SU930223A1 - Time interval meter - Google Patents

Description

(5) TEMPORARY INTERVAL METER

Claims (2)

The invention relates to computing and can be used in automated control systems for various purposes and other areas related to discrete time measurement. A timer is known that contains an N-time sequential counter, a pulse generator, output gates, whose control input is a timer time read input, and output information busses. The disadvantage of a known timer is a low time accuracy due to the fact that the timer time read signals are asynchronous with the generator pulses that fill the binary counter, and can be read at the time they match. false value of time caused by transient processes from lower to higher bits of the timer counter when it is filled. Closest to the proposed technical entity is a timer containing an N-bit binary counter, in which the inputs and outputs of each bit are connected. respectively, through input vanes with input information buses and through output valves and output information buses, as well as a pulse generator, the output of which is connected to the first count input of the counter via a divider and key and is Timer readout bus. The control input of the input valves is a timer 2 time recording bus. This timer, in comparison with the known one, has a higher accuracy of timing, since the ability to read a false time value in it is eliminated due to the fact that the key is turned on between the divider and the counting input of the counter controlled by a time read signal. Therefore, the 8 moment of time when the pulse coincides with the output of the divider and the read pulse, the key is closed, and the fill pulse does not enter the counter during reading, thereby eliminating the occurrence of transients in the counter due to transfers of logical 1 values from the low-order triggers in senior. A disadvantage of the known timer is the relatively low accuracy of timing, due to the fact that when the read signal and the filling pulse coincide, the scientific research institute does not pass into the counter. As a result, the error is introduced when the current time is counted for the duration of the period of the following pulse filling. At repeated accesses to the timer, an accumulation of errors occurs, which can worsen in the end the performance of the automated control system using such a timer. This is especially undesirable when measuring long interpolations, for example, when counting astronomical time or when solving problems of controlling technological processes that are tightly coupled in time. The purpose of the invention .- improving the accuracy of timing. The goal is achieved by the fact that the 8 meter, containing a binary counter, the inputs and outputs of each bit of which are connected respectively through the input valves to the input information buses and through the output valves to the output information buses, as well as a pulse generator, the output of which is through a divider connected to the first input of the key, the output of which is connected to the first counting input of the counter, the control input of the output valves is connected via an inverter to the second input of the key and is the time reading bus, and the equal input of the input valves is a time recording bus, serially connected coincidence element and delayed pulse shaper are entered, and the same AND element and one-shot whose input is connected to the key output and the output to the first input of the element And whose second input is connected to the output the driver of the delayed pulse, and the output to the second counting input of the counter, the time reading bus is connected to the first input of the match element, the second input of which is connected to the output of the divider. In FIG. 1 is a block diagram of a time interval meter; FIG. 2 shows plots of individual node voltages for three possible cases of coincidence of the read control signal with the generator signal. The meter contains an N-bit counter 1, input valves 2, output valves 3, a pulse generator, a divider 5 key 6, an inverter 7, a coincidence element 8, a delayed pulse shaper 9 (FZI), an AND 10 element and a single vibrator 11 Inputs each the counter 1 through the inlet valves 2 are connected to the input information buses, and the outputs through the output valves 3 with the output information buses. Generator k pulses through deli-. 5 and key 6 is connected to the first counting input of counter 1. The control input of output gates 3, which is the time reading bus, is connected via inverter 7 to the second input of key 6. The output of divider 5 is connected via series-connected coincidence element 8 and FZI 9 and Element 10 is connected to the second counting input of counter 1. The second input of coincidence element 8 is connected to the time reading bus, and the one-shot 11 is connected between the output of switch 6 and the first input of input 10. The control input of the input gates 2 is a time recording bus. When the meter is operating, for example, in the astronomical time reference mode, the initial value of the meter is related to real time. For this, a binary code of the current time is fed to the input information buses, which, through the input gates 2, according to the time recording signal, is rewritten into counter 1. The pulse generator 4 generates a