SU951230A1 - Time interval meter - Google Patents

Description

The invention is in electrical measurement technology and is intended for use in instrumentation.

The time interval meter is known, in which the image movement on the oscillographic indicator screen occurs by rotating the analog (continuous phase shifters t J). The closest technical solution to this invention is by technical essence and dos: the time result meter, the frequency block, digital indicator, phase shifter , two frequency divider and oscillographic indicator 2j.

However, in known devices, with large durations of the signals under study, it is necessary to make many turns of the phase shifter in order to shift the signal on the screen. The offset of the signal by means of multiple turns by the phase shifter makes the measurement very long.

The purpose of the invention is to increase speed.

This goal is achieved in that the time interval meter containing a block of frequencies, the first output of which is connected to a digital indicator through a logical frequency discriminator and a reversible counter, the second output is connected through a series, connected frequency divider and control object connected to the first input of the display indicator, the third exit is through an

The 10 phase shifter is connected to the second input of the logical frequency discriminator, the second input of the oscillographic indicator is connected to the output of the second frequency divider, a pulse phase shifter is inserted between the analog phase shifter and the second frequency divider, and a controlled frequency generator, the output of which is connected to the control Enter a pulse phase shifter and to senior bits of a reversible counter.

The drawing shows a structural diagram of the meter time intervals.

The meter contains a block of 1 frequency, analog phase shifter 2, logical frequency discriminator

30 3, divider 4 frequencies, pulse

a phase shifter 5, a reversible counter b, a control object 7, a frequency divider 8, a digital indicator 9, an oscillographic indicator.10 and a controlled frequency generator 11.

The measurement principle of the duration of the pulse under study consists in moving the image on the screen of the oscillographic indicator 10 by the required amount (for example, from the front to the falling edge and recording the duration on the digital indicator 9. The image is moved when the sweep phase changes relative to the starting pulse of the object 7 controls. the duration of the Investigated pulse, an additional phase change is made by thematically. Thematically by means of a pulsed phase shifter 5. For this purpose, Initially, the reference point (conditional zero of the head / head) is set to either TgTg O or Trg-Tao. If JT Ti is set to a pulsed phase shifter 5, the corresponding potential sign and pulses, the frequency of which is proportional to iT MilTal, are supplied to the higher bits of the counter. sweep starts to move discretely in the appropriate direction, which is simultaneously recorded by counter 6 and indicator 9. When the image approaches the desired place on the screen, the angle 7g decreases, and the speed of image movement decreases. At 7 O, the image is stopped and the remaining part of the pulse studied is brought to the desired place on the screen by the phase shifter.

Pulse phase shifter 5 operates by subtracting or adding counting pulses at the input of divider 8. Therefore, the step of discrete phase shift by phase shifter 5 is determined by the period of counting pulses. In accordance with this, the number of the highest decade of the counter b is determined;

excitation from a controlled frequency generator 11.

The introduction of a pulsed phase shifter and a controlled frequency geerator automates measurement operations, increasing operator productivity. In the experimental model, the discreteness of the digital reading along the circuit of the analog phase shifter is 10–10 s (prototype). In the invention, the reading along the circuit of the controlled frequency generator and the pulse phase shifter is 10–10 8 s.

Claims (2)

Invention Formula A time meter, containing a block of frequencies, the first output of which is through a logical frequency, a discriminator and reversible; The counter is connected to a digital indicator, the second output is connected via a serially connected frequency divider and the control object is connected to the first input of the oscillographic indicator to the second input of the logical frequency discriminator, the second input of the oscillographic indicator. connected to the output of the second frequency divider, distinguishing This is because, in order to improve speed, a pulse phase shifter, connected between an analog phase shifter and a second frequency divider, and a controllable frequency generator, the output of which is connected to the control input of the pulse phase shifter and to the high bits of the reversible counter, are inserted into the meter. Sources of information taken into account in the examination 1, Aitor's Certificate of the USSR 5 491924, cl. G 04 F 11/08, 1972. 2. Odinokoy V.F., Kremnev V.I. Time meter Lime universities. Instrument making, t. XVII, 8, L., 1974 (prototype).