| 摘要 |
To provide a DC source drive type portable X-ray fluorescence analyzer having a simple source supply operation. A power supply input section of a DC power supply driven portable X-ray fluorescence analyzer, comprising polarity discrimination means 3 for discriminating the polarity of a DC power supply input to a DC power supply input terminal 1 and a DC power supply input terminal 2, and polarity display means 4 for displaying the polarity of the input DC power according to the output of the polarity discriminating means 3. There is also provided reverse connection protection means 5 for preventing supply of current to a load side when input indicating that the DC power supply has reverse polarity is detected from the polarity discrimination means 3. There is further provided switch means 6 for switching a current path of input current and supplying a correct polarity power supply to a load when input indicating that the DC power supply has reverse polarity is detected from the polarity discrimination means 3.
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