SU1136207A1 - Device for generating scale on crt screen - Google Patents

Abstract

DEVELOPMENT OF SHALTERS ON SCREEN ELECTRONIC BETWEEN HOUSE which is connected to the second output of the counter, and the outputs are connected to the control inputs of the switch, the first information input of which is connected to the output of the digital-analogue terminal the former, the second information input is connected to the outputs of the sawtooth generator, the input of which is connected to the output of the clock generator. 9

Description

F

FIG.

The invention relates to radio electronics and can be used in electrical metering technology, as well as in display devices.

A device is known that the formation of a scale on a CRT screen, containing a generator, the first commutator, is given. the first counter, the second one, the third one, with the conversion factor K 36, the decoder, the second switchboard, the first one, and the second TsLP 1,

The disadvantages of this device are the low speed and complexity of the device.

The closest in technical essence to the present invention is a device comprising a generator, a nerve, a second and a third counters, a first and a second D / A converter, a fourth, a switch and a register. 2

The disadvantages of the known device are the low speed and complexity of the device. The goal of the invention is to increase the speed and simplify the device.

The goal is achieved by the fact that a device for generating pulsations on the screen of a cathode ray tube containing a switch and series-connected clock generator, a counter and a digital-analog converter, a generator of artificial nanometer and a driver for their signals, whose input coe.n. isHeH with the second counter output, and b; with the control inputs of the switch, the first information input of which is connected to the output of a digital-to-analog converter, the information input is connected to the output of the sawtooth generator, the input of which is connected to the output of the generator of pulses.

FIG. 1 shows a functional diagram of a pre; Agoe device; in fig. 2 time diagrams of his work ..

The device contains a clock pulse generator 1, a counter 2, a digital-to-analog converter (D / A converter) 3, a sawtooth voltage generator 4, a driver of 5 control signals and a switch 6.

The formation of the scale is based on the imposition of separately formed horizontal and vertical lines.

. The clock pulses (Fig. 2a) of the generator 1 are tuned to 2, which controls the operation of the DAC 3, at the output of which a stepwise sawtooth voltage is formed (Fig. 2c) fed to the input of the switch 6, to the second input of which

It starts with a niloobraznoy voltage (Fig. 2b) from generator 4, triggered by pulses from clock generator 1. Pulses from the last digit of counter 2 are sent to start the driver 5 of controlled signals. The former, which is a combination of a counter with a conversion factor and a decoder into three outputs; produces a signal (fig. 2d), equal in duration to the cycle of operation of counter 2 and arriving at the first control input of switch 6. As a result, the output X of the switch has a sawtooth pulse sequence (fig. 2g) and at the output Y - a step-like voltage living (Fig. 2h), which together form horizontal lines.

The next time point from the second output of the imaging unit 5 to the second input of the switch 6, the second 5 equal signal arrives (Fig. 2e), as a result, the output of the switchboard X contains a step-shaped sawtooth signal (Fig. 2g) and T-sequence at the output sawtooth-shaped impulses. On the CRT screen, vertical lines are formed.

Next, a signal appears at the third output of the imaging unit 5 and enters the third input of the switch 6 (Fig. 2e). In this case, the X and Y outputs contain signals that come from the additional inputs of the switch 6, and on the CRT screen an image is formed corresponding to these signals, the parameters of which are selected using the buttons.

The number of formed tick marks is determined by the digit of counter 2. With the number of tick bits equal to three, the device forms eight vertical and eight horizontal tick marks.

The scale formation time is determined by the frequency of the oscillator 1 and is limited only by the speed of the DAC. With a generator frequency of 1 kHz, the formation time of the slides of eight vertical and eight horizontal divisions is 16 ms, which is about 10 times more than in a known device.

The use of a sawtooth voltage generator in the proposed device allows the use of only one DAC and one counter, whereas in the known one two DACs and four counters are used. This feature greatly simplifies the device, increases its reliability and speed.

Thus, the proposed device allows the formation of a scale with a value of J11362074

but smaller hardware costs than the large-scale grid screen of the proposed well-known device allows to improve the accuracy of measurement, as compared with the basic object of sions, since the drift zero of the amplifiers of the nationally produced domestic industry and the electronic scale of the CRT with the mechanically applied are named, as well as simplify the formation of the scale.

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Claims (1)

DEVICE FOR FORMING JKALA ON THE ELECTRON BEAM TUBE SCREEN, containing a switch and a series-connected clock generator, a counter and a digital-to-analog converter, characterized in that, in order to increase the speed of the device, it contains a sawtooth voltage generator and a control signal generator, the input of which connected to the second output of the counter, and the outputs connected to the control inputs of the switch, the first information input of which is connected to the output of the digital-analog conversion zovatelya, a second data input connected to the output of the sawtooth generator having an input coupled to an output of the clock. ί