一般情况下，可以由相机来测定整个画面的光线亮度，并确定最佳曝光量。
In general, the camera to determine the whole picture of the radial brightness, and the optimum exposure.
定量加入内标，利用火花源质谱单曝光法测定杂质元素。
Internal standard is added, impure elements are determined by spark source mass spectrometry single exposure method.
要改变当前曝光测定设置，在重复第1 - 2步。
To change the current exposure metering setting, repeat steps 1 and 2 again.
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