SU436980A1 - Overlay Inspector - Google Patents

Description

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The invention relates to the field of measurement technology, in particular, to devices for inspecting overlays of electrical signals.

Inspectors of overlays on the useful part of the inspected signals are known, which contain a fast signal driver, a scheme for extracting the useful part of the inspected signals, and a key. In addition, there are known inspectors of overlays on the useful part and falloff simultaneously, which contain a fast signal driver, a charge-discharge device, a level discriminator, and a key.

However, the inspection time interval generated by known inspectors is either fixed in duration or dependent on the amplitude of the inspected signals. This leads to the fact that when the formation time of the inspected signals changes, the inspection time should be set to a maximum, which increases the dead time at a shorter formation time, or the overlay inspector should be introduced. Increasing the dead time is undesirable, and changing the parameters of the overlay inspector is inconvenient.

The aim of the invention is to provide an automatic operation of the overlay inspector when changing the permanent time of the inspected signals.

In the proposed inspector, the linear dependence of the inspection time interval on the useful part and the decrease depending on the constant time of formation of the inspected signals during the separate generation of logical impulses "Overlay on the useful part and" Overlay on

recession.

The drawing shows a block diagram of the proposed inspector.

The inspector contains a circuit 1 for extracting the useful part of the signals, sequentially

connected charge-discharge device 2, storage device 3 and level 4 discriminator, fast signal generator 5, controlling keys 6 and 7, the first of which is connected to the extraction circuit of the useful part

signals. Additional elements are the time-amplitude converter 8 and the anti-coincidence circuit 9, with the time amplitude converter 8 being connected between the output of the allocation circuit useful

parts of the signal and the input of the charge-discharge device 2, the inputs of the anti-attachment circuit 9 are connected to the outputs of the extraction circuit of the useful part of the signal and the level 4 discriminator, and the output of the anti-coincidence circuit 9

served on the signal input of the second key 7. The overlays inspector works as follows. When the input of the extraction circuit of the useful part of the signals arrives, an interval of time is formed at its output proportional to the duration of the useful part. If during this time interval, pulses appear in the output of the fast signal generator, they pass through key 6, being the logical signal Overlay on the useful part. At the same time, by using the time-amplitude converter 8, the time interval from the output of the extraction circuit of the useful part is transformed into a voltage amplitude proportional to it. The charge device 2, together with the drive 3 and the discriminator 4, invert the voltage amplitude into a time interval. With the anti-coincidence circuit 9, the time interval of the inspection for decay arriving at the control input of key 7 is separated. If during this time interval the output of the fast signal generator 5 is pulsed, then they pass through the key 7, is a logical signal “Imposition of a decline. The time interval of a drop inspection is the difference between the time intervals produced by the extraction of the useful part of the signal and the discriminator of level 4. The choice of the conversion factors for the time-amplitude converter 8 and the charge-discharge device 2 determines the initial ratio between the time intervals of the inspection for useful part and decline. It follows from the principle of the overlay inspector that if the permanent times for the formation of the inspected signals are changed, the inspection time intervals will change in proportion. Once established, the ratio of 1 1 set between them will always be constant. The subject of the invention is the overlap inspector containing the allocation of the useful part of the signals, subsequently connected to the charge-discharge device, the accumulator and the discriminator of the level, the fast signal generator, which controls two keys, the first of which is connected to the selection of the useful part of the signals, characterized in that , in order to ensure automatic operation when changing the constant times of the formation of the inspected signals and the separate formation of logical signals "Overlay on the useful part and drop-down, a time-amplitude converter and an anti-coincidence circuit are entered into it, the time-amplitude converter is connected between the output of the extraction circuit of the useful part of the signal and the input of a charge-discharge device, the inputs of the anti-coincidence circuit are connected to the outputs of the extraction circuit of the useful part of the signal and discriminator level, and the output of the anti-coincidence circuit is fed to the signal input of the second key.