Tijaabada TDR waxaa hadda inta badan lagu isticmaalaa PCB-ga soo saarayaasha guddiga wareegga batteriga ( looxyada wareegyada daabacan ) xadhkaha signalada iyo tijaabinta impedance qalab. Waxaa jira sababo badan oo saameeya saxnaanta imtixaanka TDR, gaar ahaan milicsiga, jaangooynta, xulashada akhrinta, iwm. Milicsigu waxay keeni doontaa leexleexyo halis ah qiimaha tijaabada ee khadka gaaban ee PCB, gaar ahaan marka TIP (baaritaan) loo isticmaalo baaritaanka.Sida iska cad, sababtoo ah TIP iyo barta xidhiidhka ee khadka signalka ayaa sababi doona joojin wayn, taasoo keenaysa milicsi inay dhacdo, oo keenaysa qalooca cidhiidhiga ah ee khadka signalka PCB inuu ku beddelo agagaarka ilaa saddex ama afar inji.
Sawir: ENIG immersion 4 lakabka maaskaro alxanka buluuga ah FR4
Sida khadadka signalada hal-dhamaadka ah, xadhkaha calaamadaha kala duwan, isku xidhayaasha, iwm. Imtixaanka noocan ahi waxa uu leeyahay shuruud, kaas oo ah in lagu daro shuruudaha codsiga dhabta ah.Tusaale ahaan, cidhifka dhabta ah ee kor u kaca xariiqda calaamada ee xariiqda calaamaduhu waa qiyaastii 300ps, ka dibna cidhifka kor u kaca ee TDR wax soo saarka calaamadda garaaca wadnaha waa in la dejiyaa si u dhiganta 300ps halkii 30ps.Cidhifyada u kacaya bidix iyo midig, haddii kale natiijadu waxay ka duwanaan kartaa codsiga dhabta ah. 
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