SU392433A1 - MEASURING MEDIUM FREQUENCY - Google Patents

Description

one

The invention relates to a measurement technique and can be used to measure the average frequency of a random sequence of pulses in instruments for recording ionizing radiation.

The known devices for continuous measurement of the average frequency of the pulses, in which alternately switched counters are applied, have a considerable measurement error.

The proposed device provides improved measurement accuracy due to the fact that the pulse counter triggers through logic circuits AND are combined into a shift shift register in half, the shift input of which is connected to the timer and through the delay line with the counting inputs of the intermediate memory triggers of the information output block, potential the inputs of which are connected to the corresponding outputs of the triggers of the counter-register.

The block diagram of the meter is shown in the drawing.

The counting inputs of the triggers / are interconnected through logic circuits “AND 2, connected by their other inputs to the outputs of previous triggers, the separate inputs of which are connected in pairs to the corresponding outputs of the subsequent triggers via logic circuits“ AND 3, thus

counter-register 4. The shift of the latter connects the other inputs of the AND 3 logic circuits with a timer (clock generator) 5, which through the time delay device on the one-oscillator 6 and the locking key 7 is connected to the counting inputs of the triggers 8 of the information output unit 9. The control inputs of the trigger triggering circuits 5 are connected to the corresponding trigger / counter-register 4 outputs.

The input pulses with an average frequency p are fed through the switch 7 to the counter-register 4. The counting of the pulses takes place during the time interval T, set by timer 5.

The pulse of timer 5 is fed to the one-shot 6 and through the circuits 3 to the triggers /, shifting the information to the left by one bit, i.e. the division of the accumulated number of pulses L by half. In this case, the key 7 is blocked

pulse one-shot 5 and does not pass the input pulses to the counter-register 4. The rear edge of the pulse one-shot 6 translates the triggers 5 in the state identical to the states of the triggers 1 of the counter-register 4.

After the end of the one-shot pulse 6 and the opening of the key 7, the counter 4 again counts the input pulses, the number NZ of which is added to the result of

accounts and divide, -. Thus, to kon3

tsu second interval T in the counter-register 4

N,. ,, accumulates -2 pulses which

after the new division, twice again appears in block 9 as a number

V, (N,. 2 V 2 V

After a few ticks,

L, +

+ ...

eight

which is the average result of counting at adjacent time intervals with a number of weighting factors: 1.1 / 2, .1 / 4, 1/8, ...

Subject invention

A mid-frequency meter containing a trigger pulse counter, an information output unit and a timer, characterized in that, in order to improve the measurement accuracy, the counter triggers through the AND logic circuits into a double shift register, the shift input of which is connected to the timer and through a delay device with counting inputs of intermediate memory triggers of the information output unit, the potential inputs of which are connected to the corresponding outputs of the register counter triggers.