SU455372A1 - Device for measuring magnetic bias - Google Patents

Description

one

The invention relates to the field of computer technology and is intended for use in the development and operation of storage devices with magnetic media.

Measuring devices for measuring a magnetic carrier spar are known, containing a signal generator connected through a recording unit to serially connected recording heads, one of which is located on the axis of symmetry, and two on the edges of the magnetic carrier reproduction heads located respectively to recording heads. .x is connected via a playback unit connected in series and a null organ with the first trigger inputs and the time interval gauge, the recording unit and the connected and subsequent additional reproducing unit and iul Org.

However, such devices do not provide high accuracy of work due to the absence of circuit elements and connections in the device, which allow to have a reference channel corresponding to the axis of the engine, almost not subjected to a bias.

The proposed device is characterized in that a switch, a delay unit and a low-pass filter are inputted, the playback heads located along the edges of the magnetic carrier are connected via a switch to the input of an additional eight-piece unit, and the output of the pre-terminal zero-organ is connected to the second inputs of a time meter. itervalov and flip-flop, the output of which is connected to the recording unit through a low-pass filter.

This allows to increase the accuracy of the device.

In the drawing there is a function diagram and a device.

It contains a magnetic nose / interfaced with multichannel blocks of magnetic recording heads 2 and playback 3, with the working gap of the middle of the heads of both blocks aligned along the geometric axis of the carrier (;; for example, of the reproducing head 4). The extreme reproducing heads are the heads 5. The recording heads 6 are connected via the recording unit 6, a signal generator 7 is connected, to the playback heads 5 via the switch, sequentially, the playback unit 9, ilul-gai 10 and the delay unit A connected to the trigger 12 and meter 13 time intervals. The other inputs of the trigger and the meter are connected to the playback and playback head 4 through the playback unit 14 and the null organ 15, and to the trigger output - the low-pass filter 16 and the recording device .17.

The device works as follows.

Block 6 writes to the media with help;

heads 2 is a harmonic or pulse signal from generator 7. This signal is reproduced by the corresponding heads 4 and 5 of the reproduction} П1Я. The signal from the head 4, located) 1st on the axis of symmetry of the carrier, is amplified by the playback unit 9, and the moments of its passage through zero are separated by the zero-body 10. In the // block, the signal is delayed for a specified time interval and in the form of pulses goes to the trigger 12 and meter 13 time intervals. The Sigal from the extreme heads 5 with the aid of the switch 8, and including any of the extreme heads 4, is also reproduced by block 14. The zero-body 75 generates pulses that triggers the trigger 12 and the meter 13 time intervals. The time interval between the pulse signals at the outputs of the zero-organ J5 and the delay unit determines the time equal to the skew value, summed with the known amount of delay. the corresponding movement of it in the absence of a skew. The delay of a signal in one channel allows forming a pulse-modulated sequence at the output of a trigger. The latter is modulated by reducing the skew, separated as an analog filter by the K low-pass filter and fixed by the recording unit 17.

The application of the switch 8 makes it possible to conduct a measurement of the skew of both sides of the magnetic carrier with respect to the axis of symmetry with the same playback unit 9 and, therefore, reveal the skew characteristics of the media of the storage device.

Subject invention

A device for measuring the skew of a magnetic medium, comprising a signal generator connected through a recording unit to serially connected recording heads, one of which is located on the axis of symmetry, and two on the edges of the magnetic nosnel,

5 reproduction heads arranged respectively for recording heads, the middle of which is connected through the replayed sequential unit and the null organ with the first inputs of the trgger and time meter, the recording unit, and the sequentially connected additional replay block and the null organ, characterized in that , in order to improve the accuracy of the device, it contains a switch,

5, a background block and a low-pass filter, with the playback heads located along the edges of the magnetic carrier being connected through a switch to the input of an additional playback unit, and the output of

0 zero-body is connected to the second inputs of the time interval meter and the trigger, the output of which is connected to the recording unit through a low-pass filter.