| 摘要 |
A test assembly for automatically testing and diagnosing digital printed-circuit boards has a driver circuit for supplying a stimulus pulse to the circuit board to be tested, a sensor circuit for detecting the output from the circuit board in response to the stimulus pulse, a program for directing the testing operation of the test assembly, an input device such as a keyboard for entering instructions including the program to the test assembly, and an output device such as a printer for displaying the results of the test operation. The test assembly also includes a sense and hold circuit interconnected with the driver circuit, the sensor circuit and the circuit board, which senses the output pulses from the circuit board in response to the stimulus pulse, and provides an input pulse to the sensor circuit having a period greater than the minimum duration period capable of being detected by the sensor circuit.
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