SU785978A1 - Device for tolerance checking of pulse repetition frequency - Google Patents

Description

one

The invention relates to electrical measuring equipment, can be used for tolerance control of the pulse frequency, for example, in automatic control systems of the voltage generator.

There are known devices containing a pulse shaper, whose input is connected to a source of controlled pulses, and the first output is connected to the first inputs of the AND AND-NAND logic elements, an RS flip-flop, two inputs of which are connected respectively to the second output of the shaper 15 pulses and the output of the logical element AND-NOT, and the output of the pb-flip-flop is connected to the second input of the logical element I 1.

A disadvantage of the known devices 20 is the effect of temperature factors on their accuracy.

It is also known a device for the tolerance control of the pulse frequency, which contains a shaper of 25 pulses, an AND element, an AND-NOT element, a P.5-trigger, a counting trigger, a pulse-code converter, and a multiple-input AND-NOT 1.2 element. The disadvantages of the known device 30

are slow and reliable controls.

The aim of the invention is to increase the speed and reliability of the control.

Claims (2)

This is achieved in that a known device containing a pulse shaper, the input of which is connected to the source to be controlled. pulses, and its output is connected to the first input of the first element AND and the zero input of the H-trigger, the zero output of which is connected to the second input of the first element AND and the converter input of the pulse duration - a code whose outputs are connected to the corresponding inputs of the multi-input element AND NAND, the output of which is connected to the single input of the RS flip-flop, the second element I and the delay element are entered, the output of the pulse shaper is connected to the input of the converter, the pulse width is a code, and the single output of the RS flip-flop connected to the first input of the second element And directly and with the second input of the second element And through the delay element, and the output of the second element And is connected to the output terminal of the device. The drawing shows a block diagram of the device. The device contains a pulse shaper 1, an RS flip-flop 2, a pulse width converter - code 3, a multi-input element AND-HE 4, a delay time for jMeHT 5, and elements 6 and 7. The device works as follows. With the arrival of the first pulse from the source of controlled pulses (not shown in the drawing) to the input of shaper 1 on the leading edge of this pulse, the shaper produces a short pulse that the transducer sets the pulse duration — code 3 returns to its initial state and sets the ftS trigger to 2 zero state. The signal 1 from the zero output of the as-flip-flop 2 triggers the transducer pulse duration — code 3. If the frequency of the controlled pulses exceeds a predetermined rate, and the next pulse arrives at the input of the imaging unit 1 until the pulse ippulse is triggered — code 3; This impulse, coinciding with signal 1 from the zero output of the RS trigger 2 at the inputs of the element I b, is allocated at its output. If the frequency of the monitored pulses is less than a predetermined norm, then the transducer pulse duration - code 3 through the multi-input element AND-NOT 4 sets signal 1 at the single output of the RS flip-flop 2, which goes to the first input of the element 7 and directly and through element 5 to the second input of the element AND 7. The absence of a pulse at the input. Former 1, due to the frequency lagging from a predetermined norm, triggers element 5, and a frequency lag signal appears at the output of element And 7. The device for the tolerance control of the pulse frequency has a high speed, since the frequency control is carried out in the cath period of the controlled pulses, and provides increased reliability of the control, since it reacts both to the pulse frequency exceeding in relation to the preset rate and lagging pulse repetition rate from this norm. The invention The device for tolerance control pulse frequency, containing a pulse shaper, the input of which is connected to a source of controlled pulses, and its output is connected to the first input of the first element And the zero input RS-trigger, the zero output of which is connected to the second input of the first element And and the pulse width of the converter input is a code whose outputs are connected to the corresponding inputs of the multi-input NAND. element, the output of which is connected to the single input of the RS trigger, which is In order to improve the speed and reliability of the control, a second AND element and a delay element are inserted into it, the output of the pulse shaper is connected to the input of the converter, the pulse width is a code, and the single output of the trigger is directly and with the second input of the second element And through the delay element, and the output of the second element And is connected to the output terminal of the device. Sources of information taken into account in the examination of 1. For France of France No. 2180452, cl. Q 01 And 23/00, 1974. 2. USSR author's certificate number 577659, cl. H 03. K 5/18, 1978 (prototype).