SU1273829A1 - Device for checking boundary frequengy - Google Patents

Abstract

This invention relates to electrical measuring devices. Can be used to control electronic components. The purpose of the invention is to improve the control accuracy achieved by sampling the frequency of the output signals of the device. To achieve this goal, a decoder 4 and a differentiation unit 7 are additionally output to the device. The drawing also shows the generator 1 reference pulses, a counter 2 pulses, a controlled frequency divider 3, limiting amplifiers 5 and 6, an indicator. B. In the device, by sampling the frequency of the output signals, which is carried out depending on S on the type of signal at the output of the test object, the accuracy is increased (L control of the boundary frequency. 2 Il.

Description

The invention relates to electrical measuring devices and can be used to control electronic components.

The purpose of the invention is to increase the accuracy of control by sampling the frequency of the output signals of the device.

In FIG. 1 shows a functional diagram of the device; in FIG. 2 - timing diagrams of the output signals of 10 blocks of the device.

The device comprises a generator 1 of reference pulses, a counter 2 pulses, a controlled frequency divider 3, a decoder 4, the first and second amplifiers 15 limiters 5 and 6, block 7 differentiation, indicator 8.

The output of the reference pulse generator 1 is connected to the signal input of a controlled frequency divider 3, the output 20 of which is connected to the input of the first limiting amplifier 5, the output of which is the output of the device and connected to the input of the control object.

The information input of the device 25 is the input of the second amplifier-limiter 6. The input of the device is connected to the output of the control object. The output ^ of the second amplifier-limiter 6 is connected to the input of the differentiation unit 7, the output of which is connected to the signal input of the pulse counter 2, the outputs of the bits of which are connected to the corresponding inputs of the bits of the indicator 8 and the inputs of the decoder 4, the outputs of which are connected to the corresponding control inputs of the controlled 3 frequency divider. The start input of the device is the input of the initial setting of the counter 2 pulses.

The device operates as follows.

The generator 1 reference pulses generates pulses with a frequency

- the frequency of the pulses at the output of the generator 1 reference pulses;

- cutoff frequency of the control object.

where f _9t

Fro

The pulse from the start-up input of the device (Fig. 2, a) counter 2 pulses is set to its initial state, 5® while the status code of the counter 2 pulses from the outputs of its bits goes to the inputs of the bits of the indicator and to the inputs of the decoder 4. Decoder 4 converts the input code with the outputs of the bits of the counter 2 pulses in the control code of a controlled frequency divider 3 of the frequency R * = n, providing the minimum specified frequency F = F _9T / K ₁ pulses at the output of the latter. The minimum frequency pulse from the output of the controlled frequency divider 3 (Fig. 2, l) through the amplifier-limiter 5 is fed to the input of the control object, the output of which is a reaction in the form of a pulse (Fig. 2, f) having a delay along the leading edge Г _п and on the trailing edge 7, enters through the amplifier-limiter 6 and the unit.

differentiation (Fig. 2, g) to the signal input of the counter 2 pulses. The pulse counter 2 under the influence of pulses from the output of the differentiation unit 7 changes its state by one, in indicator 8 the status code of the counter 2 pulses is converted to the frequency code at the output of the controlled frequency divider 3 and the frequency value F ₍ displayed by indicator 8. Decoder 4 converts the counter status code 2 pulses in a controllable divisor control code frequency 3 K _g = n-1, which leads to a change in frequency at the output of the divider 3 managed by one discrete frequency output frequency. The next pulse from the output unit 7 d fferentsirovaniya pulse counter 2 changes its state indicator 8 indicates the value of F _2, and the output of the decoder 4 establishes code K ₃ = n-2, which increases the frequency vkodnoy yet another discrete, i.e., the output frequency is equal to F = ₃ F +1, etc. As can be seen from figure 2, d, f, the duty cycle of the pulses at the output of the controlled frequency divider 3 is kept constant, and at the output of the control object it increases to a value of 1 in the limit. those. with a decrease in the pause between reaction pulses to? = 0) at the output of the control object, a constantly high potential is established, i.e. the control object does not have time to respond to input pulses. Then, at the output of the differentiation unit 7, the appearance of pulses is excluded, the pulse counter 2 is fixed in a state in which the frequency F ^ at the output of the controlled frequency divider 3 is one discrete frequency higher than the cut-off frequency F _rp of the control object, and indicator 8 fixes the value F _fp = F. -1 . The repetition of these operations is possible only when filing them; pulses at the start input of the device.

Thus, due to the discretization of the frequency of the output signals, which is carried out depending on the type of signal at the output of the monitoring object, the accuracy of control of the cutoff frequency increases.

