SU824436A1 - Percentage digital measuring converter - Google Patents

Description

The invention relates to automation and measurement technology and can be used in information measurement systems and computer devices. Of the known percentage time-pulse converters, the closest in technical essence to the present invention is a converter comprising a control unit, a generator of counting pulses, a nominal value recording unit, keys, a pulse number counter, corresponding to the nominal value of the measured parameter, a counter of the number corresponding to the measured parameter, common binary pulse counter, two blocks of coincidence circuits, two gathering circuits, additional coincidence circuit, two frequency dividers, depshfrato p inconsistencies, which is one of two three., two coincidence schemes and collection schemes, and an auxiliary key. Moreover, the output of the first frequency divider is connected to the first input of the power failure array, the output of the second matching circuit block is connected in parallel to the signal input of the additional key in parallel, and therefore the connected additional match circuit to the second frequency divider, the output of which is connected to the second input of the mismatch mismatch through additional key with digital pulse counter input, G11 The disadvantages of this converter are great complexity and low rodeystvie because it works in two cycles, and the absence indicating a sign of the measured deviation from the nominal parameter values. The purpose of the invention is to simplify the converter, increase speed and increase functionality. The goal is achieved by the fact that as a percentage of digital measurement. A transducer, a counting pulse generator, the output of the cathefogo is connected to the first inputs and the second coincidence elements, the output of the first of which is connected to the first input of the element | 1ЛИ, utflavalii through the nominal value input signal of the third element. trigger, result counter, the output of which is connected to the first input of the digital indicator, delay lines are inserted, two inverters and a sign trigger, with the device input bus connected directly to the switch the second control input and the input inputs of the result and nominal value counters and through the delay line with the second input of the control trigger, with the input of the first inverter and the second input of the third match element, the third input of which is connected to the output of the generator of counting pulses, the output of the control the trigger is connected to the second inputs of the first and second elements of the match, the output of the latter through the element OR is connected to the counting input of the result counter and directly to the first input of the trigger ka, the direct and inverse outputs of which are connected to the sign inputs of the digital indicator indicator, the output of the nominal value counter is connected via the second inverter to the third inputs of the first and second match elements, the fourth input of the second element coincides with the output of the first inverter, and the output of the third match element connected to the second sign trigger input. FIG. 1 shows a block diagram of a converter; in fig. 2 shows time diagrams, as shown in FIG. 2. The percentage converter contains a delay line 1, a generator of 2 counting pulses, a control trigger 3, inverters 4 and 5, elements 6, 7 and 8 coincidence, counter 9 of nominal value, element OR 10, a result counter 11, a trigger 12 characters and a digital indicator 13. The operation of the converter is based on counting the number of pulses exceeding the norm or missing to their nominal value. At the initial moment, the counter 9 pulses, corresponding to the nominal value of the measured parameter, and the counter 11 of the result are set to zero, the trigger 3 is in the zero state, the generator 2 generates counting pulses. When a pulse converter arrives at the input, the duration of a sec. Parameter is proportional to the parameter being measured, greater than the nominal value, trigger 3 is transferred to one state, and i opens a coincidence element b, counter 9 from the generator 2 begins to receive counting pulses. The capacitance of the counter 9 is equal to 10 (where n 1, 2, 3, ...) and may vary depending on my accuracy of measuring the deviation of the parameter from the nominal value. When the number of counting pulses in the counter 9 is equal to 10, the pulse overflows, which through the inverter 5 arrives at the coincidence element 6 and thus prohibits the further arrival of the counting pulses on the counter 9. Thus, the overflow signal will remain at the counter output. At the same time, the overflow pulse enters the input of the coincidence element 7, the other two inputs of which are fed counting pulses from the generator 2 and a pulse corresponding to the parameter being measured. At the output of element 7, the coincidence of the pulses exceeds the norm of pulses in the TC of the counting pulses, the frequency of which is equal to fg. After the termination of the pulse duration tx, the coincidence element 7 is closed, and the counting of the pulses exceeding the rate ends here. The counter 11 in this case will record the number of pulses emit) -fo. tjj is the pulse duration, corresponding to the nominal value of the parameter being measured. The frequency f is chosen in such a way that the period of the following counting pulses TQ and the pulse duration corresponding to the nominal value of the measured parameter tp are in the ratio 12. 10, where. N 1, 2, 3, ... The first pulse passing the coincidence element 7 switches the sign trigger 12 to a state corresponding to exceeding the norm (for example, +). about the number of pulses Ngj ,, j (the sign of the result is Oa digital inducator 13. The next information pulse arrives at the incoming generator with its leading edge of the mouth: it pours counters 9 and 11 into zero-zero, as well as Trigger 3. J & {1 no delay delays the information pulse for a time sufficient for the end of the transient processes in counters 9 and 11 and in the trigger 3. Thus / the switch is returned to its initial state. The NRNI follows the informational pulse with a duration tx / ji less than the duration nominal However, after the termination of the information impulse, the counting pulses have to arrive at the counting point 9, and since the end of the information impulse, the counting pulses through the element 8 of the coincidence of the unsuccessful to the pulse of the pulses start counter 11 results.

The possibility of this is due to the appearance of a single potential at the output of the inverter, 4 while maintaining the single potentials at the other inputs of the coincidence element 8.

Pulse counting by the result counter 11 is stopped after an overflow appears on the output of the counter 9. This signal, inverted by inverter 5, prohibits the passage of counting pulses through coincidence element 8. Thus, in the result counter 11, the number of pulses is equal to.

. NO-NX 0 The first pulse from the output element

8 c. Switches the trigger 12 characters to the state corresponding to the negative value of the result. The information on the number of pulses and the sign of the result is recorded by the digital indicator 13..

The proposed converter is greatly simplified by reducing the number of functional elements used and excluding the most complex and expensive components from the circuit. In addition, the measurement time of the parameters is halved, so as information on the deviation of the measured parameter from the nominal value is entered into the result counter and the duration of the measured pulse is carried out in one cycle of the device.

Claims (1)

1.. The author's certificate of the USSR No. 429526, cl. H 03 K 13/20, 1971.