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鑄鐵平板制造和修理過程中，由于材質的硬度和均勻性、溫度變化、刮制技術、研磨劑的質量、研磨力的分布、嵌砂的均勻性、合研的穩定性等影響，都會使平板產生局部平面度誤差；使用中的平板也會由于局部磨損、劃痕、碰傷和局部溫度變化產生局部平面度誤差。因此對平板局部平面度的檢定很有要。
為了保證以(yi)有(you)限點取值(zhi)的檢(jian)(jian)(jian)定(ding)(ding)(ding)(ding)方法(fa)能夠真(zhen)(zhen)實地反映整(zheng)(zheng)塊(kuai)平(ping)(ping)(ping)(ping)板(ban)(ban)(ban)平(ping)(ping)(ping)(ping)面(mian)(mian)(mian)度誤差狀況，滿足該法(fa)建立在(zai)平(ping)(ping)(ping)(ping)板(ban)(ban)(ban)工作面(mian)(mian)(mian)的凹(ao)凸(tu)變化處平(ping)(ping)(ping)(ping)緩光滑的前(qian)提(ti)條件下，否則檢(jian)(jian)(jian)定(ding)(ding)(ding)(ding)結(jie)果(guo)(guo)將是不(bu)真(zhen)(zhen)實和無意義(yi)的。以(yi)檢(jian)(jian)(jian)定(ding)(ding)(ding)(ding)1500*1000mm平(ping)(ping)(ping)(ping)板(ban)(ban)(ban)為例，它是以(yi)8個(ge)截面(mian)(mian)(mian)、25個(ge)測點計(ji)算出整(zheng)(zheng)個(ge)平(ping)(ping)(ping)(ping)板(ban)(ban)(ban)平(ping)(ping)(ping)(ping)面(mian)(mian)(mian)度值(zhi)的，而這些點組成的16塊(kuai)370mm*250mm長方形(xing)空(kong)間區(qu)(qu)未予以(yi)考慮，有(you)可能其(qi)平(ping)(ping)(ping)(ping)面(mian)(mian)(mian)度的高(gao)低(di)點在(zai)其(qi)空(kong)間區(qu)(qu)內，人們難(nan)免要(yao)(yao)懷疑其(qi)檢(jian)(jian)(jian)定(ding)(ding)(ding)(ding)結(jie)果(guo)(guo)的真(zhen)(zhen)實性(xing)。由此可見(jian)局(ju)(ju)部(bu)平(ping)(ping)(ping)(ping)面(mian)(mian)(mian)度的檢(jian)(jian)(jian)定(ding)(ding)(ding)(ding)對(dui)于控制(zhi)(zhi)平(ping)(ping)(ping)(ping)板(ban)(ban)(ban)微觀質量至關重(zhong)要(yao)(yao)。作為一種(zhong)補充，對(dui)檢(jian)(jian)(jian)定(ding)(ding)(ding)(ding)點以(yi)外的空(kong)白區(qu)(qu)再進行局(ju)(ju)部(bu)平(ping)(ping)(ping)(ping)面(mian)(mian)(mian)度檢(jian)(jian)(jian)定(ding)(ding)(ding)(ding)，才能對(dui)整(zheng)(zheng)塊(kuai)被(bei)檢(jian)(jian)(jian)平(ping)(ping)(ping)(ping)板(ban)(ban)(ban)工作面(mian)(mian)(mian)平(ping)(ping)(ping)(ping)面(mian)(mian)(mian)度做出正確(que)的評價。所以(yi)把局(ju)(ju)總(zong)平(ping)(ping)(ping)(ping)面(mian)(mian)(mian)度的檢(jian)(jian)(jian)定(ding)(ding)(ding)(ding)視為控制(zhi)(zhi)平(ping)(ping)(ping)(ping)板(ban)(ban)(ban)微觀質量的youxiao方法(fa)，平(ping)(ping)(ping)(ping)板(ban)(ban)(ban)整(zheng)(zheng)體平(ping)(ping)(ping)(ping)面(mian)(mian)(mian)度檢(jian)(jian)(jian)定(ding)(ding)(ding)(ding)的要(yao)(yao)補充和前(qian)提(ti)條件是不(bu)可忽(hu)略的。