SU1167540A1 - Device for displaying and measuring rise time of magnetic flux of deflecting system - Google Patents

Abstract

DEVICE FOR DISPLAYING AND MEASURING. DURATION OF INSTALLATION OF A MAGNETIC FLOW OF AN EXPOSURE SYSTEM, containing a counter, time stamper, electronic. a ray tube, a deflecting system, a series-connected voltage generator and a horizontal deflection amplifier, a vertical deflection amplifier, a resistor, an OR element, a first and second comparators and a generator, the output of which is connected to the counter inputs, a time stamp generator, and the first input of the sawtooth generator; two inputs of horizontal deflection coils of the deflecting system are connected to the output of the horizontal deflection amplifier; a horizontal resistor connected in parallel but with the inputs of the first and second comparators, the outputs of which are connected to the two inputs of the OR element, two inputs of the vertical deflection coils of the deflecting system are connected to the output of the vertical deflection amplifier, characterized in that, in order to improve the display and measurement accuracy, the first, second and third keys, pulse shaper, trigger and delay line, the control inputs of the first, second and third keys are connected to the first, second and third outputs of the counter, respectively, the element output and OR through a serial (First connected key and pulse shaper connected to the second input of the sawtooth generator, the output of the time stamper is connected via a second switch to the modulating input of the CRT, the first and second O: the trigger inputs are connected respectively to the outputs of the first and the second comparators, and the trigger output through 4 serially connected third key and the delay line are connected to the vertical deflection amplifier.

Description

The invention relates to radio. measuring technique and can be used to observe the processes of establishing the magnetic flux of the magnetic deflecting systems (OS) of the electron-beam tubes (CRT). A device is known for displaying and observing processes for establishing the magnetic flux of an operating system comprising a master oscillator, two inverters, an eight-bit counter, a logic circuit, four deviation amplifiers, an operating system and a CRT, the output of the master oscillator being connected via two inverters to two inputs of an eight-bit counter, the output of the first bit of which is connected to the modulating input of a CRT, the outputs of the last three bits are connected to the corresponding inputs of the logic circuit, while the OS coils through the corresponding amplifiers are deflection connected to the three outputs of the logic circuit and the output of the last bit of the eight-bit counter fl J, The disadvantage of this device is the error in determining the duration of the establishment of the magnetic flux due to its own geometric and nonlinear distortions of the OS, which appear in violation of the real figure electrically generated on a CRT screen, and an ideal square as a reference pattern, with which the real image should coincide in the absence of OS own distortions and transition th process of establishing a magnetic flux. It is also known a device containing a series-connected frequency generator (master oscillator) counter, a first digital-to-analog converter whose output is connected to the first input of the first comparator, a serially connected control unit, a beam deflection unit, a CRT, whose modulating input is connected to the element OR output via a video amplifier , two inputs of which are connected to the outputs of two comparators, as well as a second digital-to-analog converter, the input of which is connected to the output of the control unit, and output connected via a switch with the first input of the second comparator, the second inputs of the comparators are combined and connected via a voltage driver to the output of the C27 beam deflection unit. A disadvantage of the known device is the presence of an error in determining the duration of the establishment of the magnetic flux due to its own geometric and nonlinear distortions of the tested OC. The purpose of the invention is to increase the accuracy of the display and measurement of the duration of the establishment of the magnetic flux of deflecting systems. The goal is achieved in that the device containing a counter, a time marker generator, an electron-beam tube, a deflection system, are connected in series to a sawtooth generator and a deflection amplifier. horizontals, vertical deviation amplifier, resistor, element OR, first and second comparators and master oscillator, the output of which is connected to the counter inputs, form The world time stamp and the first input of the sawtooth generator, two inputs of horizontal deflection coils of the deflecting system are connected to the output of the horizontal deflection amplifier through a resistor connected in parallel with. the inputs of the first and second comparators, the outputs of which are connected to two inputs OR, two inputs of the vertical deflection coils of the deflecting system are connected to the output of the vertical deflection amplifier, the first, second and third keys, pulse shaper, trigger and delay line are entered; than the control inputs of the first, second and third keys are connected respectively to the first, second and third outputs of the counter, the output of the OR element is connected through the first key and the pulse shaper connected to the second input of the sawtooth generator, the second key is connected to the second input of the sawtooth generator modulating the entrance of the cathode-ray tube, the first and second inputs of the trigger are connected respectively to the outputs of the first and second comparators, and the output of the trigger through sequentially with a common third key and delay line are connected to the vertical deflection amplifier.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 - diagrams for his work; in fig. 3- - image on a CRT screen. .

