SU660269A1 - Electronic digital pulse counter - Google Patents

Description

(54) ELECTRONIC DIGITAL IMPULSE COUNTER

one

This invention relates to a control and measuring system and is intended for use with pulse ultrasonic quality control devices.

It is known that when controlling the quality of working products, the number of incoming pulses is a random value, therefore, for non-destructive ultrasonic testing devices, electronic digital pulse counters are used consisting of series-connected counting decades connected by a reset element I and 2.

In limestone counters, the relative portage of the TOCTb depends on the number of pulses, since if the number of pulses exceeds the expected one set using the manual switch, then the result of the preset capacitance is distorted.

Also known is a counter equipped with memory elements connected to electronic switches and a feedback circuit spanning counting decades, however, pulse number dividers are connected in parallel with electronic switches, therefore during the switching time limits a certain number of pulses may arrive at the counter. creates an additional error | 3 | .

The aim of the invention is to increase the accuracy of the meter.

For this purpose, a circuit is inserted in the counter, designed to break the feedback, connected to the reset circuit, and the elements of the parameter set, including the divider, between the decoder) .. and control switches of the switches, which are connected to the outputs of the dividers, and other outputs are connected to the inputs of the same dividers.

FIG. 1 shows the structural electrical circuit of the meter; in fig. 2 - the location of the indicator lamps PA panel;

5 in FIG. 3 is an electrical circuit of the feedback circuit.

Claims (3)

Electronic digital pulse counter contains counting decade I, another 0 counting decade 2, dividers 3, decade 4 overflow counters, decoder 5, memory elements 6, electronic switches 7, reset circuit 8, CEc 9 feedback, circuit 10, designed To break, the indicator 11, the waiting multivibrator 2. and the electronic key 13. The counting decades and decades of the overflow counter have a digital indication and outputs for connection to external computing devices. Each counting decade contains, for example, a binary trigger meter, a decoder, and a digital lamp indicator. An electronic digital counter contains the same number of dividers, memory elements, and electronic switches (e.g., eight). The counter works as follows. In the initial position after pressing the "Reset the memory elements 6 are in such a state that the electronic switches 7 controlled by them are in the TJpTi position by the echo input pulses arrive at the second counting decade 2, the dividers min 3, and the indicator lamps on the panel show the figure "oh. After the 99th pulse, the lamps indicate 99. The hundredth pulse causes the first overflow of counting decades and goes to the overflow counter. In this case, the indicator lamps illuminate the entry shown in FIG. 2. The same hundredth pulse triggers multivibrator 12, the signal of which through a closed electronic key will go to the first counting decade 1, and on -the indicator lamp reads the digit “I, which corresponds to the reading of the result of one hundred pulses. At the same time, from the decoder of the overflow counter, the first memory element receives a control signal to the first switch, which is set to the position "b." Subsequent pulses at the counter input pass through the first pulse number divider, with a division factor of ten. Thus, only every tenth pulse will arrive at the second counting decade 2, and the second overflow of counting decades will be only after 900 pulses have been received. The process described below is then repeated, the difference being that the second memory element will work through the overflow counter decaller and the second switch will be set to position b, the overflow counter lamp will show the number 2, and the total reading of all the lamps on the panel will be 1000 pulses, etc. Thus, the two lamps of the counting decades show the first two bits and the gray bit are indicated on the panel as a factor of 10, and the exponent is displayed by the overflow counter lamp. The limit reading of the counter is: lOiO, i.e., ten billion pulses. So that when the Reset Pulse button is pressed to enter the first counting decade, the feedback circuit is interrupted by an electric key. The input indicator allows you to visually monitor the appearance of input pulses without waiting for the counting end, and to evaluate the rate of their appearance by the brightness of the indicator lamp. For remote control, a pulse from an external source is sent to the "Reset wire", which has an effect equivalent to pressing the reset button. At the same time, the duration of the pulses of the multivibrator exceeds the duration of the signals in the feedback circuit. This counter allows you to automatically measure the number of pulses in a large dynamic range, which is important when studying random processes. The invention The electronic digital pulse counter containing counting decades with digital indication, one part of which constitutes a counter of significant digits, and the other counter of overflows, one counting decade of the counter of significant digits covered by feedback, as well as dividers of the number of pulses, the decoder of overflow counter, electronic switches and a reset circuit, characterized in that, in order to improve accuracy, a feedback break circuit connected to the reset circuit and memory elements connected between them are inserted into it ifratorom and the control inputs of switches, Koropisix outputs are connected to one divider outputs and other outputs connected to inputs of the same divisors. Sources of information taken into account in the examination 1.K Tykino. Recalculation decades, M., “Energie, 1970, p. 41 2. Frequency meter 43-22 (description, operating instructions), Kiev, 1971, p. ten. 3. Digital Measuring Instruments, Handbook, L., “Energie, 1971. p. 24- 126, fig. 4-17. AND ABOUT /