SU824120A1 - Method of measuring single time intervals - Google Patents

Description

The invention relates to a measurement technique, in particular to the measurement of time intervals.

There is a known method for measuring the duration of one-time time intervals using several equally-spaced pulse sequences, including filling the measured interval with these sequences, calculating them and averaging the results of the calculation 1.

The disadvantage of this method is the complexity of the hardware implementation, a relatively large measurement time.

The purpose of the invention is to simplify the hardware implementation and reduce the measurement time.

The goal is achieved by determining and applying to the input of the counter a pulse sequence that starts first with respect to the beginning of the measured interval, for each pulse of this sequence the counter code is increased by a number equal to the number of pulse sequences, determined and recorded in the counter, the number of pulses from the remaining pulse sequences, which are forgiving from the end of the last pulse of the first pulse sequence to the end of the measured inter Ala.

FIG. 1 shows a block diagram of a device implementing the proposed method;

in fig. 2 - measured time interval

and counting pulses at the device input.

The device that implements the method consists

from two-input circuits AND 1 - 4, the first inputs

which are connected and connected to the control input 5 of the device, and the second inputs are connected to the corresponding inputs 6-9 of the device. The outputs of the two-input circuits And 1 - 4 are connected to the counting inputs of additional triggers 10-13

respectively, the outputs of which are connected to the priority key 14 and to the comparison logic 15. The output of the priority key 14 is connected to the input of the main counter 16 and to the input of the comparison logic 15.

Claims (1)

The output of the comparison logic 15 is connected to the counting input of the lower trigger 17 of the refinement counter 18. The output of the trigger 17 is connected to the counting input of the senior trigger 19 of the refinement counter 18. The circuit operates as follows. To reset the device to its original state, the Reset 20 serves, when a zero logic signal is applied to the additional triggers 10–13 are set to “1, and the main 16 and specifying 18 counters are reset. When a permitting (single) signal is applied to the control input 5, the Time Interval measurement process begins. Logic circuits AND 1-4 open and pass the equal-shifting pulses to the inputs 6–9 to the counting inputs of additional triggers 10–13. -13, triggered first, is fed to the input of the priority key 14, which connects the output of this trigger to the input of the main counter 16. If the first trigger 10, then the priority key 14 is triggered and connects the trigger output 10 to about the input of the counter 16. The counting process of the number of pulses of the first sequence begins. In this case, the priority key 14 switches the comparison logic 15 to the comparison of the states of the flip-flops 11-13, but the comparison does not start, since the single logic signal from the control input 5 prohibits this operation. After the measurement of the time interval is completed, the circuits I 1-4 are closed. The zero logic signal from input 5 activates the comparison logic 15, which compares in turn the state of the additional trigger 10 with the states of the additional triggers 11-13 each match the result of writing the unit to the refinement counter 18. After the comparison operation is completed, the converted time interval is stored as a binary code in the triggers 17, 19 and 10 and the main counter 16, the younger (first) bit of the binary number is stored in the trigger 17, the second in the trigger 19, and so on. In FIG. 2 a, b, the process of measuring the time interval iy with a duration of 21/4 T, where T is the period of counting pulses, is considered as an example. From fig. 2b it can be seen that three pulses go to the input of trigger 10. Since the trigger 10 before the measurement is in state 1, after the measurement is completed, 0 is recorded in it. Connecting trigger 10 to the main counter occurs after trigger 10 transitions from state "1 to state" O. From the output of the trigger 10 to the input of the main counter 16 receives one pulse. Trigger 12 and 13, the input of which receives signals from inputs 8 and 9, respectively, after the end of the measurement are in state 1, since two pulses arrive at their input (Fig. 26). The trigger 11 is in the "O" state, since three pulses are applied to its input (Fig. 2 b). Thus, the state of the trigger 10 coincides only with the state of the trigger 11, and, therefore, one is entered into the refinement counter 18. The price of each unit recorded in the auxiliary counter is equal. The price of each unit recorded in the main counter 16 is 2T. Thus, the total transformed interval recorded in the triggers 17, 19, 10 and the counter 16 is 21 / 4T. Claims The method of measuring single time intervals using several equally-spaced pulse sequences, including filling the measured interval with these sequences, calculating them and averaging the results of the calculation, which, in order to simplify the hardware implementation and shorten the measurement time, determine and fed to the input of the counter pulse sequence, which begins first in relation to the beginning of the measured interval, for each code pulse counter is incremented by the sequence number equal to the number of pulse sequences, was determined and recorded in a counter coli. . honestly, the pulses from the remaining pulse sequences, which are missing from the end of the last pulse of the first pulse sequence to the end of the measured interval. Sources of information taken into account in the examination 1, USSR Copyright Certificate No. 390501, cl. G 04F 10/00, 1971. Syros FIG.