SU970303A2 - Device for measuring time interval - Google Patents

Description

The invention relates to measuring equipment, automation, and can be used in cases where it is necessary to sample the first and last pulses from a series of pulses and accurately measure the time interval between their centers and in the case when the time interval between pulses in series and between series, and the duration of the pulses vary. According to the main author. St. No. 851330, a device for measuring the time interval, which contains a clock pulse generator, six AND elements, five triggers, two OR elements, a digital counter, a threshold amplifier, and a HE element 1, is known. A disadvantage of the known device is that it has narrow functionality, since it allows sampling only the central pulses from the packet and measuring the intervals between their centers and does not allow sampling the first and last pulses from the packet and accurately measuring the time interval. between them. The purpose of the invention is to expand the functionality. The goal is achieved by the fact that the device for measuring the time interval contains a clock pulse generator, the output of which is connected to the input of the first trigger and the first input of the first element And, the second input of which is connected to the output of the second element and, and the output to the first input of the first element OR, the output of the first trigger is connected to the first inputs of the third and fourth elements AND, the outputs of which are connected to the inputs of the second element OR, the output of which is connected to the second input of the first element OR, the output is which is connected to the input of the counter, the second input of the third element And is connected to the output of the fifth element And, the second input of the fourth element And is connected to the output of the sixth element And, the output of the threshold amplifier is connected to the first inputs of the fifth and sixth elements And and the input of the second trigger directly and through the element NOT to the input of the third trigger, the first and second outputs of which are connected respectively to the input of the fourth trigger and the first input of the second element I, the second input of which is connected to the output of the fourth trigger, and tr tiy - to the first output of the second trigger and the second input of the fifth element And, the third input of which is connected to the first output of the fifth trigger, the second output of which is connected to the second input of the sixth (Element And, the third input of which is connected to the second output of the second trigger and input n In addition, six elements AND two elements and a counter are added, and the output of the threshold amplifier is connected by the first inputs of the first and second additional elements AND, the output of the element is NOT connected to the first input of the third additional element And, the second inputs of the first and third additional elements And combined and connected to the first output of the second trigger, the third input of the first additional element And connected to the first output of the fifth trigger, the second input of the second additional element And connected to the second output of the second trigger, the third inputs of the second and the third additional elements And are combined and connected to the second output of the fifth trigger, the outputs of the first and second additional elements AND are connected to the inputs of the first additional element OR, The output of which is connected to the first input of the fourth additional element AND, the second input of which is connected to you by the first trigger trigger, and the output to the first input of the second additional element OR whose output is connected to the input of the additional counter, the output of the third additional element AND is connected to the first input An additional element And, the second input of which is connected to the output of the fourth trigger, and the output with the first input of the sixth additional element And, the second input of which is connected to the output of the generator t frequency, and the output is connected to the second input of the second additional element OR.

Figure 1 shows the functions

device diagram / figure 2 - voltage plots.

The device contains a generator 1 clock pulses, the elements And 2-7, triggers 8-12, the element OR 13 fterchik 14, the threshold amplifier 15, the element NOT 1b, the element OR 17, the elements And 18-23, the elements (or 24 and 25, counter 26.

The device works as follows.

A bundle consisting of four pulses (Fig. 2a), applied to the input of the threshold amplifier 15, is converted by it into square pulses.

(Fig.26), which are fed to the inputs of the trigger 9, the elements 6,7,18,

19 and the NE element 16 (FIG. 2B) on the trigger 11 and the input element AND 22. Before the pulses arrive, the triggers 9-12 and the counters 14 and 26 are in the zero state. At the output of the trigger 9, pulses are generated (Fig. 21, (5), at the output of the trigger 12, pulses (Fig. 2e, 7 "), at the output of the trigger 11 pulses (Fig. 2e), and at the output of the trigger 10, pulses (Fig. .2i).

At the output of the element And 18, the first impulse of the pack is selected (Fig. 2k), and at the output of the element And 19, the last impulse of the pack (Fig. 2L) is released. The sum of these pulses is removed from the output of the element OR 24 (Fig. 2) A).

These pulses (FIG. 2I) at the output of the And 21 element are filled with the clock frequency (Fig. 20) allocated by the trigger 8 (Fig. 2n). The time interval between the end of the last but one and the beginning of the last pulses is separated by And 22 (Fig.2pT The pulse corresponding to this time interval is fed to the input of the element And 23, and the second input of the pulse pulses from the output of the trigger Y. The output of the element 23 is allocated a time interval (Fig. 2c), which is filled with a clock frequency and is output element And 20 (Fig.2t). Pulses from elements And 21

20 served on the element OR 25. With the output element OR 25 pulses

(Fig. 2s) are fed to the counter. 26. When the device passes the last pulse of the stack, a zero pulse trigger and a counter census pulse are generated.

The known device has narrow functional capabilities, since it allows sampling only central impulses from the pack and measuring the intervals between their centers, and in modern devices, for example for gravimetry purposes, it is necessary to select the first and last impulses from the pack and accurately measure the time interval between them.

The introduction of additional elements expands the functionality of the device, since in addition to extracting the central pulses from the cells and accurately measuring the time interval between them, it allows one to sample the first and last pulses and measure the time interval between the centers of these pulses, and the time interval and duration of the pulses in the packet may vary.

Claims (1)

1. USSR author's certificate No. 851330, cl. G 04 F 10/04, 1979. 17 #I h-1 G5 / Shgzh 3H 431 2 L 2: