| 摘要 |
PURPOSE:To make it possible to discriminate trouble even in case a value on the positive electrode side or on the negative electrode side of a tube voltage is deviated, by outputting a trouble discrimination signal while comparing the absolute values of errors of both positive and negative components of X-ray tube voltage from an error amplifying circuit with a reference voltage. CONSTITUTION:An error amplifying circuit 17 takes the outputs 20 and 21 of a tube voltage detection circuit into an operation amplifier OP1 through resistances R5 and R6. The error amplifying outputs are inputted into an absolute value operation circuit 18 to output absolute values of errors of both positive and negative components into a comparator circuit 23. The circuit 23 sends out a trouble discrimination signal to an X-ray control circuit through a delay circuit 24 consisting of a resistance 14 and a capacitor C, a resistance 15 and a transistor Tr after comparing output potentials of the circuit 18 with a reference potential.
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