calibration trace

In this paper a new method for detection of pollution trace gases with laser mass spectrometry is presented and the calibration procedure is also given.

Rigaku 3080e3 X-ray spectrometer was applied to the determination of major and trace mineral elements in muskmelon, calibration was made by using national plant standard reference materials.

It can be obtained the trace to the source of large direct current with self-balancing DC comparator through self-calibration circuit, addition circuit, compare circuit and multiplication circuit etc.