SU402837A1 - METHOD OF MEASURING THE UNEQUALITY OF MAGNETIZATION OF RECORDING MEDIUM - Google Patents
METHOD OF MEASURING THE UNEQUALITY OF MAGNETIZATION OF RECORDING MEDIUMInfo
- Publication number
- SU402837A1 SU402837A1 SU1735325A SU1735325A SU402837A1 SU 402837 A1 SU402837 A1 SU 402837A1 SU 1735325 A SU1735325 A SU 1735325A SU 1735325 A SU1735325 A SU 1735325A SU 402837 A1 SU402837 A1 SU 402837A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- magnetization
- measuring
- recording medium
- unequality
- carrier
- Prior art date
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- Measuring Magnetic Variables (AREA)
Description
1one
Изобретение относитс к области автоматики и вычислительной техники и предназначено дл использовани при разработке и исследовани запоминаюш,их устройств с магнитным носителем.The invention relates to the field of automation and computer technology and is intended for use in the development and research of memory, their devices with magnetic media.
Известные способы измерени неравномерности намагничивани носител записи,основанные на записи тест-сигнала с последующим воспроизведением сигналов, пропорцнональных величин магнитного потока носител и скорости его изменени , не обладают повышенной точностью ввиду невозможносчи дифференцированно оценивать вли ющие факторы .The known methods for measuring the non-uniformity of magnetization of a recording medium, based on recording a test signal with subsequent reproduction of signals proportional to the magnetic flux of the carrier and the speed of its change, do not have increased accuracy due to the impossibility of a differentiated assessment of the influencing factors.
Отличпем предлагаемого способа вл етс то, что записываемый тест-сигнал образуют в виде суммы двух разночастотных гармоннческих сигналов равного уровн , измер ют при воспроизведении на каждой из частот фазовый сдвиг между сигналами, пропорциональными скорости изменени магнитного потока носител и величине этого потока, и накапливают сигнал, пропорциональный разности измеренных фазовых сдвигов, но длине носител .The difference of the proposed method is that the recorded test signal is formed as a sum of two different-frequency harmonic signals of equal level, measured at reproduction at each frequency, the phase shift between the signals proportional to the rate of change of the magnetic flux of the carrier and the value of this stream, and accumulate the signal proportional to the difference of the measured phase shifts, but the length of the carrier.
Благодар раздельной оценке неравномерности намагничивани , исключа факторы, вли ющие на нестабильность выходного сигНала , повышаетс точность измерени .By separately estimating the non-uniformity of magnetization, eliminating factors affecting the instability of the output signal, the measurement accuracy is improved.
Это осуществл етс при измерении вли ни неравномерности намагничивани не на амплитудную несгабильность отдачи (как это выполн етс в известных способах), а на его фазовую нестабильность.This is done by measuring the effect of magnetization non-uniformity not on the amplitude recoil instability (as is done in the known methods), but on its phase instability.
Способ основан на записи на магнитный носитель сигнала, вл ющегос суммой разночастотных сигналов равного уровн с последующим его воспроизведением комбинированой головкой, реагирующей одновременно на величину потока носител и его скорость изменени . В качестве таких головок могут быть использованы, папрпмер, головкн, в цепи магнитопровода с обмоткой которых устаповлен датчик Холла.The method is based on recording on a magnetic carrier a signal that is the sum of different-frequency signals of the same level with its subsequent reproduction with a combined head that simultaneously reacts to the value of the carrier flux and its rate of change. As such heads, a puller can be used, heads, in the circuit of a magnetic circuit with a winding of which a Hall sensor is installed.
При гармоническом тест-сигнале менаду сигналами, одновременно воспроизведенными индукционнин 11 потокочувствительно головками , возникает фазовым сдвиг, содержащнГ как статическую, так и динамическую составл ющие .With a harmonic test signal, signals that are simultaneously reproduced by induction flux heads, a phase shift occurs, containing both static and dynamic components.
Дицамическа составл юща фазового сдвига вызываетс дифференцирующим эффектом ИНДуКЦИОННО ГОЛОВКИ, ПрОЯВЛйЮЩИМс при нестабильности потока в сердечнике головкн, а фазова нестабильность, вызванна этим эффектом, определ етс двум составл ющими , завнс щи.ми от относительно; неравномерности остаточной намагниченности носител , возникающей в процессе заниси, иThe dicamic component of the phase shift is caused by the differentiating effect of the INDUCTIVE HEAD, which manifests itself at instability of the flow in the core of the head, and the phase instability caused by this effect is determined by two components depending on relative; irregularity of the residual magnetization of the carrier arising in the process of reduction, and
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU1735325A SU402837A1 (en) | 1972-01-07 | 1972-01-07 | METHOD OF MEASURING THE UNEQUALITY OF MAGNETIZATION OF RECORDING MEDIUM |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU1735325A SU402837A1 (en) | 1972-01-07 | 1972-01-07 | METHOD OF MEASURING THE UNEQUALITY OF MAGNETIZATION OF RECORDING MEDIUM |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU402837A1 true SU402837A1 (en) | 1973-10-19 |
Family
ID=20499371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU1735325A SU402837A1 (en) | 1972-01-07 | 1972-01-07 | METHOD OF MEASURING THE UNEQUALITY OF MAGNETIZATION OF RECORDING MEDIUM |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU402837A1 (en) |
-
1972
- 1972-01-07 SU SU1735325A patent/SU402837A1/en active
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