Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Reexamination Certificate
2007-02-23
2009-06-23
Dole, Timothy J (Department: 2831)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
C324S763010, C324S713000
Reexamination Certificate
active
07550976
ABSTRACT:
A measurement apparatus is provided for measuring at least one of the switching times of the output signals output from a device under test. The measurement apparatus comprises: a first light-emitting unit having a function whereby light emission starts in a case that the voltage of the output signal becomes equal to or greater than a first threshold voltage; a second light-emitting unit having a function whereby light emission starts in a case that the voltage of the output signal becomes equal to or greater than a second threshold voltage that is higher than the first threshold voltage; a first light reception unit which receives light emitted from the first light-emitting unit; a second light reception unit which receives light emitted from the second light-emitting unit; and a measurement unit which measures the switching time required for the voltage to switch between the first threshold voltage and the second threshold voltage, based upon at least one of the difference in the light-emission start timing and the difference in the light-emission stop timing between the first light-emitting unit and the second light-emitting unit.
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International Search Report issued in International Application No. PCT/JP2007/052466 mailed on May 15, 2007, 3 pages.
Advantest Corporation
Dole Timothy J
Natalini Jeff
Osha • Liang LLP
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