SU424081A1 - MEASURING MEDIUM FREQUENCY PULSES - Google Patents

Description

one

The invention relates to the field of electrical measuring equipment and can be used to create devices for recording the dynamics of ionizing radiation of radioactive isotones.

Known mean pulse frequency meters based on averaging successive counting results. and containing a pulse counter, a timer, a delay node, an information output unit, and an input circuit of a groundwire, have a large dynamic error.

In order to reduce the dynamic measurement error of the average frequency of the pulses, varying in V |, in the measurer proposed from: the input circuit is interrupted connected to several pulse counters, the reset outputs of which are connected to the switch connected through the delay device with a timer, thereby realizing symmetrically (on the form of the weight function of averaging.

In the drawing, the block diagram of the described device containing the logic circuit 1 is locked, the counters are 2 pulses, the logic block 3 "OR, the logic block 4" And, the information output block, made in the form of a register 5 with output conversion to analog or digital form , timer 6, delay device 7, switch 8 and driver 9 pulses.

The device works as follows. The input pulses with frequency n are fed to the normally open inhibit circuit 1 and from its output to the inputs of counters 2. Timer 6 outputs control pulses with a time interval T. The timer pulse resets register 5B to zero and locks the input circuit of the locked 1 at time. m pulse generator 9, unlocks the circuit "And block 4 and, delayed in the device 7 for a time approximately equal to half the pulse duration of the driver 9, enters the switch 8. The switch generates a reset pulse to the zero state of the next counter 2. At the same time, the number accumulated in this counter at the time of locking the circuit 1, through the circuits "OR block 3 and the circuits opened by the pulse of the imager 9" And block 4 are written in parallel code into register 5.

At the end of the impulse pulse shaper 9, this counter starts counting from zero, and the remaining counters continue to accumulate impulses.

The second timer pulse resets the register and through the switch 8 the next counter, rewriting the number accumulated in it into the output register 5. Thus, each counter 2 accumulates the pulses during the cycle of operation of the colmutagor 8, i.e.

K.T. time, where / С is the number of counters 2. In this case, register 5 displays information on the number

pulses received at the meter input during the CT time:.

Moreover, this information is updated at each time interval T. As a result, the successively displayed numbers correspond to the average frequency of the pulses measured during the time interval of the CT, which is discretely shifted by the value T. Due to this, the rectangular (symmetric) form of the weight function of averaging is realized Provides a reduction in dynamic measurement error.

Subject invention

A pulse average frequency meter containing a inhibit logic loaded on parallel connected pulse counters and a timer to the output of which is connected an input of a delay node and a control input of an information output unit, characterized in that, in order to reduce the dynamic measurement error, it is equipped with blocks logic “And and“ OR, a switch and a pulse shaper, and the reset inputs of pulse counters are connected to the outputs of the switch, the input of which is connected to the output of the delay node, and the outputs of the counters through series-connected blocks of logic circuits "OR and" And the bit is connected to the input of the block

information output, another input of the circuit “And through the driver | pulses connected to the output of the timer.

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