Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Measuring or testing
Patent
1987-02-11
1988-06-14
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Measuring or testing
377 26, 324 73R, 324423, 324538, G01M 1900, G07C 1100, G01R 3104
Patent
active
047517212
ABSTRACT:
Apparatus and method are disclosed for identifying and measuring random contact interruption events in a circuit interconnection device. A comparator circuit, adapted to be operated at high frequencies, identifies when an interrupt event has occurred. The comparator circuit, as a result of the interruption event, causes a high frequency counter circuit to count clock pulses. The count in the counter circuit is continuously applied to an RAM memory circuit, write-enabled at an addressed memory location. After the interruption event is terminated, the RAM memory circuit is no longer write enabled at the addressed location and the addressed location is changed (incremented) in preparation for the next event. The counter circuit is also reset to zero in preparation for the next interruption event. The number of counts from a clock unit having a known frequency provides the duration of the interruption event. With the use of a clock unit operated at 100 MHz, interrupt events from 10 nanoseconds to 9.99 microseconds can be identified. Because of the frequency at which the testing is performed, the input impedance of the comparator circuit must be matched to the impedance of the circuit interconnection device.
REFERENCES:
patent: 4288687 (1981-09-01), Zinn
patent: 4301360 (1981-11-01), Blair
patent: 4380731 (1983-04-01), Alker
patent: 4517684 (1985-05-01), Fennel
patent: 4670891 (1987-06-01), Salowe et al.
patent: 4697138 (1987-09-01), Morishita et al.
Cray William C.
Digital Equipment Corporation
Heyman John S.
Holloway William W.
Mayes Robert C.
LandOfFree
Apparatus and method for testing contact interruptions of circui does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for testing contact interruptions of circui, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for testing contact interruptions of circui will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-509683