SU1308975A1 - Meter of transient process duration - Google Patents

Abstract

The invention relates to a measurement technique and serves to increase the accuracy of measuring the duration of the transient process. The device contains a pulse generator 1, a splitter 2, a comparison unit 3, a reference level setting unit 4 and a pulse shaper 5. A viitani block 6, frequency filters 7 and 8, multipliers 9-12, a conversion block 15 are introduced into the device and new functional connections are formed. The phase comparison unit 13 creates a coarse scale for measuring the duration of the transient process, ensuring the unambiguity of reference, but does not provide the necessary accuracy. The phase comparison unit 14 creates an accurate scale for measuring the duration of transients. 2 Il. SO O 00 with SP b

Description

eleven

This invention relates to a measurement technique.

The purpose of the invention is to improve the accuracy of measuring the duration of the transition process.

Fig, 1 shows a functional diagram of the transient time meter; Fig. 2 shows timing diagrams explaining the operation of the device.

The transient process duration meter contains (Fig. 1} 1 pulse generator, splitter 2, comparison block 3, block, 4 settings of the reference level, pulse shaper 5, subtraction block 6, first frequency filter 7, second frequency filter 8, first multiplier 9, the second multiplier 10, the third multiplier 11, the fourth multiplier 12, the first phase matching unit 13, the second phase matching unit 14, the conversion unit 15, the object 16, and the output of the pulse generator 1 is connected via the splitter 2 to the input of the object under studyThe first input of the comparison unit 3, the second input of which is connected to the output of the reference level setting unit 4, the first input of the pulse former 5 is connected to the output of the comparison unit 3, and the second input is connected to the second output of the splitter 2, the first input of the subtraction unit 6 is connected with the output of the pulse shaper 5, and the second input is connected to the third output of the splitter 2 pulses, the output of the subtraction unit 6 is connected to the input of the first frequency filter 7, you

and 11 frequencies, after which the oscillation frequency is increased by a factor of N, the signals N fср are fed to the inputs of the multipliers 10 and 12 frequencies with multipliers i13 of the phase comparison.

N, and on the first block

Signals

N, „

the stroke of which is connected to the input of the first 40 corresponding inputs of the multipliers 9 of the multiplier 9, the output of which is connected to the input of the second multiplier 10 and to the first input of the first phase matching unit 13, the output of the second multiplier 10 is connected to the first input of the second 45 phase matching unit 14 the output of which is connected to the first input of the conversion unit 15, the second input of the subtraction unit 6 is connected to the input of the second frequency filter 8, the output of which is connected to the input of the third multiplier 11, the output of which is connected to the second input of the first block 13 and a phase and to the input of a fourth multiplier 12, the output kotorogb soedi- yen to the input of the second phase comparing unit 14, the phase comparing output of the first unit 13 is connected to the second input converting unit 15.

 2 Wed

; arrive at the second block 14 of the compared phases. The signals from the outputs of the phase comparison blocks (the output signal of the first phase comparison block 13 is proportional to the multiplied phase shift N and the output signal from the second phase comparison block 14 is proportional to the multiplied phase shift NN, u (f) to the conversion unit 15, where the signal is converted to a form convenient for registration.

The obtained phase shifts P l V N N2 DCH allow in block 15 the statedevice works as follows.

The pulse generator 1 generates a periodic sequence of video pulses (FIG. 2A), which through the splitter 2 are fed to the object under study 16 and to the block 5 of the pulse former. Unit 4 of setting the level of samples at a given level (Fig. 2B) records the end of the duration of the transient process. The comparison unit 3, at the moment of the end of the transient process duration, absorbed a short pulse (Fig. 2B), which is fed to the second input of the driver 5 pulses. The latter forms pulses (FIG. 2G), the duration of which corresponds to the duration of the transition process of the object under study 16. The subtraction unit 6 subtracts the pulses generated by the pulse generator unit 5 (Fig. 2G) from the original pulse sequence (FIG. 2A).

At the output of subtraction unit 6, a periodic pulse sequence (Fig. 2D) is formed, which is shifted relative to the initial pulse sequence (Fig. 2A) by an amount equal to the duration of the transient process C, the object under study 16. At the outputs of frequency filters 7 and 10 and tuned to the frequency following the pulses f, generated by the generator 1, sinusoidal signals are formed that are shifted in phase by the value of LT (FIG. 2J, 3). Sinusoidal signals arrive at

and 11 frequencies, after which the oscillation frequency is increased by a factor of N, N fcp signals are received at the inputs of the multipliers 10 and 12 frequencies with coefficients of the corresponding multipliers 9

phase multiplication i13.

N, and on the first block

Signals

N, „

corresponding inputs of multipliers 9

 2 Wed

; arrive at the second block 14 of the compared phases. The signals from the outputs of the Phase matching blocks (the output from the first phase matching block 13 is proportional to the multiplied phase shift N, the output signal from the second phase matching block 14 is proportional to the multiplied phase shift NN, u (f) to the conversion unit 15, where the signal is converted to convenient to register.

The resulting phase shifts P L V N N2 DCH allow in block 15 to create a scale system for unambiguously determining the duration of the transient process dT in a sufficiently large range of its change.

The first phase comparison unit 13 creates a rough scale5 for measuring the duration of the transient process, ensuring the unambiguity of the reference, but does not provide the necessary accuracy. The second phase comparison unit 14 creates an accurate scale for measuring the duration of transients.

Claims (1)

Invention Formula A transient duration meter, containing a pulse generator, the output of which is connected through the splitter to the input of the object under study, the output of which the sub-switch 20 is connected to the input of the second frequency The first input of the comparison unit, the second input of which is connected to the output of the reference level setting unit, the first input of the pulse former is connected to the output of the comparison unit, 25 and the second input is connected to the second output of the splitter, in order to improve the Measurement accuracy compiled by E.Chevyrin Editor M.Blanar Tehred A.Kravchuk Proofreader S.Cherni Order 1796/39 Circulation 371Subscription VNIIPI USSR State Committee for Inventions and Discoveries 4/5, Moscow, Zh-35, Raushsk nab. 113035 Production and printing company, Uzhgorod, st. Project, 4 The first and second frequency filters, the first, second, third and fourth multipliers, the first and second phase comparison units, the conversion unit and the subtractor, the first input of which is connected to the output of the pulse former, and the second input connected to the third output of the splitter, are output; subtraction connected O with the input of the first frequency filter, the output of which is connected to the input of the first multiplier, the output of which is connected to the input of the second multiplier and to the first input of the first phase comparison unit, the output of the second multiplier is connected to the first input of the second phase comparison unit, the output of which is connected to the first input conversion unit, the second input of the subtraction unit filter, the output of which is connected to the input of the third multiplier, the output of which is connected to the second input of the first phase comparison unit and to the input of the fourth multiplier, the output of which is connected to the second input of the second phase comparison unit, the output of the first phase comparison unit is connected to the second input of the conversion unit.