RU2026573C1 - Method for measuring electrical parameters of magnetic heads - Google Patents

Abstract

FIELD: data storage. SUBSTANCE: measuring procedure involves recording of electric signal followed by its reproduction from group of tracks at each of two possible angular velocities of disk affording maximum and minimum linear speeds of tracks. As these tracks wear out, next ones are used until entire surface of disk is used up. EFFECT: improved design.

Description

 The invention relates to the accumulation of information on flexible magnetic disks and can be used in the manufacture of magnetic heads.

 When measuring the electrical parameters of magnetic heads, they usually record electrical signals on a rotating magnetic disk and then reproduce them. Since during the operation of contact magnetic heads in the drive at a constant angular speed of the drive shaft, the linear speed of the magnetic tracks relative to the head will be different, in order to check the parameters of the head at different linear speeds of the tracks, recording and playback of electrical signals are carried out at the discs closest to the center and the most distant magnetic tracks, i.e. at respectively the largest and smallest linear speeds of the magnetic tracks [1]. Due to the constant contact of the tested magnetic heads with a limited number of magnetic tracks, the magnetic layer quickly attaches to these places and the disks fail. In addition, to move the heads from the tracks closest to the center of the disk to more distant ones, a certain time is required, which affects the measurement time.

 The purpose of the invention is to measure the electrical parameters of magnetic heads with the most complete use of the entire surface of the magnetic disk while reducing test time without compromising the reliability of the results.

 For this, in the method of measuring the electrical parameters of magnetic heads, in which electrical signals are recorded on groups of information tracks of a rotating magnetic disk and their subsequent reproduction at the highest and lowest linear speeds of a rotating magnetic disk, the angular speed of rotation of the magnetic disk is set to a variable that provides for each group of tracks the entire information area of the magnetic disk, the required maximum and minimum linear rotational speeds of the magnetic claim.

 In addition, the test time is reduced by the time required to move the head from one extreme zone to another.

 The method is as follows. First, an electrical signal is recorded and then reproduced from a group of tracks (usually about 5 tracks) at each of two possible angular speeds of the disk, providing the greatest and smallest linear speeds of the disc. As a certain number of heads are tested and the magnetic tracks of this group are worn, they switch to other tracks, while changing the angular speed of the disk, etc., until the entire surface of the disk is used.

 To implement changes in the angular velocity of rotation of the disk, widely known in the art means are used, for example, a set of appropriate tuning resistors is introduced into the unit for maintaining a given engine speed, switching which sets the desired speed of rotation of the disk.

 The method allows to obtain significant disk savings (their consumption is reduced by more than 10 times) while reducing test time and ensuring the reliability of the results.

Claims (1)

 METHOD FOR MEASURING ELECTRICAL PARAMETERS OF MAGNETIC HEADS, in which electrical signals are recorded on groups of information tracks of a rotating magnetic disk and their subsequent reproduction at the highest and lowest linear speeds of a rotating magnetic disk, characterized in that the angular velocity of rotation of the magnetic disk is set to a variable that provides for each group tracks of the entire information area of the magnetic disk, the required maximum and minimum linear rotational speeds netic disk.