SU1622845A1 - Device for automatic measuring of extremum frequences of piezoelectric transducers - Google Patents

Abstract

The invention can be used in automatic systems for controlling parameters of piezo transducers. The purpose of the invention, an increase in productivity, is achieved by automating the measurement process. To do this, in the device, the signal from the output of the oscillator 1 with electronic frequency tuning is fed to the inputs N of four-pole 2., ..., 2N signals from the output of which are fed to the phase comparator 4 through the switch 3 and then to the counting input of the counter 7 of the number of cycles per frequency When overflow occurs, a signal is output to the frequency adjustment counter 8. The code comparator 9 compares the code of the counter, frequency tuning and the maximum frequency register 10, when the output of the comparator 9 codes coincides with the input of the direct count of the element select counter 11, the EXCLUSIVE OR 5 element generates an error signal and sends it to the warning unit 6 by mistake. 1 il. "Ls about to to sp

Description

The invention relates to a measurement technique n intended for use in radio engineering systems, in particular in automatic systems for monitoring parameters of piezoelectric transducers.

The purpose of the invention is to improve the measurement performance and reliability of measurement of extreme frequencies of piezo transducers by automating the measurement process.

The drawing shows a functional diagram of the device.

The device contains a series-connected harmonic oscillator 1 with electronic frequency tuning elements, resistive quadrupoles with measured piezoelectric transducer 24, ..., 2 c, switch 3 of the piezotransducer under test, discrete phase comparator 4, EXCLUSIVE OR 5 element and unit 6 error warnings, serially connected counter 7 of the number of clock cycles at a given frequency, counter 8 automatic frequency tuning, comparator 9 codes and register U of the maximum frequency, as well as A sensor 11 of a selectable element for measuring extreme frequencies, the output of which is connected to the control input of switch 3.

The device works as follows.

At the initial time, counters 7, 8, and 11 are in the zero state, the generator 1 generates the minimum measurement frequency of the piezoelectric transducer 2, and the counter 8 selects the first element for control, and in register 10 contains the code for the maximum frequency of control. The generator 1 begins to produce a control frequency, which is fed to all the piezo transducers being tested 2, thus keeping them all under load. During normal operation of the piezoelectric transducer 2 at a given frequency, the signal from switch 3 is fed to the input of a discrete phase comparator 4, the signal from which is fed to the input of direct counting of counter 7, which counts pulses (this counter allows testing the element for a given frequency for some time) . When the counter 7 is filled, a signal appears at the output of the transfer.

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direct counting of the frequency tuning counter 8, which increases its value by -and, the signals from the outputs of counter 8 arrive at the electronic frequency tuning elements of the generator 1, increasing the frequency, and the input of the code comparator 9, which compares the contents of counter 8 and the contents of register 10 When the codes at the comparator output coincide, a signal appears that sets the counters 7 and 8 to the zero state, and to the counter 11 adds -H, connecting the blind unit for measurement. This completes the measurement of one element and begins the measurement of another element. Thus, the device checks all piezoelectric transducers 24, ..., 2g included in the circuit. The measurement process may be repeated several times. In the event of a failure of the piezoelectric converter 2 at the output of the discrete phase comparator 4, the signal is absent and the EXCLUSIVE OR 5 element generates an error signal, which is fed to the input of block 6, an error warning, records the address of the faulty element 2 and the measurement frequency at which the error occurred, and enters the input of the installation of zero counters 7 and 8 and the input of the direct count of counter 11, increasing its value by +1

Claims (1)

Invention Formula A device for automatic measurement of extreme frequencies of piezoelectric transducers, containing a harmonic oscillator with electronic frequency tuning, the output of which is connected to a resistive quadrupole with terminals for connecting measured piezoelectric transducers, as well as to the first input of the phase comparator, which is different in that measurement and reliability enhancement, a switch of the converter under test, an EXCLUSIVE OR element, an error warning block, The sequence counter is connected to the number of cycles, the automatic frequency tuning counter, a comparator and a register codes maximum frequency, and counter selectable element whose output pod5 16228456 the keys to the first input of the supply unit with the electronic rearrangement of the error message and to the control-frequency input, and the output to the comparative output of the comparator of the test piezo-torus, the inputs of the zero-counting converter. the number of clock cycles and the auto counter is connected to the resistive 5 ”atomic frequency tuning outputs, four-terminal counter with terminals for the sub input of the counter of the selected elec- tion of the subjects of the piezoelectric transducer and the resolution input of the preamplifier block, and the output the second error input, the second input of the phase comparator, the output of which () is connected to the control input is connected to the counting input of the counter and the generator from the electronic cycle of the number of cycles and the first frequency input and output of the counter to the element EXCLUSIVE OR, the second automatic frequency tuning, the input of which is connected to the output of the