sequence of pulses with a stable frequency. Divider 5 reduces the pulse frequency by a necessary number of times (Fig. 2a), depending on the desired scale of the measured time. In the absence of a readout signal S of time (Fig. 26), the resolving potential from the output of the inverter 7 of Fig. 2c), the key 6 through the second input is open, and the next impulse from the divide 5 goes through the key 6 to the first counting input of the counter (Fig. Thus the element 8 coincides at the input input with a prohibiting potential on the readout bus, so the impulses from the divider pass to the FDI 9-the inhibitory potential from the output of the FZI 9 Fig 2g1 keeps the element 10 in the closed state. the counter is triggered and forms right angle pulse (Fig. 2 d), closing element I 10 at the first input. When the meter reads a time signal, the control inputs of the output valves 3 receive the binary code of the current time of the counter at a given edge of the read pulse to the output data lines. 3 connection with the fact that the readout signals are not connected synchronously with the generator pulses, their coincidence in time is possible, and three situations of coincidence may occur, full, partial coincidence with anticipation m of the signal is 1 Jan and partial overlap with the advance of the filling signal. At full coincidence, the filling pulse from the output of the divider 5 does not pass through the key 6, since the latter is closed at the second input by the recording potential of the output of the inverter 7, which forms this potential under the influence of the read signal. At the same time, the match element 8 is open on both inputs; a signal from the output of which (Fig. 2e) causes the FDI 9 to be triggered, which generates a pulse delayed with respect to the switching on of the FZI 9 for the duration of the pulse from the output of the coincidence element 8. After the end of the read signal, the pulse formed by the FZI 9 through the element I10, opened at the first input by the resolving potential of the one-shot 11, enters the second counting counter input (Fig. 2 h) and adds to its content a unit to eliminate the error resulting from the coincidence. When the read signal is partially coincided with the leading edge of the filling pulse from the output of divider 5, the FZI 9 triggers. Key 6 opens the falling edge of the read signal while the filling pulse is still present at the first input of the key, resulting in its output potential difference is formed, which is perceived by counter 1 as an impulse; the filling and starts simultaneously the one-shot 11. When the one-shot is triggered, its inhibitory potential for the second input element E10. Therefore, the pulse generated by the FDI 9 does not pass to the second counting input of the counter, thereby excluding the introduction of an error due to the double triggering of the counter from one filling pulse. The pulse duration of the one-shot 11 must be greater than the maximum delay time of the FZI 9. When partially coinciding with the filling advance on the leading edge of the filling pulse, the one-stroke 11 and the counter 1 increase (its contents per unit. However, the FZI 9 switches on and that the delayed impulse generated by it does not arrive at the second counting input of the counter t, the pulse duration of the single-sampler 11 must be at least 2 G. Thus, the use of new elements and connections improves the proposed meter in comparison with the known, as it allows to increase the accuracy of time counting due to the fact that the meter filling pulses, which coincided with the time meter signals of the time meter and did not enter the meter due to this irrevocably, and added to the contents of the counter after the end of the read signal. Using the meter eliminates the possibility of reducing the quality of the automated control system due to insufficient accuracy of real-time values and does not require additional software costs to eliminate this drawback. The invention The time interval meter containing a binary counter, the inputs and outputs of each bit of which are connected, respectively, through the input valves Q, the input information buses and Through the output valves with output information buses, as well as a pulse generator, the output of which is through a divider connected to the first key input which exit connected to the first counting input of the counter, the control input of the output valves is connected via an inverter to the second input of the key and is a time reading bus, and the control input of the input valves is a time recording bus that In order to improve the accuracy of timing, it introduced in series the coincidence element and the delayed pulse shaper, as well as the AND element and the one-shot, whose input is connected to the output of the key, and the output to the first input of the AND element, the second input of which is li ne to the output of the delayed inpulsa, and an output - to a second count input of the counter, the read time bus is connected to the first input of the coincidence element the second input of which is connected to the output of the divider. Sources of information taken into account during the examination 1. Yu. P. Zhuravlev. and Zabubenov V.N. Multitimers. L., Energie, 1979, p. 23.in 2. Manual. Timer. А129-2.2.817.002 РЭ. n n n ri FIG. 2