1.儀(yi)器(qi)井(jing)下(xia)精(jing)確(que)定(ding)位(wei)問(wen)題(ti)。由(you)於(yu)儀(yi)器(qi)本(ben)身(shen)沒(mei)有(you)深(shen)度(du)定(ding)位(wei)裝(zhuang)置(zhi)，儀(yi)器(qi)下(xia)入(ru)深(shen)度(du)的(de)計(ji)量(liang)是(shi)靠(kao)絞(jiao)車(che)上(shang)的(de)深(shen)度(du)計(ji)數(shu)器(qi)來(lai)完(wan)成(cheng)。深(shen)度(du)計(ji)數(shu)器(qi)計(ji)量(liang)結(jie)果(guo)的(de)精(jing)度(du)不(bu)但(dan)與(yu)計(ji)數(shu)器(qi)本(ben)身(shen)有(you)關(guan)，而(er)且(qie)還(hai)與(yu)工(gong)作(zuo)環(huan)境(jing)有(you)關(guan)。如(ru)果(guo)深(shen)度(du)誤(wu)差(cha)太(tai)大(da)，測(ce)量(liang)結(jie)果(guo)就(jiu)失(shi)去(qu)意(yi)義(yi)。

    2.guanjingbianhuaduiceliangjieguodeyingxiang。tongchangyingyongdedianciliuliangjishizhongxinliusushide，yiqidebiaodingshizaitezhideguandaozhongwanchengde，ruguocelianghuanjingyubiaodinghuanjingbutong，jiuhuichuxianceliangwucha。yineiliushiyiqiweili，ruotazaineijingweiф62mm光油管中標定，在內徑為ф59mm的塗料油管中測量時就會引入15.28%的誤差。這是係統誤差
，因此在儀器測量過程中要實時搞清楚被測管道的內徑，解釋資料時要扣除因管徑變化引起的測量誤差。

    3.儀yi器qi的de標biao定ding問wen題ti。儀yi器qi出chu廠chang時shi是shi用yong清qing水shui標biao定ding的de，若ruo注zhu入ru介jie質zhi改gai為wei汙wu水shui時shi會hui對dui測ce量liang結jie果guo產chan生sheng什shen麼me樣yang的de影ying響xiang，也ye是shi應ying用yong中zhong要yao考kao慮lv的de一yi個ge問wen題ti在zai實shi際ji應ying用yong中zhong，常chang常chang需xu要yao在zai現xian場chang對dui儀yi器qi進jin行xing標biao定ding。

    4.不bu能neng連lian續xu測ce量liang問wen題ti。流liu量liang計ji如ru果guo能neng連lian續xu測ce量liang管guan柱zhu內nei的de流liu動dong剖pou麵mian，就jiu能neng直zhi觀guan地di反fan映ying出chu整zheng個ge井jing筒tong內nei的de吸xi水shui情qing況kuang，這zhe樣yang有you得de於yu測ce井jing資zi料liao的de解jie釋shi。由you於yu結jie構gou設she計ji上shang的de缺que陷xian
，電dian磁ci流liu量liang計ji目mu前qian還hai不bu能neng完wan全quan實shi現xian連lian續xu測ce量liang，有you人ren已yi經jing著zhe手shou解jie決jue這zhe一yi問wen題ti。