SU429268A1 - DEVICE FOR MEASURING THE DEPENDENCE OF MAGNETIC TAPE DEFORMATION ON ITS TENSION - Google Patents

Description

one

The invention relates to the field of measurement technology, in particular, to devices for measuring the dependence of the deformation of a magnetic tape on its tension.

A device for measuring the dependence of the deformation of a magnetic tape on its tension is known, containing a phase discriminator connected to a recorder connected through an amplifier to a strain gauge placed between magnetic heads connected through switches and other amplifiers with filters. In addition, the device comprises a frequency divider, a phase-shifting circuit, a frequency multiplier, a pulse shaper, and a sinusoidal voltage generator. However, this device introduces significant errors in the measurement result.

The aim of the invention is to reduce measurement errors. For this, the filters are connected to the inputs of the phase discriminator via a frequency divider and phase-shifting circuit, and the sinusoidal voltage generator is connected to one switch and connected through a frequency multiplier and pulse driver to another switch.

The drawing shows a block diagram. the proposed device.

It contains magnetic heads 1 and 2 mated with magnetic tape 3 moving past. Magnetic head 1 is connected to one of the inputs of phase discriminator 4 through switch 5, amplifier 6, high-pass filter 7 and frequency divider 8. Magnetic head 2 is connected to another input of phase discriminator 4 through switch 9, amplifier 10, resonant filter And and phase-shifting circuit 12. Phase discriminator 4 is connected to recorder 13 connected

with the counter-node 14. The recorder 13 is also connected through an amplifier 15 to a strain gauge 16, located between the magnetic heads 1 and 2 and mated with magnetic tape 3.

The proposed device also contains a sinusoidal voltage generator 17, the output of which is connected directly to the switch 9. The output of the generator 17 is also connected to the switch 5 via a frequency multiplier 18 and a driver 19 pulses.

The device works as follows. On the moving magnetic tape 3, sinusoidal and pulsed signals are recorded,

for which switches 9 and 5 connect generator 17 to magnetic head 2 and pulse generator 19 to magnetic head 1. After this, the recorded signals are reproduced and their phase ratio characterizing the deformation of magnetic tape 3 is measured. The measurement result of this phase relation is recorded together with the load cell signal 16 by means of the recorder 13. The signals recorded by the recorder 13 are then analyzed by the counting unit 14.

Subject invention

A device for measuring the dependence of the deformation of a magnetic tape on its tension, containing its phase discriminator connected to a recorder connected through an amplifier to a strain gauge placed

between magnetic heads connected via switches and other amplifiers with filters, a frequency divider, a phase-shifting circuit, a frequency multiplier, a pulse shaper, and a sinusoidal voltage generator, distinguished by the fact that the frequency divider and phase shift; the th center value; and the sinusoidal voltage generator is connected to one switch and connected through a frequency multiplier and pulse driver to another switch.