Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1998-02-27
1999-10-19
Do, Diep N.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324523, 324754, G01R 3102
Patent
active
059695307
ABSTRACT:
An inexpensive and reliable circuit board inspection apparatus and method requires only a short inspection time and is applicable to a densely wired circuit board. A constant voltage E is applied to a switch section SW1 from a signal source 46. A computer 44 turns on a switch section SW2 and then turns the switch section SW1 on. An equivalent circuit is then closed to cause a current (i) to flow therethrough, thereby generating a voltage Vx that is input to an amplifier 74. After the voltage Vx has been amplified by the amplifier 74, its maximum value is detected and held by a peak hold circuit 76. Based on the maximum value, the computer 44 determines the continuity of a printed pattern on a circuit board 32. The voltage Vx input to the amplifier 74 exhibits the maximum value nearly simultaneously with the activation of the switch section SW1. Thus, detection of the maximum value and continuity of the printed pattern can be determined in a very short time.
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Do Diep N.
Nidec-Read Corporation
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