Patent ID: 7463173

Claim:
A charged particle beam apparatus comprising: a plurality of digital-analog (DA) converter units configured to input digital signals, convert the digital signals into analog values, and amplify the analog values to output the analog values; a deflector configured to input at least one analog value of the plurality of analog values output from the plurality of DA converter units to deflect a charged particle beam; and a judging unit configured to judge that at least one of the plurality of DA converter units is abnormal by using the plurality of analog values output from the plurality of DA converter units, wherein the charged particle beam apparatus comprises: as the plurality of DA converter units, a first digital-analog (DA) converter unit configured to input a digital signal for deflecting the charged particle beam, converts the digital signal into a first analog value, and amplifies the first analog value to output the first analog value to the deflector; a second DA converter unit configured to input a plus-minus reversed signal obtained by reversing a polarity of the digital signal in synchronism with the digital signal, converts the plus-minus reversed signal into a second analog value, and amplifies the second analog value to output the second analog value, and the judging unit judges that at least one of the first and second DA converter units is abnormal by using the output first analog value and the output second analog value.