SU423096A1 - MEASURING TIME INTERVALS - Google Patents

Description

one

The invention relates to electrical measuring equipment and can be used to simplify the design and extend the field of application of digital time interval meters.

The well-known time interval meter, comprising a selector, coincidence circuits, a pulse counter, triggers, multivibrators, a housing, a dongle, current stabilizers, and a storage capacitor, is characterized by a sophisticated design and narrow scope.

The proposed meter differs from the known ones in that the selector output is connected to the input of the first multivibrating standby and the first input of the first coincidence circuit, the second input of which is connected through the first trigger to the output of the first multivibrator, and the output to the counter input and the first input of the third trigger, the second input of the comparator connected to the output, and the output from the first input: the second coincidence circuit, the second input of which is connected to the second input of the selector, and the output to the control input of the charging current stabilizer, output a house connected to the inputs of a comparator, a discharge switch, a storage capacitor and a discharge current regulator, whose control input is connected to the output

a second multivibrator standby input connected to the input terminal.

Such an embodiment of the device allows to simplify its design and expand the scope of application.

The drawing is a block diagram of the proposed meter.

The time interval meter consists of the selector 1, the first coincidence circuit 2, the counter 3 shshuls, the first waiting multivibrator 4, the first trgger 5, the second trigger 6, the second waiting multivibrator 7, the third trigger 8, the second coincidence circuit 9, the comparator 10, the split key 11, a discharge current regulator 12, a charge current stabilizer 13, and a storage capacitor 14.

The meter works as follows. Before the measurement cycle, a reset pulse is applied to the meter, setting the counter 3, the triggers 5, 6 and 8 to the zero state and discharging the storage capacitor 14 using the key 11.

The pulse, the duration of which represents the measured time interval, is fed to the input of the trigger 6 and sets it to the state in which the selector 1 is open, and the pulses of the reference frequency arrive at the input of the matching circuit 2 and the waiting multiplier 4. The first pulse of the reference frequency does not pass through the matching circuit 2, but it starts the standby multivibrator 4, with the falling edge setting trigger 5 to the state in which the matching circuit 2 is open. The second and all subsequent pulses arrive at the counter 3 and to the input of the trigger 8, which is set to one. At the output of the coincidence circuit 9, a pulse is formed, the duration of which is equal to the time interval from the beginning of the measured time interval to the first pulse of the reference frequency entering the counter. This impulse includes a charge current stabilizer 13 and a storage capacitor 14, charged to a value of U- -----, where / s -

Si

the charge current, Aij is the pulse duration, Cn is the magnitude of the active capacitor 14.

The falling edge of the pulse Tx is started by the multivibrator 7, which turns on the discharge current regulator 12. The storage capacitor 14 begins to discharge, and the voltage across it from the value of Ui begins to decrease linearly. At the moment of equality, a pulse is formed at the output of the comparator 10, which sets the triggers 6 and 8 to the zero state. Thus, the measurement interval is increased by

d / U - Uu f ai2 -;: - if you select the value of voltage bc

Cii2 / o

4 / o, then

M

С „2 /„ j

Sn

CH D, -

2/0

Nredmet of the invention

The time interval meter, containing the selector, coincidence circuits, pulse counter, triggers, multivibrators, comparator, bit switch, current stabilizers and a storage capacitor, is distinguished by the fact that, in order to simplify the design and extend the application, it has an output the selector is connected to the input of the first standby multivibrator and the first input of the first matching circuit, the second input of which is connected through the first trigger with the output of the first multivibrator, and the output to the counter input and the first input of the third trigger and the output to the first input of the second coincidence circuit, the second input of which is connected to the second input of the selector, and the output to the control input of the charging current regulator, the output connected to the inputs of the comparator, a dongle switch, a storage capacitor and a discharge current regulator, the control input of which is connected to the output of the second standby multivibrator, the input connected to the input terminal.