SU1330568A1 - Device for calibration of stroboscopic converter of electric signals - Google Patents

Abstract

A device for calibrating a stroboscopic converter of electrical signals contains a filter (F) 1, 6 low frequencies, an adder 2, F 3, 7 high frequencies, a generator 4. Of a sinusoidal continuous signal, a stroboscopic converter 5, drivers 8, 9 pulses, a key 10 , counter 11 and indicator 12. The invention improves the speed of measurement of the transformation ratio -time scale. 1 il. & (L with so about JV 05 00

Description

ten

15

signals, i.e. increasing them by K times where K is the transformation ratio of the time scale. Accordingly, the transformation of the frequency of the studied - fc / K FC and calibration signals f ../ K F ,, takes place. Researched

the signal with the transformed frequency is separated by the second low-pass filter 6, and the calibration signal with the frequency F 7 /, is selected by the second high-pass filter 7 and is fed to the input of the second pulse generator 8.

Upper band edge frequency

gnch

passing F.-uu of the second lower filter

20

their frequencies are chosen to be equal to the lower frequency frequency F |. cz of the second high-pass filter, and also so that the condition

The invention relates to electrical measuring technology and can be used in determining the parameters of stroboscopic transducers of electrical signals.

The aim of the invention is to increase the speed of measuring the transformation ratio of the time scale.

The drawing shows a block diagram of a device for calibrating a stroboscopic converter.

The device contains the first low-pass filter 1, the output of which is connected to one of the inputs of the adder 2,. another input of which is connected to the output of the first high-pass filter 3, the input of which is connected to the output of the generator 4 of a sinusoidal continuous signal. The output of the stroboscopic converter 5 is connected to the inputs of the second low-pass filter 6 and the second high-pass filter 7, the output of which is connected to the second input 25 is the minimum value of the ratio of the first shaper 8 pulses, the output of the time scale transformation, and of which the output of the first shaper 9 pulses are connected to the inputs of the key 10, the output of which through the counter 11 is connected to the input of the indicator 12.

The device works as follows.

The signal under study is fed through the first filter 1 of the lower frequencies to the first input of the adder 2, to the second input of which a calibration signal generated by the generator 4 of the sinusoidal signal is fed through the first filter 3 of the upper frequencies. Frequency

You are elected by the highest

 with max I K

/ F

G6H

thirty

The ratio f / fj. defined

the ratio Fts / Fpgts is the maximum value of the transformation ratio.

With the help of the first pulse generator, a square wave signal with a repetition period T and the same frequency f, which is

35

calibration signal f is two or more times higher, the frequency component of the probe is 40

is supplied to the second input of the key 10, the first input of which is supplied by the rectangular pulses formed by the second driver 8 with the repetition period TC and respectively with the frequency Fj.

During the time T, K, a certain number of pulses pass through the key

T to-K

my signal

f, i.e., f 7 /

CWclKC to

to provide separation

year

SMIX

in terms of the frequency of the test and calibration signals at the output of the stroboscopic converter when the transformation ratio of the time scale varies from the maximum value to the minimum value. The first low-pass filter 1 and the first fi-ptr 3 high-frequency provide isolation of the sources of the test and calibration signals. From the output of the adder 2, the sum of the test and calibration signals is fed to the input of the stroboscopic converter 5, where the time parameters are transformed.

signals, i.e. increasing them by K times, where K is the transformation ratio of the time scale. Accordingly, the transformation of the frequency of the studied - fc / K FC and calibration signals f ../ K F ,, takes place. Investigated

the transformed frequency signal is extracted by the second low-pass filter 6, and the calibration signal with a frequency of F 7 /, the ect filter by the second high-pass filter 7, and is fed to the input of the second pulse generator 8.

Upper band edge frequency

gnch

passing F.-uu of the second lower filter

their frequencies are chosen equal to the lower boundary frequency F |. cz of the second high-pass filter, and also so that the condition

the minimum value of the transformation ratio of the time scale, and

the value of the temporary coefficient

gnch

 with max I K

/ F

G6H

the value of the coefficient of information of the time scale, and

The ratio f / fj. identifies

the minimum value of the transformation ratio of the time scale, and

ratio Fts / Fpgts - maximum conversion ratio.

Using the first pulse shaper 9, a square wave with a repetition period T and the same frequency f, which is generated from the calibration signal coming from the generator 4 of the sinusoidal signal,

is fed to the second input of the key 10, to the first input of which square-wave pulses are generated, formed by the second driver 8 with the repetition period TC and, respectively, with the frequency Fj.

During the time T, K a certain number of pulses passes through the key

N

T to-K

± 1

With N 1 ,, Ni K, where K is the transformation ratio of the temporal mastaba.

The number of pulses N is counted by the counter 11 and is indicated by the indicator 12.

Claims (1)

Formula Breach A device for calibrating a stroboscopic converter of electrical signals containing terminals for connecting a test object, a key whose output is connected to the input of a counter whose output is connected 31330568 with the input of the indicator, a low-pass filter and a second filter, so that, in order to boost the upper frequencies, the output of which is not speedy, two low-pass filters, an adder, are connected to it through the second pulse shaper, one of the key inputs, another sinusoidal signal generator, two of whose input is connected to the output of a pulse shaper, two filters of the first pulse shaper, a high-frequency input, and the output of the first of which is connected to the output of a low-pass filter pa sine signal and an input connected to a Q terminal connected to the first high-pass filter, yield Cheney test object, friend, which is connected to the other input terminal is connected to the second adder inputs.