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使用頻譜分析儀的注意事項

2021年08月13日 15:25人氣:1814

  頻譜分析儀是研究電信號頻譜結構的儀器,用于信號失真度、調制度、譜純度、頻率穩定度和交調失真等信號參數的測量,可用以測量放大器和濾波器等電路系統的某些參數,是一種多用途的電子測量儀器。頻譜分析儀的價格相對昂貴,一旦損壞,相應的維護費用就比較高,維護周期也比較長,如何正確的使用頻譜分析儀就格外重要。
 
  1、電源對于頻譜分析儀非常重要。在打開頻譜分析儀的電源之前,請確保電源已正確連接并且接地線已可靠接地。頻譜分析儀配有三芯電源線,在啟動機器之前,必須將電源線的插頭插入標準的三相插座中,切勿使用沒有保護性接地線的電源線,以免造成人身傷害。
 
  2、在準確測量信號之前,頻譜分析儀應在打開后預熱30分鐘。當測試環境溫度變化3-5度時,應重新校準頻譜分析儀。
 
  3、任何頻譜分析儀的輸入端口都具有允許的大MAX安全功率,這稱為MAX輸入電平。例如,家用多功能頻譜分析儀AV4032要求連續波輸入信號的大功率不能超過+ 30dBmW(1W),并且不允許直流輸入。 如果輸入信號值超過頻譜分析儀允許的大輸入電平,將損壞儀器。 對于不允許直流輸入的頻譜分析儀,如果輸入信號包含直流分量,也會對頻譜分析儀造成損壞、損傷。
 
  4、通用頻譜分析儀的大輸入電平值通常在輸入連接器附近的前面板上標記。如果頻譜分析儀不允許信號包含直流電壓,則在使用直流分量測量信號時,應使用適當值的外部電容器來阻止直流。
 
  5、如果無法很好地理解所測量信號的性質,則可以使用以下方法來確保頻譜分析儀的安全使用:如果有RF功率計,則可以先使用它來測量信號電平;如果沒有功率計,則應在信號電纜和頻譜分析儀的輸入端之間連接一定量的外部衰減器。頻譜網絡分析儀應選擇大RF衰減和可能的大參考電平,并使用較寬的頻率跨度(SPAN),以確??梢郧宄乜吹娇赡芷x屏幕的信號。我們還可以使用示波器,電壓表和其他儀器來檢查DC和AC信號電平。
 
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