Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Identifying or correcting improper counter operation
Patent
1988-10-11
1990-08-14
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Identifying or correcting improper counter operation
328149, 340653, 324787, 307360, 307512, G01R 2302, H03K 2140
Patent
active
049493647
ABSTRACT:
A count error detecting device for count type measuring instruments is provided with a phase-shift circuit producing two N phase interpolation signals shifted in phase by 45.degree. from two signals in phase by 90.degree. each other; a plurality of comparators converting the two N phase interpolation signals into pulse signals; a pair of coincidence circuits connected to the comparators; a pulse discriminator circuit connected to the coincidence circuits; a counter circuit connected to the pulse discriminator circuit; and a flip-flop connected to one of the coincidence circuits and the pulse discriminator circuit. Thus, a circuit configuration of the device is facilitated, the ability of a detector can be fully displayed, and measurement efficiency can be widely improved. A conventional count error detecting circuit may be connected to the count error detecting device as an alarm circuit.
REFERENCES:
patent: 4031464 (1977-06-01), Norberg
patent: 4529892 (1988-07-01), Reilly et al.
patent: 4574206 (1986-03-01), Todokoro et al.
Heyman John S.
Olympus Optical Co,. Ltd.
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