The device contains a counter 1, a time stamper 2, a CRT 3 deflection system 4, a sawtooth voltage generator 5, a horizontal deflection amplifier 6, a vertical deflection amplifier 7, a resistor 8, an OR element 9, the first 10 and the second 11 comparators defining the generator 12, the first 13, the second 14 and the third 15 keys, the driver of the 16 pulses, the trigger 17 and the delay line 18. The output of the master oscillator 12 is connected to the inputs of the counter 1, the driver 2 time stamps and the first input of the generator 5 sawtooth voltage, two inputs of horizontal deflection coils OS 4

connected to the output of the amplifier b horizontal deviation through a resistor 8, connected in parallel with the inputs of the first 10 and second 11 comparators, the outputs of which are connected to two inputs of the element OR 9. Two inputs of the vertical deflection coils OS 4 are connected to the vertical voltage of the amplifier 7. The control inputs of the first 13, second 14, and third 15 keys are respectively connected to the first, second, and third outputs of the counter 1. The output of the OR 9 element is connected through the first key 13 and the driver 16 of the pulses connected to the second input of the sawtooth generator 5, serially connected connected to the input of the amplifier 6 horizontal deviation. The output of the driver 2 time stamps through the second key 1.4 is connected to the modulating input of the ELG 3. The first and second inputs of the trigger 17 are connected respectively to the outputs of the first 10 and second 11 comparators, and the output of the trigger 17 through the serially connected third key 15 and the 1 8 line of delay amplifier 7 vertical deflection.

Plot 19 shows the voltage pulse shape at the output of master oscillator 12; plot 20 shows the voltage form at the output of the sawtooth voltage generator 5 and is identical to that of the current at the output of amplifier 6

horizontal deviations; plot 21 — voltage pulses at the output of the driver 16 pulses; On plot 22, the output voltage, trigger 17; on plot 23, the voltage at the input of the amplifier 7 vertical deflection; plot 24 - the position of the counter 1; Figure 25 shows the status of keys 13–15.

The device works as follows.

At time t, the master oscillator 12 generates a pulse (plot 19), and counter 1 is set to position 1 (plot 24). In this case, the second key 14 is closed, i.e. is in the non-conducting state, and the first 13 and third 15 keys are open, i.e. ;; . are in a conducting state (plot 25). At the output of the sawtooth voltage generator 5, a sawtooth voltage appears, and in the horizontal deflection coils the OS 4 has the same shape (plot 20). On the screen of a CRT 3, the beam passes (draws) a segment of the line ab (Fig. 3). At time t, the first comparator 10 is triggered; from the output of which the voltage drop is fed to the input of the trigger 17 and through the element ITI 9

