方法四：記錄比較法

cifangfatongyangshiyongyusuoyouleixingdegaoyazhengqimiejunqi
，caozuoyaodiantongshishibijiaofa。biaozhunqicaiyongjilushiyaliwuxianceliangxitong，qijishuzhibiaoyaoqiububian。yushishibijiaofasuocaiyongdebiaozhunqixiangbi
，qitijigengxiao

，shiyongyugengxiaodegongzuokongjian，danjilushiqueshaoshishiceliangshujuchuanshugongneng，wufazhunquezhangwoxiaozhunguocheng，zhinengbeidongjieshoujilujieguo。weishiceliangjieguokekao

，changxuyanchangxiaozhunshijian
，huodangxiaozhunjieguobushenmanyishi，changxujinxingduocicaozuoyihuodezuijiaxiaozhunjieguo。xiaozhunjieguochulitongyangangongshi（2）。

ΔP = Pa-Pn 　　　　（2）

式中：

ΔP-被校壓力指示儀表示值誤差

，kPa
；

Pa-被校壓力指示儀表示值讀數平均值
，kPa
；

Pn-標準器示值讀數平均值
，kPa。