的，而短接噪聲則是當(dāng)動(dòng)觸點(diǎn)在繞組上移動(dòng)而短接相鄰線匝時(shí)產(chǎn)生的，它與流過繞組的電流、線匝的電阻以及動(dòng)觸點(diǎn)與繞組間的接觸電阻成正比。
機(jī)械壽命  聽語(yǔ)音
電位器的機(jī)械壽命也稱磨損壽命，常用機(jī)械耐久性表示。機(jī)械耐久性是指電位器在規(guī)定的試驗(yàn)條件下，動(dòng)觸點(diǎn)可靠運(yùn)動(dòng)的總次數(shù)，常用 "周"表示。機(jī)械壽命與電位器的種類、結(jié)構(gòu)、材料及制作工藝有關(guān)，差異相當(dāng)大。
除了上述的特性參數(shù)外，電位器還有額定功率、阻值允許偏差、大工作電壓、額定工作電壓、緣電壓、溫度參數(shù)、噪聲電動(dòng)勢(shì)及高頻特性等參數(shù)，這些參數(shù)的意義與電阻器相應(yīng)特性參數(shù)的意義相同。
分類  聽語(yǔ)音
組成電位器的關(guān)鍵零件是電阻體和電刷。根據(jù)二者間的結(jié)構(gòu)形式和是否帶有開關(guān)，電位器可分為幾種類型。電位器還可按電阻體的材料分類，如線繞、合成碳膜、金屬玻璃釉、有機(jī)實(shí)芯和導(dǎo)電塑料等類型，電性能主要決定于所用的材料。此外還有用金屬箔、金屬膜和金屬氧化膜制成電阻體的電位器，具有特殊用途。電位器按使用特點(diǎn)區(qū)分，有通用、、高分辨力、高阻、高溫、高頻、大功率等電位器；按阻值調(diào)節(jié)方式分則有可調(diào)型、半可調(diào)型和微調(diào)型，后二者又稱半固定電位器。 為克服電刷在電阻體上移動(dòng)接觸對(duì)電位器性能和壽命帶來的不利影響，又有無(wú)觸點(diǎn)非接觸式電位器，如光敏和磁敏電位器等，供少量特殊應(yīng)用。


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