SU1624360A1 - Averaged pulse frequency meter - Google Patents

Abstract

The invention relates to a measurement technique and can be used in radioisotope devices in the processing of pulses with a statistical distribution in time. The aim of the invention is to improve measurement accuracy and speed. The average pulse frequency meter contains a pre-counter 1, a counter 2 of the time interval, an OR 3 element, a control trigger 4, an adjustment trigger 5, a control trigger 6, a delay element, an IS-HE element 8, a measuring counter 9, a Start button 10. The introduction of counters 9 and 2 made it possible to more accurately form the measurement time. The introduction of the installation trigger 5 made it possible to shorten the time for bringing the circuit to the initial state. 2 Il.

Description

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The invention relates to a measurement technique and can be used in radioisotope devices in the processing of pulses with a statistical distribution in time.

The aim of the invention is to improve the accuracy and speed of measurement. Figure 1 shows the structural diagram of the proposed device; figure 2 - timing diagram of the device.

The pulse average frequency meter contains a pre-counter 1, a counter 2 of the time interval, an OR 3 element, a control trigger 4, an adjustment trigger 5, a control trigger 6, a delay element 7, an IS-NE element 8, a measuring counter 9, and a Start button 10.

Synchronized installation trigger 5 is connected to the Start button 10, and the inverse output is connected to the installation input of the pre-counter 1 and the reset inputs of the triggers 4 and 6 and the measuring counter 9, the blocking input of which is connected to the inverse output of the trigger 4, and the counting input - with the output of the And element -ONE 8. Pre-counter input 1 is a clock input of the device, and the output is connected to the synchronous input of trigger 6 and the input of counter 2, the overflow output of which is connected to the synchronous input of trigger 4. The output bus of counter 2 is connected to moves of the element OR 3, the output of which is connected to the second input of the element AND-NOT 8. The output of the trigger 6 is combined with the reset input of the counter 2 and the input of the delay element 7, the output of which is connected to the reset input of the installation trigger 5. The first input of the AND-HE element 8 input device.

The device works as follows.

When you press the Start button 10 on the synchronization input of the trigger trigger 5, a differential from 0 to 1 is created (fig.2b) and a zero level appears on its inverse output (fig.2b), which sets the trigger 4 on o (fig.2i) and 6, measuring counter 9 and in 1 preliminary counter 1.

When the control trigger 6 is set to O, the signal from its output brings the counter 2 to the zero state and, via delay element 7 (FIG. 2k), resets the installation trigger 5, then resets it to the nearest trailing edge of the clock pulse (FIG. 2a). preliminary counter 1.

The falling edge of the signal from the output of the pre-counter 1 is necessary for triggering the counter 2, but does not trigger it, since the signal from the output of the control trigger 6 (FIG. 2d) keeps the counter 2 in the zero state until the trigger 6 transitions to the single state. After that, the signal is removed,

setting counter 2 to zero.

The nearest trailing edge from the output of the preliminary counter 1 (FIG. 2d) passes to the input of the counter 2, and begins

0 filling. When non-zero information appears in the counter 2, a single signal appears on the output bus and at the output of the element OR 3 (FIG. 2L), which allows the input sequence (FIG. 2g) to pass through the AND-HE element 8 (FIG. ) to the counting input of the measuring counter 9. At the input of the blocking of the measuring counter 9 there is a resolving unit level.

0 When counter 2 overflows, the overflow signal (Fig. 2c) flips control trigger 4 to one state. The zero level at its inverse input blocks measuring counter 9, in which

5 the moment the number of input pulses has accumulated during the time from the appearance of non-zero information in counter 2 and until it overflows.

Thus, the resolution of the start of the account in the measuring counter 9, using nonzero information in the counter 2, makes it possible to more accurately form the measurement time and, therefore, increase the accuracy of the frequency measurement by the whole device. In addition, the introduction of setpoint trigger 5 makes it possible to shorten the time for bringing the circuit to the initial state.

Claims (1)

Claims The average frequency meter of pulses containing a pre-counter, a time interval counter, first and second control triggers, a measuring counter, a start button, a delay element, and an NAND element whose input 5 is a device input, wherein a pre-counter installation input, the input of which is a clock input of the device, is integrated with the reset inputs of the first and second control flip-flops and 0 of the measuring counter, the counting input of which is connected to the output of the NAND element, the output of the second trigger is connected to the input of the delay element by the reset result of the counter of the time interval, the counting input of which is combined with the output of the preliminary counter and the synchronization of the second overflow trigger from the sync Rove of the first control trigger; the lock input of the meter is connected to the inverse output of the first control trigger, characterized in that. that, in order to increase the accuracy and speed of measurement, the OR element and the installation trigger, the synchronous input of which is connected to the Start button, are additionally introduced, the reset input is the output of the delay element and the inverse output with the reset input of the first control trigger; the inputs of the OR element are connected to the output bus of the time interval counter, and the output is connected to the second input of the OR NOT element.