SU627418A1 - Rectangular pulse relative duration digital meter - Google Patents

Description

The invention relates to an electronic technique, can be used when creating an electronic-counting meter for the duty cycle of signals of a pulsed state.

A digital pulse duty cycle digital pulse meter is known}, which contains drivers, selectors, pulse counters, a geierator of the reference frequency, and a trigger.

This device is unreliable due to the large number of functional waps.

Closest to the proposed digital meter for the duty cycle of rectangular pulses is 2J. | A co-frequency reference frequency generator, three keys, a frequency divider, two triggers, a block of the falling edge of pulses and a pulse counter.

This device has the same drawback as the previous one.

The purpose of the invention is to simplify and improve the reliability of a digital porosity meter of rectangular impulses.

The goal is achieved by the fact that in a digital meter the duty cycle of rectangular pulses, containing a reference frequency generator; counter

pulses, the input of which is connected to the first input of the key, whose output is connected to the input of the frequency divider, the block of the falling edge of the pulses, the output of the reference frequency generator, is connected to the first input of the key, the second input of which is connected to the enable input of the reference generator

frequencies, the input of which is connected to the output of the frequency divider.

FIG. Figure 1 shows a structural electrical circuit of a digital meter for the duty cycle of rectangular pulses;

in fig. 2 shows the timing diagram of his work.

Claims (2)

The digital pulse duty indicator of the TAPE pulses contains the reference frequency generator 1 (operating in the standby mode), ktoch 2, bpoc 3 6 trailing edge selection, frequency divider 4, the pulse counter 5 and the crown 6 (Start). The gauge works as follows. Measurement of the duty cycle begins with the passage of the next impulse of the input pulse sequence U g through the Start 6 circuit. This impulse arrives at the block, 3 separating the trailing edge of the pulses. Unit 3 generates pulses from the falling edge of the impulse, ow input pulse sequence, and the magnitude of the pulses at its output does not depend on the magnitude of the pulses of the input pulse sequence. The pulses from block 3 arrive at the permissive input of the generator .1.- At this, the generator begins to generate pulses of the reference frequency (c. Pulses from the generator arrive at key 2 and pulse counter 5. At the other input of key 2. pulses of the input pulse sequence arrive. Pulse (N) from key 2 is sent to frequency divider 4 with division factor tl. At the output of the divider, an impulse occurs after the frequency divider 4 arrives at its input n impulse C and the impulse arrives at the inhibitory input of the generator 1. At the same time Pulsing the reference frequency. If the measurement takes place in a time equal to three periods of the input pulse sequence (Fig. 2, UBX) and No 5ffgu N-aTfo measured duty cycle But ZT1o T IZLL (F G Y NQ - NUMBER of pulses coming on counter 5; 84 N is the number of pulses of frequency IQ applied to frequency divider 4 during the measurement time; T is the repetition period of impulses of the input pulse sequence G the pulse width of the input pulse sequence. The described digital meter for the duty cycle of square pulses is simpler and more reliable than the known ones. DETAILED DESCRIPTION OF THE INVENTION A digital meter for the duty cycle of rectangular pulses comprising a reference frequency generator, a pulse counter, the input of which is connected to the first input of a key, the output of which is connected to the input of a frequency divider, an impulse trailing edge extraction unit, in order to simplify and enhance it. reliability, the output of the reference frequency generator is connected to the first key input, the second input of which is connected through a series-connected switch and block of the trailing edge of the impulses I decide tsemu input reference frequency generator inhibit input coupled to an output of the frequency divider. Sources of information taken into account in the examination: 1. USSR author's certificate No. 408229, q 01 I 23/02, 24.O3.72. 2. Forward N92360615, Q 01 R 23 / O2, 17.O5.76, according to which the decision to issue an author's certificate was made. Phi, r1 shshshshposhshdshppshshshpp. ppp ppp ppp