SU1200234A1 - Meter of short time intervals - Google Patents

Abstract

The invention relates to measuring TexHiQce and can be used to measure the duration of single pulses or a time interval. The expansion of the range to smaller measured intervals and an increase in the accuracy of measurements are achieved by introducing a priority decoder and h triggers into the meter. The meter contains partitioned delay lines 1 and 2, h-elements 3.1-3. and. coincidence, priority decoder 4, h-triggers 5.1-5.h and Schwie Cat 6. Delay lines 1 and 2 contain i-identical sections each, with the delay time of one section of line 2 shorter than the time delay of section of line 1 by the value of one quantization step. Match element 3 and trigger 5 can be executed, for example, on a tunnel diode, to change the state of which it is necessary that a signal with a logic level 1 be connected to two inputs of a match element 3. In order to save the changed state of a tunnel diode, the signal with a logic level 1 occurred at one of the outputs of the match 3 element. The priority decoder 4 generates a decimal code corresponding to the highest sequence number of the trigger 5, which has not changed its state and output otorrhea there logic level ON. The value of this code, induced on indicator 6, is proportional to the duration of the measured time interval. 2. Hundred 9

Description

The invention relates to a measurement technique and is intended to measure the duration of a single pulse or time interval. The aim of the invention is to expand the range to smaller measured intervals and to obtain measurement accuracy. FIG. 1 shows a functional scheme for measuring short time intervals ;, FIG. 2 - time diagrams of his work. The device contains two partitioned delay lines 1 and 2 of the rt.-elements 3.1. 3 .n match, priority decoder 4, triggers 5.1-5. And indicator 6. Delay lines 1 and 2 contain n identical sections each, and the delay time one section of line 2 is shorter than the delay time of section 1 of 1 by the value of one quantization step. Match element 3 and trigger 5 can be scaled, for example: on a tunnel diode, to change the state of which it is necessary that the signal with a logic level 1 be on two inputs of match element 3, and changed to save

In this case, it is sufficient that the signal of the logic level 1 be at one of the inputs of the coincidence element 3.

The priority decoder 4 generates a decimal code corresponding to the input with the highest number at which the logic level is 0.

The device works as follows.

Before measurements are started, a pulse is applied to the Reset input (Fig. 2a) and triggers 5.1-5. and the initial state is set when the output level is logical 0. At the same time, at the Start input, the logic level is 1 (Fit.25), and at the Stop input, the logic level is O (Figure 2e).

At the beginning of the measured time interval at the start input, a logic level O is set up, which with a delay equal to t introduced by one section of the delay line 1 appears on the first inputs of elements 3.1-3. matches (Fig. 2.ff, & g). At the end of the measured interval at the entrance, the Stop is set

Claims (1)

Invention Formula Measuring a short time interval | containing two partitioned delay lines and and coincidence elements, the first inputs of which are connected to the corresponding outputs of the first split delay section, the input of which is connected to the meter start-pulse bus, so that In order to expand the measurement range, a prioritized decoder, the output of which is connected to the indicator input, and triggers, the first inputs of which are connected to the meter reset bus, are entered into it, the second inputs are connected to the outputs of the corresponding matching elements, and the forward the outputs are connected to the inputs of the priority decoder, the outputs of the second sectioned delay line are connected to the second inputs of the corresponding elements match, and the input is connected to the stop-meter bus. 41 is a logic level 1, which with a delay t introduced by one section of line 2, delays appear successively at the second inputs of elements 3.1-3 and a match (Fig. 2e, x, j, u). At the point in time when the level of logic 1 coincides at the two inputs of element 3 (for example, at element Z. and coincidence, Fig. 2, and.), Then at the output of this element of coincidence a pulse is formed (Fig. 2 K), which changes the state of the corresponding trigger 5.i (fig. 2l) .; The duration of the measured interval in this case is equal to 1 j, (T -11) tn where ti is the largest order of the number of the trigger 5, the output of which retained the logic level O. For the example shown in FIG. 2 hi h - 1. Priority decoder 4 generates a decimal code corresponding to the greatest 20 order number of the trigger 5, which has not changed its state, and the output of which is a logical O level. The value of this code displayed on the indicator 6 is directly proportional to the duration of measurement js temporary tutorial F (/ r.2