and open the first key 13 to the input of the imaging unit 16 pulses. The pulse shaper 16 generates a pulse (plot 21, time interval t ,, -t) arriving at the second (blocking) input of the saw-tooth generator 5, and for the duration of this pulse the growth of the saw-tooth voltage stops forming a horizontal platform on the saw-tooth voltage and , respectively, the current in the horizontal deflection coils of OS 4 (plot 20, time interval). At the output of the trigger 17, at the moment tj, a high voltage level (plot 22) arrives through the open third key 15 and the delay delay line 18 of the amplifier 7 for the vertical deviation at time tj (plot 23, time interval — line delay time 18 delays). In this case, the output of the amplifier 7 is the vertical deviation, i.e. in the circuit of the coil of the vertical deviation of OS 4, a current differential appears. Since at this time the magnitude of the current in the coils of the deviation of the horizontal does not change (horizontal platform on plot 20), a line segment bv is formed on the screen of the CRT 3 (Fig. 3). At time t, the action of the pulse of the pulse shaper 16 is completed (plot 21) and at the output of the sawtooth voltage generator 5, the further rise of the sawtooth voltage (plot 20) resumes. On the screen of the CRT 3, a line segment is formed (Fig. 3). At time tj, the magnitude of the current in the horizontal deflection coil of the OS 4 and, accordingly, the voltage drop across the resistor 8 reaches the second comparator 11 triggering voltage. the output of the second comparator 11 again triggers the pulse shaper 16 (plot 21 and on the output signal of the saw-tooth generator 5 a second horizontal platform is formed (plot 20, time t, .- t) The same difference from the output of the second comparator 11 post It goes to the second input of the trigger 17, a low voltage level is established at the output of the chortor (plot 22), This signal at the time t arrives at the input of the vertical deviation amplifier 7. In a CKT mode on the CRT screen 3 is formed with a line segment de (FIG. 3) At the end of the action of the pulse of the pulse shaper 16 (the moment of time t, the rise of voltage at the output of the sawtooth generator 5 is renewed, and a line segment ect is formed on the screen of the CRT 3. At time t, the rise of the sawtooth voltage ends (plot 20) and then the reverse sweep horizontally forms (plot 20, time interval) At time tg, the master oscillator 12 generates the next start pulse, the counter. 1 is set to position 2, with In this case, the first key 13 is closed, excluding the fact that the triggering of the pulse shaper 16, and the 5-sawtooth voltage generator produces a sawtooth pulse (plot 20, time interval tg-t). For the time interval tj-t on the EL screen 3, a line segment ab is formed (Fig. 3). At time C, the first comparator 10 is triggered and a high voltage level appears at the output of trigger 17 (plot 22). Accordingly, at time C, this voltage is fed to the input of amplifier 7 Since the CRT beam 3 also sweeps horizontally with a sawtooth current, a line bg is formed on the screen of the CRT 3 (Fig. 3), the shape and duration of which is determined by the transient characteristic of the magnetic flux OS 4. At time t Sravatsha second to the parator 11, a low voltage level is set at the output of the trigger 17, and at the time t there is a corresponding current surge in the vertical deflection coils of the OS 4. At the same time, on the screen of the CRT 3 a segment J is formed (FIG. 3) magnetic flux in the OS 4. For the period of time t -t, a line segment is formed. At the moment of time, the next pulse of the master oscillator 12 sets the counter 1 to the position 3, while all three keys 13-15 are closed. As a result, the pulse shaper 16 does not trigger, and the signal from the output of the trigger 17 does not arrive at the input of the amplifier 7 in the vertical deviation. The sawtooth generator 5 generates a sawtooth waveform (plot 20), and a horizontal line is formed on the screen of the CRT 3 (a null line) (Fig. 3). At time t, the next pulse of the master oscillator 12 sets the counter 1 to the position 1 and the operation of the device is subsequently repeated. Thus, over a period of time, a reference image of an abwdez is formed on the screen of a CRT 3; There is no effect of the process of establishing the magnetic flux of the OC, since at the moments of rise and fall of the current in the coil. In the vertical deviations, the magnitude of the current in the coils of horizontal deflection does not change (the horizontal areas on the plot 20, the time intervals tj-t and the duration of the specified time intervals are chosen so that during this time both the current in the vertical deflection coils, and the magnetic flux of the operating system managed to reach a steady-state value. The presence of a delay line 18 (with a delay time) eliminates distortion of the reference image as a result of possible transients in the horizontal deflection coils during the transition current from a linearly growing to a steady-state value. Over a period of time, an image of the healing process is generated (abgs; see figure 3) which represents the process of establishing the magnetic flux of the OC. Over a period of time, the image of the zero line is formed. In this case, since the formation of all three images preserves the geometric distortions of the CRT and OS,. Other factors, the processes of establishing the magnetic flux are completely determined by the shape of the figures bug 1 8 0 dezh and can be determined and dezh and can be determined with high accuracy. The time stamper 2 may either abate a series of time stamps (pulses) with a calibrated repetition period, or two floating marks that can be combined by the operator's actions with any points of the transient image to measure the time ratio. The second key 14 is opened only when the counter 2 is in state, and thus the time stamps are highlighted only in the image of the magnetic flux transient (not shown). When using the proposed device, the accuracy of measurements of the duration of the establishment of the magnetic flux of the operating system is increased, errors due to geometrical and nonlinear distortions of the image created by the investigated operating system and CRT, which are not ultimately connected with the establishment of the magnetic flux, are eliminated.

one

 | "

AND

a 5

e f 3

Fi: .3

Claims (1)

DEVICE FOR DISPLAYING AND MEASURING - DURATION OF ESTABLISHING A MAGNETIC FLOW OF A DECLINING SYSTEM, comprising a counter, a time stamp generator, a cathode ray tube, a deflecting system, a sawtooth voltage generator and a horizontal deflection amplifier, a first vertical deflection resistor, a second vertical resistor, an resistor, an resistor comparators and a master oscillator, the output of which is connected to the inputs of the counter, the time stamp former and the first input of the sawtooth voltage generator, two inputs of the horizontal deflection coils of the deflecting system are connected to the output of the horizontal deflection amplifier through a resistor connected in parallel with the inputs of the first and second comparators, the outputs of which are connected to two inputs of the OR element, two inputs of the vertical deflection coils of the deflecting system are connected to vertical deviation amplifier output, characterized in that, in order to increase the accuracy of the display and measurement, the first, second and third keys, pulse shaper, trigger and rear line are introduced into it LCD, and the control inputs of the first, second and third keys are connected respectively to the first, second and third outputs of the counter, the output of the OR element is connected through the first key and the pulse shaper to the second input of the sawtooth voltage generator, the output of the time stamp driver through the second key is connected to the modulating input of the cathode ray tube, the first and second inputs of the trigger are connected respectively to the outputs of the first and second comparators, and the output of the trigger through the sequence The newly connected third key and delay line are connected to the vertical deflection amplifier. SU., „1167540