SU1264107A1 - Device for measuring oscillatory system q-factor - Google Patents

Abstract

The invention relates to the field of automatic measurement of electrical circuit parameters. The purpose of the invention is to increase measurement accuracy. The device comprises a shock excitation circuit 1, a detector 2, threshold blocks 3, 4, 5 and 6, integrating circuits 7 and 8, an anti-coincidence unit 9, a time interval imager 10, a coincidence element 11, a counter 12 and a stable frequency pulse generator 13. Instead of an integrator with a controlled voltage source in the device, a controlled oscillator 16 is used with a meter 17 of the measurement result. The frequency of the controlled oscillator 16 is proportional to the natural frequency, and the counting time is proportional to the constant envelope time. To stabilize the frequency of the controlled oscillator, a reference channel is inserted into the device containing a generator frequency divider 14. Pulses 13. s @ Accuracy of the proposed device (L practically depends on the stability of the generator 13 stable frequency pulses. When using a quartz oscillator even without thermostating, the accuracy of the proposed Device is much higher than to the base object. 1 Il.

Description

The invention relates to the field of automatic measurement of electrical circuit parameters and can be used in measuring devices and automatic control systems.

The purpose of the invention is to improve the measurement accuracy.

The drawing shows a structural diagram of the proposed device.

The device contains a shock excitation circuit 1, a detector 2, the first threshold unit 3, the third threshold unit 4, the second threshold unit 5, the fourth threshold block 6, the second integrating circuit 7, the first integrating circuit 8, the anti-coincidence unit $ shaper of the time interval the first element 11 matches, the counter 12, the generator 13 pulses of a stable frequency, the frequency divider 14, the second element 15 matches, the controlled generator 16, the second counter 17.

The output of the shock excitation circuit 1 is connected. with the input of the detector 2 and shaper 10 upei ieuiioro interval. Two detector B111s are connected to the inputs of two noporoBiJX channels, the first of which includes the first 1X15OG block 3, the first integrating circuit 8, the second threshold block 5, BTopoii concludes the third threshold block 4, the second integrating circuit 7, the fourth THMii serially block 6. The outputs of the threshold channels are connected to the inputs of block 9 of the anti-fallout circuit. Vykody shaper 10 time interval and the generator 13 and the number of stable frequency connections of the processor. with the input of the first element 1 1 match. The output of the coincidence element 11 is connected to the input of the sensor 12. The input of the frequency divider 14 is connected to the EE 1 input of the generator 13 with a stable frequency pulse, and the output to the reference input of the controlled generator 16, the second input of which is connected to the output of the counter 12. The first and second inputs of the second element 15 the matches are connected respectively to the output of the anti-coincidence unit 9. And the output of the controlled generator 16 of the second coincidence element is connected to the input of the second counter 17.

The device works as follows.

In the shock excitation circuit 1, damped oscillations are excited and

they are detected by detector 2. The first 3 and third 4 threshold blocks are tuned to different levels of comparison. A series of rectangular pulses are formed at their outputs.

constant amplitude, the number of which depends on the levels of comparison and constant attenuation time T. Pulse sequences from threshold blocks 3 and 4 are sent to the first 8

and the second 7 are integrated circuits, respectively. Integrating circuits 7 and 8 are designed to receive a pulse whose duration is equal to the duration of the input sequence.

pulses. The pulses from the outputs of the integrating circuits are fed to the second 5 and fourth 6 threshold blocks, which have the same level of comparison. Pa outputs of threshold blocks 5 and 6

rectangular pulses of a CONSTANT amplitude of duration 1 and are formed, which are fed to the inputs of the anti-coincidence unit 9. The coincidence unit 9 generates a pulse of duration T, equal to the difference Ij-t,

Thus, the first channel of the meter, which includes the detector 2, blocks 3-6, circuits 7 and 8, and block 9, forms the time interval t, nponopu ional constant of the decay time.

The second measuring channel, which includes the imaging unit 10, element 11,

counter 12, generator 13, divider 14, generator 16, generates a signal; l, frequency f. which is proportional to the natural frequency of the oscillating system. The channel works as follows. The damped oscillations are fed to the input of the time generator 10, which, by counting a given number n and the signal periods from the shock excitation circuit, forms the time interval I ,, proportional to the period of the self oscillation. The first element 11 matches during the time interval 7 passes to the input

Claims (1)

counter -12 stable frequency pulses from a generator of 13 pulses. The number of these pulses, and, consequently, the code in the counter 12, is inversely 3 proportional to the natural frequency: M, O-, Controlled oscillator 16, stabilized by the reference frequency from the 14 frequency divider, output the signal whose frequency is inversely proportional to the code C - - N, The signal from the output of the controlled oscillator 16 is fed to the input of the second 15 coincidence element and during the interval T, is fed to the second counter 17, recording the main result of the measurement. The number of pulses transmitted to counter 17, and, therefore, the codeN recorded in it, are equal. From the formula it follows that the code in the second counter is proportional to the quality factor of the oscillating system. Claims An apparatus for measuring the quality factor of oscillatory systems, comprising a shock excitation circuit, a detector, the input of which is connected to the output of the shock excitation circuit, a first threshold unit, the input of which is connected to the first output of the detector, the first integrating circuit. 107 which is connected to the output of the first threshold unit, the second, threshold unit, the input of which is connected to the output of the first integrating circuit, the third threshold unit, the input of which is connected to the second detector output, the second integrating circuit, the input of which is connected to the output of the third threshold unit, a quarter threshold unit, the input of which is connected to the output of the second integrating circuit, anti-coincidence unit, the first input of which is connected to the output of the second threshold unit, and the second input is connected to the output of the fourth threshold unit, f Timer trimmer, the input of which is connected to the output of the shock excitation circuit, a stable frequency pulse generator, the first match element, the first input of which is connected to the output of the time interval generator, and the second input is connected to the output of the stable frequency pulse generator, a counter, input which is connected to the output of the first oh, the lemme coincidence, about 10 and so on, so that, in order to improve the measurement accuracy, a frequency divider, a control generator, the second coincidence element and a second counter, the deltel frequency input is connected to the output of a stable frequency pulse generator, the first input of the controlled generator is connected to the counter output, and the second is connected to the output of a frequency divider, the first input of the second coincidence element is connected to the output of the anti-coincidence unit, the second from the output of the controlled generator, and the output is connected to the input of the second counter.