花(hua)崗(gang)巖(yan)(yan)平(ping)(ping)臺(tai)的(de)(de)(de)放置與調整檢定(ding)(ding)(ding)(ding)前(qian)經過(guo)改動(dong)三個支承(cheng)點(dian)高(gao)度(du)(du)，用程度(du)(du)儀將花(hua)崗(gang)巖(yan)(yan)平(ping)(ping)臺(tai)大致調至程度(du)(du)，使(shi)平(ping)(ping)板(ban)(ban)(ban)的(de)(de)(de)負荷平(ping)(ping)均(jun)散布于(yu)各支點(dian)上(shang)(shang)。大平(ping)(ping)板(ban)(ban)(ban)增加的(de)(de)(de)支承(cheng)點(dian)需墊平(ping)(ping)穩，不(bu)可毀壞(huai)程度(du)(du)面(mian)。用程度(du)(du)儀檢定(ding)(ding)(ding)(ding)時(shi)，花(hua)崗(gang)巖(yan)(yan)平(ping)(ping)臺(tai)自身為丈量(liang)基(ji)面(mian)，其放置應(ying)穩定(ding)(ding)(ding)(ding);用自準直(zhi)儀檢定(ding)(ding)(ding)(ding)時(shi)，儀器與平(ping)(ping)板(ban)(ban)(ban)不(bu)在同(tong)一剛體上(shang)(shang)。儀器支架結(jie)實性(xing)尤為重(zhong)要。所以檢定(ding)(ding)(ding)(ding)規(gui)程請(qing)求檢定(ding)(ding)(ding)(ding)場(chang)地應(ying)結(jie)實穩定(ding)(ding)(ding)(ding)，檢定(ding)(ding)(ding)(ding)地點(dian)應(ying)防(fang)止振動(dong)。這(zhe)是由于(yu):工(gong)廠常將小平(ping)(ping)板(ban)(ban)(ban)置于(yu)鉗工(gong)臺(tai)或桌(zhuo)子上(shang)(shang)，結(jie)實穩定(ding)(ding)(ding)(ding)性(xing)差。檢定(ding)(ding)(ding)(ding)人員(yuan)在平(ping)(ping)板(ban)(ban)(ban)左近的(de)(de)(de)走(zou)動(dong)、檢定(ding)(ding)(ding)(ding)工(gong)具在平(ping)(ping)板(ban)(ban)(ban)上(shang)(shang)的(de)(de)(de)挪動(dong)，都會產生不(bu)同(tong)的(de)(de)(de)重(zhong)力，使(shi)平(ping)(ping)板(ban)(ban)(ban)的(de)(de)(de)空間位置發作變化(hua)(hua)，丈量(liang)結(jie)果(guo)不(bu)牢靠。所以檢定(ding)(ding)(ding)(ding)這(zhe)類平(ping)(ping)板(ban)(ban)(ban)時(shi)，平(ping)(ping)板(ban)(ban)(ban)應(ying)移至結(jie)實穩定(ding)(ding)(ding)(ding)的(de)(de)(de)場(chang)地上(shang)(shang)，防(fang)止重(zhong)力變化(hua)(hua)對丈量(liang)結(jie)果(guo)的(de)(de)(de)影(ying)響(xiang)。

注意事項：

◇不能用水(shui)(shui)直接沖(chong)洗。花崗巖平臺(tai)是一種會呼吸的多孔資料，極容(rong)易(yi)吸收水(shui)(shui)分或經由水(shui)(shui)溶解(jie)而浸入污(wu)染。石(shi)材(cai)若(ruo)吸收過多的水(shui)(shui)分及污(wu)染，不可防(fang)止地會形成各種石(shi)材(cai)病變。

◇花崗(gang)巖平臺(tai)均怕酸(suan)堿。酸(suan)常形(xing)成(cheng)(cheng)大理(li)(li)石中(zhong)硫鐵礦物氧化而產生吐黃現象，酸(suan)會合成(cheng)(cheng)花崗(gang)巖平臺(tai)中(zhong)所(suo)含(han)的(de)(de)碳酸(suan)鈣，形(xing)成(cheng)(cheng)外(wai)表被腐蝕情況，堿也會腐蝕大理(li)(li)石中(zhong)長石及石英矽化物結晶(jing)之晶(jing)界形(xing)成(cheng)(cheng)晶(jing)粒剝離的(de)(de)現象。

◇不能掩(yan)蓋(gai)雜(za)物。為(wei)堅持大理石(shi)(shi)量具呼吸順暢(chang)，應防止在石(shi)(shi)材(cai)(cai)(cai)面上長期(qi)掩(yan)蓋(gai)地毯及雜(za)物，否則的石(shi)(shi)材(cai)(cai)(cai)下濕氣無(wu)法經過石(shi)(shi)材(cai)(cai)(cai)毛細孔揮發出來。長時間運用含有酸堿性(xing)的清潔劑會使石(shi)(shi)材(cai)(cai)(cai)外(wai)表光澤盡(jin)失，殘留藥劑會招致日(ri)后石(shi)(shi)材(cai)(cai)(cai)病變。