SU523384A1 - Digital Time Ratio Meter - Google Patents

Description

one

The invention relates to digital measurement technology and can be used to measure the pulse ratio of telephone dialers.

Digital time ratio meters are known using the two-pulse code division method.

Also known is a digital time ratio meter, which includes a time interval meter, two counters, one of which is connected to the output of the time interval meter, a valve, one input of which is connected to the output of the first counter, a collective element and a delay element.

However, such a meter is characterized by low reliability and relative complexity.

The purpose of the invention is to simplify the device and increase its reliability.

To do this, a subtractive counter is introduced into the proposed meter, the counting input of which is connected to the second output of the time interval meter, the installation input with the valve output, and the output through the delay element is connected to one of the inputs of the collecting element and to the second counter input, and the control output of the interval meter time is connected to the second input of the collective element, the output of which is connected with the second input of the clanan.

The drawing shows a diagram of the device. The digital time ratio meter includes a time interval meter 1 with a counter 2 at the output, equipped, besides the input Bxi, with an additional input Bx2 and a second output connected to the counting input of the reading counter 3, the installation inputs of which are connected 5, the first input of which is connected to the control output of the meter 1 time intervals. The output of zeroing the deducting counter. 3 is connected to the input of the delay element 6, the output of which is connected to the input of the result counter 7 and to the second input of the collecting element 5. The meter works as follows. At the start of the meter, the time interval TI applied to the first input is measured, and the measurement result NI is accumulated in counter 2. At the end of the measurement, the first time interval TI from the control output of meter 1 time intervals through the collecting element 5 is

the second valve input 4 receives the write resolution command, and the measurement result of the NI is recorded in the subtractive counter 3. The write permission command is removed at the output of the collecting element 5 via

the time determined by delay element 6 and

sufficient to ensure that the NI measurement result is recorded in the subtractive counter 3.

When the measurement of the time interval TI is completed, the measurement of the second time interval T applied to the second input begins.

After the subtractive counter 3 arrives at the counting input, the pulses of the selected exemplary frequency 1o, determining the measurement error, the number of which is equal to the NI measurement, a signal is generated at the zero output of the subtractive counter 3 to the input of the result counter 7 and to the input of the collective element 5. The measurement result, L, is again recorded in subtractive counter 3, and the subtraction process is repeated. This continues until the end of the time interval TZ.

Thus, if for the filling of the time interval TS the sample frequency fo., Is selected, then during the time T the pulses arrive at the input of the counter 2. At the output of delay element 6, as many pulses are formed as the number of times contained in the number N2. Counter 7 shows the number NZ

foj

Lz

N, foJ

N.

sample time interval measurement frequency

the sample frequency for measuring the time interval Ha, is selected based on the required measurement accuracy;

a number proportional to the ratio of the measured intervals.

F o rmu l invention

A digital time interval ratio meter containing a time interval meter, two counters, one of which is connected to the time slot meter output, a valve, one input of which is connected to the first counter output, a collecting element and a delay element, characterized in that

device and increase its reliability, introduced subtractive counter, the counting input of which is connected to the second output of the meter time intervals, the installation input from the valve output, and the output through the delay element connected to one of the inputs of the collecting element and the input of the second counter, and the control input of the meter time intervals connected to the second input of the collecting element, the output of which

connected to the second valve inlet.