SU1479894A1 - Pulse duration meter - Google Patents

Abstract

The invention relates to a measuring technique and can be used to measure the duration of pulses of small amplitude, comparable to the noise level. The aim of the invention is to increase the reliability of measurements with a small signal amplitude. In order to achieve the goal, a collective block 7 and a comparator 9 are added to the device, which block the output signal at small amplitude values of the pulses at its input by limiting the absolute value from the bottom relative to the threshold. In addition, the device contains a delay line 1, a key 2, a limiter 3, a Schmitt trigger 4, a peak detector 5, a voltage divider 6, a differentiating chain 8, and an inhibitor pulse generator 10. 3 il.

Description

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This invention relates to a measurement technique.

The purpose of the invention is to increase the reliability of measurements of the pulse duration at small values of the input signal.

Figure 1 shows the structural electrical circuit of the proposed device, figure 2 shows the input signal for different cases} in Figure 3. The electrical diagram of the collecting unit. The device consists of a delay line 1, a key 2, a limiter 3, a trigger 4 Ymitta, and a peak the detector 5, the voltage divider 6, the collecting unit 7, the differentiating chain 8, the comparator 9, the inhibitor pulse generator 10, the pins 11 and 12 are the signal and control inputs of the device, respectively, and the output 13 is its output, while the delay line 1 , entrance which is a signal input 11 of the device, a key 2, a limiter 3, a Schmitt trigger 4, the output of which is the output 13 of the device, and a differentiation chain 8 are connected in series, where the output of the latter is connected to the first input of the inhibitor pulse forcing 10 and the zero zero input of the detector 5 whose input is connected to the signal input 11 of the device, the first inputs of the collecting unit 7 and the comparator 9 are connected to the control input 12 of the device, and the second inputs to the output of the voltage divider 6, the output of the collecting unit 7 connected to the second input of the limiter 3, and the output of the comparator 9 is connected to the second input of the driver 10 prohibition pulses. Block 7. contains two diodes 14 and 15, the cathodes of which are combined and serve as an output, and the anodes are the inputs of the block.

The device works as follows.

In the absence of a pulse, the input voltage is completely determined by the level iy (Fig. 2, pos. 1). As a result of the operation of the detector 5 and divider 6, the voltage level Ufl0pi is applied to the first inputs of the collecting unit 7 and the comparator 9 (LY 11Y.: 1 is the relative level set by the voltage divider 6. To the second inputs, collect 9894 2

The unit 7 and the comparator 9 are supplied with the control input 12 of the device with the voltage Un0p min. If 5 ipor. min. and. the output of the comparator 9 is kept high and the inhibitor pulse driver 10 leaves key 2 turned off. The collecting unit 7 (FIG. 3) implements the lower bound of the Uncp level, at the level of Unt, p. / min and gives the voltage U „or. „„ „With Unpp, mission U, ep., At the second input of limiter 3, on the first input of which there is

5 zero potential, as key 2 is turned off. As a result, the output of the limiter 3, and, therefore, at the output 13 of the device, the pulse is absent. If there is an input 11

0, a pulse device (Fig. 2, pos. II), as a result of the operation of the detector 5 and divider 6, the first inputs of the collecting unit 7 and the comparator 9 are energized Unop.

5 o (-UM., Where UBX1 (figure 2, position II) is the amplitude of the input signal.

If the amplitude of the UBM exceeds

U

0

since then mi and

, a U

then, dyne ipom (Figure 2,

pos. Ii) then from the collecting unit 0 7 to the input of the limiter 3 the voltage Uno is applied. . However, the formation of a pulse with a duration of t.j-t does not occur (while the true duration of the pulse is C t4-tj), so the results of the comparison of the comparator 9: U 00p. The lengths are &0; and key 2 is not included. When the condition U, j0p Unop is fulfilled, the comparator 9 switches, and on the falling edge of its output signal, the inhibitor pulse generator 10 switches on the key 2, and from the output of the collecting unit 7, the level U, no is output to the limiter 3, and at the output of the device with some delay a pulse with duration Ј t6-t5 (Fig. 2, pos. III) will be generated, on the falling edge of which differentiating chain 8 prepares the device for 0 to the next measurement: through the inhibitor pulse generator 10, the key 2 is turned off and installed standing peak detector 5.

Claims (1)

Invention Formula A device for measuring pulse duration, containing a line % Unop min Neither pos.7 to t, t2 ь t о t5t 6 t MB- l. W 1 and o Phage.Z Unop.f