SU391728A1 - _ LIBRARIES "'] - Google Patents

Description

one

Digital time ratio gauges are known that contain a time interval meter With an output counter, a collective element, a result counter, a code comparison unit, a delay element storing a register, the installation inputs of which are connected via valves to the counter output.

The aim of the invention is to increase the reliability of the meter.

The goal is achieved by the fact that the outputs of the memory register are connected to the first inputs of the code comparison unit, the second inputs of KiOTOporo are connected to the outputs of the counter, the output of the comparison block is connected to the input of the result counter and through the collecting element to the meter inputs of the counter, the second inputs of the valves directly, and the collective element through the delay element connected to the control output meter time intervals.

The drawing shows the block diagram of the proposed digital meter.

The digital meter includes a meter / time intervals with a counter 2 at the output, provided, in addition to the usual input "Input 1, additional" input 2. The outputs of the counter are connected via valves 3 to the memory register 4 and the code comparison unit 5, to the other input which outputs are connected 4 storage register. The output of the code comparison unit is connected to the input of the result counter 6 and through the collecting element 7 to the installation outputs of the counter 2. The other input of the collecting element 7 through the delay element 8 is connected to the control device of the time interval meter, the output of which is also connected to the other inputs valves 3.

After starting the device, a measurement is performed in a known manner, the time interval TI, applied to input 1. The measurement result Ai is accumulated in the counter 2. The command to end the measurement of the first time

-Ti intervals from the output of the control unit of the time interval meter 1B to the measurement result .Vi is written to the memory register 4. Counter 2 is reset to the initial zero state after the time determined

a delay element 8 sufficient to ensure that the result of Al is recorded in register 4. The measurement of the second time interval T2, applied to input 2 begins. In the process of filling the counter with 2 pulses of the selected

of an exemplary frequency determining the measurement error, the code dialed in it is continuously compared with the number NZ recorded in register 4. At the moment of equality, the comparison block 5 codes forms

impulse, which, on the one hand, resets counter 2 to the initial zero state, and on the other hand, sets the input of counter 6 to the result. After this, the filling of the counter 2 continues again from zero until equality is achieved. The process then repeats. This continues until the end of the time interval TZTIM, if the sample frequency fo2 is selected to fill the time interval TZ, then during the time T the Nz Tzhz of pulses will arrive at the input of the counter 2. The comparison unit of 5 codes will generate so many pulses at the output, how many times the NI number is contained in the number N. Consequently, the measurement result taken from the output of the counter will be the number

L Al .Zj.

L

N / 01

where / 01 is the sample frequency when measuring the time interval T.

This expression indicates that the result of measuring the VL; The number is proportional to the ratio of the two time intervals.

Subject invention

Digital time ratio meter, containing a time interval meter with an output counter, a collective element, a result counter, a code comparison unit, a delay element, a crushing register, whose installation inputs are connected via valves to the counter output, characterized in that, in order to increase reliability , the outputs of the memory register are connected to the first inputs of the code comparison block, the second inputs of which are connected to the outputs of the counter, the output of the block

comparison is connected to the input of the result counter and through the collecting element to the installation inputs of the counter, the second inputs of the valves are directly, and the collecting element through the delay element is connected

to the control; to it the output of the time interval meter.