SU744429A1 - Small time interval meter - Google Patents

Description

and the fourth elements AND-NOT respectively, the output of the second trigger is connected to the third input of the fourth element AND-NOT, the installation input “On the fourth counter is connected to the bus” reset meter, the count input of the fifth trigger is connected to the first output of the first trigger, and the output to counting the fourth trigger entry.

The device shown in the drawing.

The device consists of two discriminators of levels 1 and 2, a quartz oscillator 3, elements AND-NOT 4-7, counters 8-11, triggers 12-16, element I 17, delay element 18, inputs 19-21.

Measuring short intervals of time works as follows.

Before the measurement, the input 21 is signaled with a reset signal that triggers triggers 12-16 and counters 8-10. The signal from the second output of the trigger 14 through the delay element 18 and the element And 17 sets the counter 11 to the zero state.

The measurement starts when a start signal is applied to the input 20 of the device, which flips trigger 13. The signal from the output of this trigger permits the passage of the pulses of the quartz oscillator 3 through the elements AND NOT 4, 6 to the inputs of counters 8, 10, respectively, which begin to count time.

Irie increases (by module) the input pulse arriving at input 19 to the value and discriminator 1 is triggered by transferring triggers 12 and 14, while the signal from the first output of trigger 14 removes the ban on the passage of pulses of a quartz oscillator 3 through the element AND-HE 6 to the input of the counter 10. At the same time, the signal from the second output of the trigger 14 through the element 17 removes the signal to zero the counter 11, and the signal from the second output of the trigger 12 has the opposite effect, i.e. it prevents the passage of pulses of the quartz generator 3 through the element AND- NOT 7 to the input of counter 11 and simultaneously, through element 11, sends a signal to zero the counter 11. As a result of the introduction of the delay element 18, the signal from the trigger 12 changes earlier than the signal from the trigger 14, as a result of which the counter 11 continues to remain in the zero state nii.

The signal from the first output of the trigger 12 permits the passage of pulses from the crystal oscillator 3 through the AND-HE element 5 to the input of the counter 9. The countdown of time 4r1 begins.

The signal from the first output of the trigger 14 closes the NAND element 6 and the flow of pulses from the quartz oscillator 3 to the input of the counter 10 is stopped. In counter 10, a number proportional to time / n is stored.

As the input pulse decreases to modulus t / n, the discriminator 2 is triggered, and the trigger 12 returns to the initial state. The signal from the first output of the trigger 12 overturns the trigger 16 and prohibits the passage of pulses from the crystal oscillator 3 through the element AND- NOT 5 to the input of the counter 9. The counter 9 stores a number proportional to the time / s Spgnal from the second output of the trigger 12 prohibits the passage of the zeroing valve the counter 11 through the element 17 and at the same time permits the passage of the pulses of the crystal oscillator 3 through the element AND-NOT 7 to the input of the counter AND, which starts counting the time tz.

When the input pulse (magnitude) is repeated (modulo), the discriminator 1 re-triggers before f / n activates, which triggers trigger 12, the first output of which is triggered by AND-HE 5 and the counter 9 starts counting the time, and before that, as before it was indicated above, in the counter 9 the number proportional to the till time was stored, i.e., in other words, the counter 9 starts to summarize u and / „a.

The signal from the second output of the trigger 12 closes the element AND-NOT 7 and through the element 17 and 17 wraps the counter 11. As the input module decreases

pulse up to the value of / 7p, the discriminator 2 is triggered and returns the trigger 12 to the initial state. As a result, counter 9 stops and information is stored in it, proportional to time

AH + I2, and the counter 11 starts counting the time tz. Non-temporarily, trigger 16 returns to the initial state, which triggers trigger 15, which determines the presence of a "bounce of the measured pulse. In the future, due to the control signals 22 and 23, the trigger 15 is held in this state. Further, the operation of the device is repeated.

Claims (2)

1. USSR author's certificate number 419813, cl. G 04F 10/02, 1971. 2. USSR author's certificate number 527693, cl. G 04F 10/04, 1975 (prototype).