SU1188659A1 - Cathode-ray oscillograph - Google Patents

Abstract

ELECTRON-BEAM OSCILLOGRAPH containing the vertical deflection unit, the input of which is connected to the bus of the signal under study, the first output - with the first input of the CRT, and the second output - with the input of the sync pulse generator, the output of which is connected to the input of the automatic selection module of the generator of the sweep generator and the second the control trigger input, the first input of which is connected to the output of the blocker, the third input to the output of the automatic selection unit of the sweep generator, and the first output - with the first input of the sawtooth generator, the second input of which is connected to the first output of the sweep switch, and the output to the second input of the cathode ray tube and the input of the comparator unit, the output of which is connected to the first input of the blocker, the second input connected to the second output of the switch scan torus, characterized in that, in order to reduce image distortions due to nonlinearity of the sweep on fast subbands, it is equipped with a switching logic unit and a pulse shaping unit, the output of which one with a third input of the bollard, a first input - to the third scanning switch output and the second input - to the output switching logic unit having a first input coupled to the fourth output komX) mutator sweep and the second input to the second output eo control trigger. Ed sl you

Description

The invention relates to electrical measuring technique and can be used in the design of an electron-beam oscillographs.

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The aim of the invention is to reduce image distortions due to the nonlinearity of the sweep on fast sub-bands,

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The drawing shows a structural electrical circuit device

The device consists of a vertical deflection unit 1, a synchro generator 2, an automatic generator generator mode selection block 3, a lock 4, a control trigger 5, a comparison unit 6, a sawtooth voltage generator 7, a sweep switch 8, a switching logic unit 9, a shaping unit 10 pulses and a cathode ray tube (CRT) 11, the input of the vertical deflection unit 1 is connected to the signal bus, the first output is connected to the first input of the CRT 11, and the second output is connected to the input of the driver 2 sync pulses D which is connected to the input of the automatic selection unit 3 of the sweep generator and the second input of the control trigger 5 whose first input is connected to the output of the blocker 4, the third input to the output of the automatic selection unit 3 of the scanning generator, and the first output to the first input of the generator 7 a sawtooth voltage, the second input of which is connected to the first output of the switch 8 sweep, and the output from the second input of the CRT 11 and the input of the comparison unit 6, the output of which is connected to the first input of the blocker 4, the second input ohm connected to the second output of the switch 8 sweep. The output of the pulse shaping unit 10 is connected to the third input of the blocker 4, the first input is connected to the third output of the sweep switch 8, and the second input is connected to the output 9 of the switching logic, the first input of which is connected to the fourth output of the switch 8 sweep, and the second input is connected to the second trigger switch. 5 controls

The device works as follows.

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The signal under study arrives at the input of the vertical deflection unit 1, is amplified, and from its first output enters the vertical 5 deflection plates ELT11. From the second output of the vertical deflection unit 1, the signal arrives at the input of the synchronizer 2, which converts the

0 arbitrary waveform in pulses of standard amplitude and duration. If there is an input signal, the automatic generator operation selection unit 3 keeps the control trigger 5 in standby mode, the clock pulses from the output of the imaging unit 2 receive the second control input trigger 5 ria and put it in the state where

Q begins the formation of a forward stroke of the sawtooth voltage.

The sawtooth voltage build-up rate is established by the switch 8. On the scan subbands with slow and average sawtooth voltage growth rates, the delay of signals in block 6, blocker 4 and trigger 5 is insignificant compared to the duration of the forward stroke of sawtooth voltage and distortion at the end of the saw There is no saw blade movement. On these subbands, the switching logic unit 9 does not include the pulse shaping unit 10. When the sawtooth reaches a certain level, the first block b of the comparison is triggered and starts the lock 4, which translates the control trigger 5 into a state in which the formation of the reverse stroke begins. During the formation of the reverse stroke of the saw-tooth voltage, the saw-voltage generator 7 is kept in its initial state.

5 lock 4 through the trigger 5 control. When the blocking time has elapsed, the control trigger 5 is put into sleep mode and is ready to start from the next sync pulse. With

In the absence of input signals, the self-oscillatory mode of operation of the sweep generator is provided by block 3 of automatic selection of the operating mode of the sweep generator. On

5 fast sweep subranges, where the duration of the forward stroke of the sawtooth voltage is comparable to the signal delay in block 6, blocker 4 and trigger 5, switching logic block 9, which is a high-speed logic element, for example, And element, if there are two allowing signals at its inputs The signals (one from the output of the control trigger 5, the second from the third output of the switch 8 sweep when the corresponding fast sweep subband is turned on) turns on the pulsing unit 10. This occurs at the time of triggering by the control 5 of the generator 7 of the saw-tooth voltage. The pulse shaping unit 10 is a series-connected stand-by multivibrator and a differentiating force. tel. The duration of the pulse generated by block 10 is determined by co-commutator 8 depending on the BKJDO specific subband sweep. This impulse, with its falling edge leading the impulse from the output of comparison unit 6, triggers block 4.

The pulse duration in the pulse shaping unit 10 on each fast sweep subband is chosen such that, taking into account the delay in the lock 4 and the control trigger 5, the sawtooth j is always broken at the same point. Since the pulse shaping unit 10

not connected directly to the sawtooth generator 7, it has no effect on the slope of the sawtooth voltage on the delay time of the signal in the lock 4 and the control trigger 5,

The blocker 4 puts the control trigger 5 into a state in which formation of the sawtooth voltage begins to reverse, for which time and for transient and recovery processes in the sweep generator blocker 4 keeps the control trigger 5 in a state in which it cannot start. syn. pulse. After the blocking time expires, control trigger 5

Q switches to standby mode and is ready to start from the next sync pulse. In the absence of an input signal, the unit 3 automatic selection of the operating mode of the generator

sweep sets the self-oscillating mode of operation.

The device eliminates the non-linearity of the saw-tooth voltage at its end, the change in the amplitude of the saw-tooth voltage and

its steepness in the transition from one fast subrange sweep to another, to increase the speed of the entire generator sweep.

Claims (1)

'' ELECTRON BEAM Oscilloscope containing a vertical deflection unit, the input of which is connected to the bus of the signal under study, the first output is with the first input of the cathode ray tube, and the second output is with the input of the sync pulse shaper, the output of which is connected to the input of the block for automatic operation of the scan generator and the second input of the control trigger, the first input of which is connected to the output of the blocker, the third input - with the output of the automatic selection unit of the scan generator operation mode, and the first output - with the first th input of the sawtooth generator, a second input coupled to the first output scan switch, and an output - to a second input of the cathode ray tube and the input of the comparator, whose output is connected to the first input blocker, a second input Cpd nennogo a second output commutator · "; sweep torus, characterized in that, in order to reduce image distortion due to non-linearity of sweep on the `` fast '' ¹ subbands, it is equipped with a switching logic unit and a pulse shaping unit, the output of which is connected to the third input of the blocker, the first input to the third the output of the switcher switch, and the second input with the output of the switching logic block ”, the first input of which is connected to the fourth output of the switcher switch, and the second input with the second output of the control trigger. 1 1,188,659 2