Test system for detecting a permanent defect and a temporary def

Details Test system for detecting a permanent defect and a temporary def Test system for detecting a permanent defect and a temporary def

1979-05-23

1982-04-06

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

307471, G01R 3312, G01N 2782, H03K 522

Patent

active

043238440

ABSTRACT:
A system for testing magnetic tape comprising a pair of magnetic head assemblies positioned at a fixed length along the path of magnetic recording tape. A read-out signal of the first magnetic head is delayed by a delay circuit by time t=l/V, where l is the length between the first magnetic head and the second magnetic head, and V is the tape feeding speed. A logical AND circuit and a logical exclusive-OR circuit are provided for receiving the output of the delay circuit and the read-out signal of the second magnetic head. When the AND circuit provides an output signal, it is recognized that both the first and second magnetic heads have sensed a permanent defect. When the exclusive-OR circuit provides an output signal, it is recognized that either the first magnetic head or second magnetic head has sensed a temporary defect. Accordingly, both a permanent defect and a temporary defect are detected by running magnetic tape only once in a predetermined direction.

REFERENCES:
patent: Re24641 (1959-04-01), Reynolds
patent: 2580934 (1952-01-01), Love et al.
patent: 2870430 (1959-01-01), Hancock
patent: 3466535 (1969-09-01), Sterns et al.
patent: 3586965 (1971-06-01), Whysong et al.
patent: 3755731 (1973-08-01), Young
patent: 3803425 (1974-04-01), Carp
patent: 4038596 (1977-07-01), Lee
patent: 4127813 (1978-11-01), Hiroshima et al.
patent: 4207534 (1980-06-01), Miille

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