Claims (1)

The invention relates to electrical measuring devices and can be used to control electronic components. The purpose of the invention is to increase the control accuracy by sampling the frequency of the output signals of the device. In FIG. 1 shows a functional diagram of the device; in fig. 2 - timing charts of the output signals of the blocks of the device. The device contains a generator of 1 reference pulses, a counter of 2 pulses, a controlled frequency divider 3, a decoder 4, the first and second limiting amplifiers 5 and 6, a differentiation unit 7, an indicator 8. The output of the generator 1 reference pulses is connected to the signal input of the controlled divider 3 frequencies, the output of which is connected to the input of the first amplifier-limiter 5, the output of which is the output of the device and is connected to the input of the test object. The information input of the device is the input of the second amplifier-limiter 6. The input of the device is connected to the output of the control object. The output of JBToporo amplifier limiter 6 is connected to the input of differentiation unit 7, the output of which is connected to the signal input of the counter 2 pulses, the outputs of the bits of which are connected to the corresponding inputs of the bits of the indicator 8 and the inputs of the decoder 4, the outputs of which are connected to the corresponding control inputs of the controlled divider 3 frequencies. The device start input is the setup input of the 2 pulse counter. The device works as follows. The generator 1 of the reference pulses produces pulses with a frequency of PT g. where Fj is the frequency of the pulses at the output of the generator 1 reference pulses; - the limiting frequency of the control object. A pulse from the device start input (Fig. 2, a) the pulse counter 2 is set to its initial state, while the state code of the pulse counter 2 from its discharge outputs is fed to the bits of the indicator 8 and to the inputs of the decoder 4. The decoder 4 converts the input the code from the outputs of the bits of the counter 2 pulses to the control code of the controlled divider 3 of the frequency R p providing the minimum specified frequency of the pulses at the output of the latter. The impulse of the minimum frequency from the output of the controlled frequency divider 3 (Fig. 2, L) through the limiting amplifier 5 is fed to the input of the control object, from the output of which the response is in the form of a pulse (Fig. 2, e) having a delay on the leading edge of and on the falling edge T, is fed through the limiting amplifier 6 and differentiation unit 8 (Fig. 2, g) to the signal input of the counter 2 pulses. The pulse counter 2 under the action of the pulses from the output of the differentiation unit 7 changes its state by one, in the indicator 8 the counter state code 2 of the pulses is converted into the frequency code at the output of the controlled frequency divider 3 and the frequency value F is displayed by the indicator 8. The decoder 4 converts the state code of the counter 2 pulses into the control code of the controlled divider 3 frequencies K p-1, which leads to a change in the frequency at the output of the controlled divider 3 frequencies by one discrete frequency of the output frequency. The next pulse from the output of differentiation unit 7, the pulse counter 2 changes its state, the indicator 8 indicates the value FJ, and the output of the decoder 4 sets the code Kj (1-2, which provides an increase in frequency by another increment, i.e. is equal to FF +1, etc. As can be seen from Fig. 2, d, e the duty cycle of the pulses at the output of the controlled divider 3 frequencies remains constant, and at the output of the test object, it increases to a value of 1 in the limit. impulses of the reaction unit (i.e. with decreasing pa between the reaction pulses up to t, a permanently high potential is set at the output of the control object, i.e. the control object does not have time to react to the input pulses. Then, at the output of the differentiation unit 7, the appearance of the pulses is eliminated, the counter 2 pulses is fixed at where the frequency F is at the output of the controlled splitter 3 of frequency 31 by one frequency increment greater than the cut-off frequency F | .p of the test object, and indicator 8 fixes the value F. F. -1. The repetition of these operations is possible only when the supply of pulses to the device start input. Thus, by sampling the frequencies of the output signals, which is carried out depending on the type of signal at the output of the control object, the accuracy of the control of the cut-off frequency is increased. Apparatus of the device for controlling the cut-off frequency, comprising a generator of reference pulses, the output of which is connected to the signal input of the control frequency divider, the output of which is connected to the input of the first amplifier -og 294 reducer, the output of which is the output of the device, the second amplifier, the input of which is information input device, pulse counter, the OUTPUT bits of which are connected to the corresponding inputs of the bits of the indicator, characterized in that, in order to increase accuracy, he entered the decoder and differentiation unit, the input of which is connected to the output of the second amplifier limiter, and the output - to the signal input of the pulse counter, the outputs of the bits of which are connected to the corresponding inputs of the decoder, the outputs of which are connected to the corresponding inputs of the control of the controlled frequency divider, while the device start input is the pulse counter setup input. i (rig 2