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R3755A/R3760當(dāng)遇到問題后，就能確定選用什么類型的傳感器，然后再考慮以下問題。
    ①靈敏度。傳感器的靈敏度越高，可以感知越小的變化量，即被測量稍有微小變化時，傳感器即有較大的輸出。但靈敏度越高，與測量信號無關(guān)的外界噪聲也容易混入，并且噪聲也會被放大。因此，要求傳感器有較大的信噪比。
    傳感器的量程是和靈敏度緊密相關(guān)的一個參數(shù)。當(dāng)輸入量增大時，除非有專門的非線性校正措施，傳感器不應(yīng)在非線性區(qū)域工作，更不能在飽和區(qū)域工作。有些需在較強的噪聲干擾下進(jìn)行的測試工作，被測信號登加干擾信號后，也不應(yīng)進(jìn)入非線性區(qū)。因此，過高的靈敏度會影響其使用的測量范圍。
    若被測量是一維向量時。則傳感器在被測量方向的靈敏度愈高愈好，而橫向靈敏度越小越好;若被測量是二維或三維向量，則對傳感器還應(yīng)要求交又靈敏度越小越好。
 
    ②響應(yīng)特性。傳感器的響應(yīng)特性必須在所測頻率范圍內(nèi)盡量保持不失真。但實際傳感器的響應(yīng)總有一些延遲，但延遲時間越短越好。
    一般光電效應(yīng)、壓電效應(yīng)等物性型傳感器響應(yīng)時間短，工作頻率范圍寬。而結(jié)構(gòu)型，如電感、電容、磁電式傳感器等，由于受到結(jié)構(gòu)特性的影響和機械系統(tǒng)慣性的限制，其固有頻率較低。
在動態(tài)測量中，傳感器的響應(yīng)特性對測試結(jié)果有直接影響，在選用時，應(yīng)充分考慮到被測物理量的變化特點(如穩(wěn)態(tài)、瞬變、隨機等)。
 
    ③穩(wěn)定性。傳感器的穩(wěn)定性是經(jīng)過長期使用以后，其輸出特性不發(fā)生變化的性能。傳感器的穩(wěn)定性有定量指標(biāo)，超過使用期，應(yīng)及時進(jìn)行標(biāo)定。影響傳感器穩(wěn)定性的因素主要是環(huán)境與時間。
在工業(yè)自動化系統(tǒng)或自動檢測系統(tǒng)中，傳感器往往是在比較惡劣的環(huán)境下工作，灰塵、油污、溫度、振動等干擾是很嚴(yán)重的，這時傳感器的選用，必須優(yōu)先考慮穩(wěn)定性因素。
 

    ④精度。傳感器的精度表示傳感器的輸出與被測量的對應(yīng)程度。因為傳感器處于測試系統(tǒng)的輸入端，因此，傳感器能否真實地反映被測量，對整個測試系統(tǒng)具有直接影響。然而，傳感器的精確度并非越高越好，還要考慮到經(jīng)濟(jì)性。傳感器精度越高，價格越昂貴，因此，應(yīng)該從實際出發(fā)來選擇。首先應(yīng)了解測試目的，是定性分析，還是定量分析。如果屬于相對比較性的試驗研究，只需獲得相對比較值即可，那么對傳感器的精確度要求可低些。然而，對于定量分析，因為必須獲得精確量值，所以要求傳感器應(yīng)有足夠高的精確度。

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