SU559218A1 - Selective time meter - Google Patents

Description

The invention relates to measurement. ; technique — and can be used in time series,

Intertime meters are known that operate on the principle of a continuous 5 count, 1.

A selective time interval meter is known, which contains a sequential measuring pulse generator, metering unit and pulse counter 2 .10

The disadvantage of this type of meter is a relatively low noise immunity in the presence of impulse noise at the input.

The purpose of the invention is to improve the accuracy 15 of the noise immunity of the device.

For this purpose, a reversible counter, a count of the number of measurement pairs, an And circuit, a trigger with separate inputs, a transfer unit and an adder, with 20 inputs of the reversing meter, are connected to the dispenser output, its senior bits and the trigger output with separate inputs are connected to the inputs of the dispenser; And, the output of which is connected to the transfer unit and to the input of the

The bit of the number of measurement pairs, the highest bit of which is connected to the metering unit, all bits of the pulse counter are connected to the accumulator through the transfer unit, and the most significant bit of the pulse counter is connected to the trigger input with separate inputs.

The drawing shows a block diagram of the proposed device.

The selective time interval meter consists of the generator 1 of measuring pulses, the metering device 2, the counter 3, the number of measurement pairs, the reversing one, the counter 4, the circuit 5 AND, the counter 6 pulses, the transfer unit 7, the adder 8, the trigger 9 with the radial inputs, the measuring bus 10 ,

Claims (2)

The generator 1 through the dispenser 2 is connected to the inputs of counters 4 and 6. The higher bits of counter 4, the output of flip-flop 9, whose input is connected to the high discharge of counter 6, and the bus 10 are connected to the inputs of circuit 5. The output of circuit 5 is connected to the input: account 3 and block 7. The highest bit of the counter 3 is connected to one of the inputs of the dispenser 2, the other input of which is connected to the bus 10. The counter 6 is connected through bit 7 to the bit to the adder 8. The work of the proposed selective time interval meter is based on the measurement time intervals by filling them with I m validation pulses with a subsequent assessment of the reliability of each pair of consecutive measurements and averaging of reliable reputations accumulated in the adder. The criterion of validity is the fulfillment of the following conditions:, (nj-Hj,) A, I. - the number of measurement pulses in the first measured interval; q, is the number of measuring pulses in the ffTOpOM measured interval} and the number of pulses in the measured interval; d - the mass difference between the number of pulses of two measurements. The selector-1 time interval meter works as follows. In the initial state, the dispenser 2 closes the access of the measuring impulses from the generator 1 to the inputs of counters 4 and 6. The counters 3 and 6j of the adder 8 and the trigger 9 are in the zeroed state. Counter 4 is in addition mode and the number d is written on it. The first measured time interval is fed to the bus 10 of the metering unit 2, while the metering unit 2 passes MJ measurement pulses from the generator 1 to the inputs of counters 4 and 6. After passing through the first measured time interval, the number 4 will be recorded as L + Hi Pinch 6 - the number of HJ. Before feeding the second measured time interval, the counter 4 is transferred to the subtraction position. After passing the second time interval on the counter 4, the number 6 will be written on the counter, the number And. I ,,. If the criterion of validity is fulfilled, counter 4 will be written down in the range from d to 2 D, and counter 6, having a volume of 2 sec., will not overflow, as a result, the trigger O is ostet in its initial state, and Nmlushs with 1liny Yu on the counter and bpok 7, with the number and. n from counter 6 will be transferred to summgf 8. If not fulfilling at least one of the conditions (l), (2) scheme 5 does not miss the auxiliary signal at the input of counter 3 and lok 7, the transfer occurs, the results of these two measurements} Sy void. Thus, on the adder 8, only reliable results are accumulated. The use of the invention will allow measurements of time intervals with high accuracy in the conditions of asynchronous impulse noise. Claims of the invention A selectable time interval meter containing a series-connected measuring pulse generator; a metering device and a pulse counter, characterized in that, in order to improve accuracy and noise immunity, a reversible counter, a counter of the number of measurement pairs, an AND circuit, a trigger with separate inputs, a transfer unit and an adder are entered into it, the reversible counter input being connected to the metering output, higher bits and trigger output with separate counter inputs-. ka are connected to the outputs of the circuit And, the output of which is connected to the transfer unit and with the input. The house of the counter of the number of measurement pairs, the highest bit of which is connected to the dispenser, all bits of the counter of impulses are connected to the adder via the transfer unit, and the most significant bit of the counter of impulses is connected to the trigger input with separate inputs. Sources of information taken in. attention in the examination: 1. Gitis EI. Information converters for electronic digital computing devices Energie M. 1970, p. 224. 2.Valitov R.A., Sretensky V.N. Radio measurements, Owls. Radio, M., 197O, p. 586.