SU1347070A1 - Vibrating wire transducer repiodometer - Google Patents

Abstract

The invention relates to electrical measuring equipment and can be used to measure the period of a noisy signal. The purpose of the invention, the increase in noise immunity, is achieved by eliminating false attempts at the input amplifier limiter. The device contains an element, a match, a pulse shaper 2, a pulse generator 3, triggers 4 and 5. The shaper contains three D-flip-flops, an inverter, two counters, and elements E and NL. The invention protects the device from spurious signals appearing at its input. 1 hp f-ly, 2 ill. 5x. Ooh

Description

FIG.

This invention relates to electrical measurement technology and can be used to measure the period of a noisy signal.

The aim of the invention is to increase the noise immunity by eliminating the false alarms of the input limiting amplifier.

FIG. 1 shows a block diagram of a period number for string sensors; FIG. 2 is a block diagram of a pulse former.

Periodometer for string sensors

contains a match element 1, which forms or appears more than one

times (due to amplifier chatter), then after time t, a pulse corresponding to a logical unit appears at the second output of driver 2, 2Q on the leading edge of which trigger 5 is set to O and its inverse output, and therefore, the output of the periodometer is set single level. In the case of chattering on the input bus, the periorizer 2 pulses, the pulse generator 3 and the triggers 4 and 5. Moreover, the pulse generator 3 output is connected to the first input of the pulse generator 2, the second input of which is connected to the output of the j matching element 1 the first input is connected to: the input bus and the first input of the trigger 4, the second input of which is connected to the first output of the driver 2 pulses, and the inverse output is connected to the first output bus of the periodometer by the second input of the coincidence element 1 and the first input of the trigger 5, the second input which is connected to the second output of the pulse generator 2, and the inverted output - to the second output line periodomera.

25

A docker 1 appears at the first output of the former 2 through time t, i-t. after the end of the bounce, i.e. when 1 at the output of the periodomer, time 30 was kept, t. In this case, at the first output of the imaging unit 2, O is set, and the trigger 4 is set. in 1, which is fed to the first output bus of the periodometer and to the input of the coincidence element 1, the output of which is set to 1, and the first output of the imaging unit 2 is set to O.

Shaper 2 pulses (Fig, 2), contains counter 6, .D-flip-flop 7, inverter 8, D-flip-flops 9 and 10, counter 11, inverter 12, element OR 13 and element -and 14. Moreover, the second input of shaper 2 pulses connected to the R-input of the counter 6 and the C-input D of the trigger 7 directly and through the inverter 8 to the C-inputs of the D-flip-flops

9 and 10, inverse D-flip-flop output

10connected to the R-inputs of the counter 11

and D-flip-flops 7 and 9, B-inputs of D-flip-flops 7 and 10 are connected to the logic unit bus, direct output of B-flip-flop 7 is connected to KD-input of B-flip-flop 9 directly and through inverter 12 to the first input of ILT-13 element whose second input is connected to the direct output of the B-flip-flop 9, and the output is connected to the first input of the AND 14 element, the second input of which is connected to the output of the counter 11 "R-input of the B-flip-flop 10, the outputs of the counter 6 and of the And 14 are respectively the first and second outputs of the driver 2 pulses.

the first input of which is connected to the C inputs of counters 6 and 11,

Periodometer works as follows.

Let at the initial moment of time at its first input and at both inputs a logical zero. With the appearance of a unit level on the input bus, the logical zero arrives at the input of the matching element 1,

this in case

one

at the entrance

periodometer during the time t coxpraise (due to amplifier bounce), then after time t, a pulse corresponding to a logical unit appears at the second output of shaper 2, Q on the leading edge of which trigger 5 is set to O and its inverse output, and therefore., and a single level is set at the periodomer output. In case of chatter on the input bus perio0

five

five

A docker 1 appears at the first output of the former 2 through time t, i-t. after the end of the bounce, i.e. when 1 at the periodomer's output, the time t,. In this case, at the first output of the imaging unit 2, O is set, and the trigger 4 is set. in 1, which is fed to the first output bus of the periodometer and to the input of the coincidence element 1, the output of which is set to 1, and the first output of the imaging unit 2 is set to O.

The installation O at the outputs of the peri- domer is analogous to the arrival of a zero level on its input bus.

If a short pulse (with a duration) arrives at the input of the periodometer, the outputs of the imaging unit 2 of Setup 1 do not occur and from the time t the periodometer returns to the initial waiting state, I

Shaper 2 pulses works as follows. At the initial moment of time, at its second input, 1 is installed, counters 6 and 11 are reset to O, at outputs B of flip-flops 7, 9 and 10, and at both outputs of the driver.

With the arrival of O, the second input of the driver 2 turns on the counter 6 and is set to 1 trigger 10, and to the R input of the counter 11 it enters

3 - 1347070

reset counter f t,

p on input 1 of the forcing device 1, then the counter 6 is set to O, into D-flip-flop 7 behind- 1, and to the input of the element it drops O, as a result of output 1 may occur if the D-flip-flop is 9 o 1, which happens when 2 O one during operation, i.e. for t.

F to

you log in

After time tj, after turning on the counter 11, 1 appears at its output, arriving at the input of the element AND 14 and at the R input of the trigger 10. At this, the triggers 7 and 9 and the counter 11, i.e. A short pulse is generated at the output of counter 11. In this case, if not set to 1 flip-flop 7 or set to 1 flip-flops 7 and 9, at the output of the element 14, i.e. A second pulse appears at the second output of shaper 2, the duration of which is equal to the delay time for resetting trigger 10 and counter 11. The real pulse elements are sufficiently long for operation, but it can be stretched using, for example, a single vibrator.

After time t, t after the input signal bounces off and after the 2 O generator is installed at the first input, a pulse of level 1 appears at its first output, on the leading front of which an input is set at the output of trigger 4

signal. At the inputs of element 1, match

The same signals are set up, and 1 is fed to the input of Shaper 2, resetting the counter 6 to O.

T and t values; are determined by the maximum time between adjacent operations (input amplifier) (not shown) with bounce, and the values of t and t are set by selecting the digit of counters 6 and 11, based on the frequency of the generator 3. t, and tj , should be chosen close, but the time t, -t, j must be longer than the trigger time

and 5.

t ,.

In real schemes it is possible

Claims (2)

Claim 1. Periodometer for string sensors, comprising a pulse generator. 0 5 5 o g five 0 five the output of which is connected to the first input of the pulse generator, the second input of which is connected to the output of the coincidence element, the first input of which is connected to the input bus of the periodometer and the first input of the first trigger, whose output is the first output of the periodometer and connected to the second input of the coincidence element and the first the second trigger input, the output of which is the second periodometer output, characterized in that, in order to increase the noise immunity, the first and second outputs of the pulse former are connected to the second input i.vtorogo give respectively a first trigger, 2. The periodometer according to claim 1, about the tl and - due to the fact that the pulse shaper contains two counters, three D-flip-flops, two inverters, elements AND and OR, and the second input of the pulse shaper is connected to the R-input of the first counter and with the C-input of the first D-flip-flop directly and through the first inverter - with the C-inputs of the second and third D-flip-flops, the inverse output of the last of which is connected to the R-inputs of the second counter and the first and second D-flip-flops, The D inputs of the first and third triggers are connected to the bus of a logical unit, the direct output of the first D-flip-flop is connected to the D-input of the second D-flip-flop directly and through the second inverter to the first input of the OR element, the second input of which is connected to the direct output of the second D-flip-flop, and the output to the first input of the And element, the second input of which is connected to the output of the second counter and the R input of the third D flip-flop, the outputs of the first counter and the element And are respectively the first and second outputs of the pulse generator, the first input of which is connected to the C inputs of the first and second counters. I2j 2 Editor O. Golovach Compiled by P. Pletnev Tehred I. Popovich Order 5120/46 Circulation 370Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, ul. Project, 4 Proofreader L. Pilipenko