SU951147A1 - Digital measuring oscilloscopic device - Google Patents

Description

The invention relates to electrical measuring technology and can be used to build oscilloscopes with broad functionality.

The closest to the invention to the technical essence is a digital measuring oscillographic device., Comprising a cathode tube, vertically and horizontally deflecting plates of which are connected to the outputs of vertical and horizontal deflection amplifiers, the inputs connected to the outputs of the first block of switches 1 whose first input is connected to the output : the synchronization and voltage sweep unit, and the second input - with the input of the synchronization unit and the voltage sweep and output voltage House buffer amplifier vhrdom connected to the test signal bus and the second fixed contact. the first board of the switch of the type of work, the third fixed contact of the first board of which is connected to the output of the unit for converting the measured values to a constant voltage, the movable contact of the first

boards - to the input of a dc converter into a proportional number of pulses, first and second fixed contacts of the second board - to the first and second outputs of the driver for control signals, and the output of the constant-voltage converter into a proportional number of pulses is connected to the input

10 pulse counter, the output of which is connected to the input of the forming and display unit of digits, the converter of the instantaneous value of the signal under study into a constant voltage, connected to the bus of the signal under investigation AND

A disadvantage of this device is the limited range of metrological characteristics. The device is characterized by a narrow frequency range and does not provide a digital measurement of 1 time intervals with smooth adjustments of the sweep speed with time-keeping of the headquarters. ..

The purpose of the invention is to expand the range of metrological characteristics by increasing the frequency range and providing a digital measurement of time intervals while continuously adjusting the scanning speed while maintaining the time scale. The circuit is achieved by virtue of the fact that a digital measurement oscillographic device containing a cathode tube, vertically and horizontally deflecting plates of which are connected to the outputs of the vertical and horizontal deflectors, the inputs connected to the outputs of the first switch unit, the first input of which is connected to the output of the synchronization unit and the voltage sweep, and the second input - with the input of the synchronization unit and the sweep voltage and the output of the buffer amplifier, the house of the test signal connected to the busbar and the second fixed contact of the first board of a switch of the type of work, the third fixed contact of the first board of which is connected to the output of the unit for converting measured values to direct voltage, the movable contact of the first board to the input of the constant voltage converter to proportional the number of pulses, the first and second fixed contacts of the second board to the first and second output of the control signal generator, and the output of the constant voltage converter The proportional number of pulses is connected to the input of the pulse counter, the output of which is connected to the input of the forma- tion and indication of digits unit — equipped with a second switch unit, a driver of two markers, a voltage difference separator, a voltage multiplier, two control units the marker maker and the smooth sweep speed control unit, the breathing device connected to the second input of the synchronization and sweep voltage unit and the first input of the voltage multiplier, the output cat The first is connected with the fourth fixed contact of the first board of the switch of the type of operation, and the second input is connected with the first fixed contact of the first board of the switch of the kind of work and the output of the voltage difference separator, the inputs of which are connected to the outputs of the control blocks of the marker former and the formers of the marker former, output connected to the input of the second switch unit, the control input of which is connected with the moving contact of the second board of the switch of the type of operation, and the output with the third input of the first switch unit . The drawing shows the structural electrical circuit of the device. The device consists of a buffer amplifier 1, the first switch block 2, the synchronization block 3 and the sweep voltage generation, the smooth sweep speed control unit 4, the vertical deflection amplifier 5, the electron-beam tube (CRT ) 6, a horizontal deflection amplifier 7, a second switch block 8, two markers of driver 9, a unit 10 converting measured values to a constant voltage, a work type switch 11, block 12 is highlighted voltage difference, multiplier 13, the voltages of the transducer 14, a DC voltage into a proportional number of pulses, COUNT: ika 15 pulses, the block 16 forming and display digits, the first and second units 17 and 18 control the shaper markers and shaper 19 control signals. The device works as follows. The signal under study arrives at the buffer amplifier 1 output. From the output, and amplifier 1, the signal under study is fed to the input of the synchronization and sweep voltage unit 3, through the first switch unit 2 and the amplifier 5 to the deflection plates of the CRT. In the first mode of operation, the amplitude parameters of a variable periodic signal of an arbitrary foretle are measured. In this mode, the switch 11 is set to the first position. In this case, the output of the voltage difference allocator 12 is connected to the input of the converter 14, and the output of the control signal shaper is connected to the control input of the second flea 8 switches. In the control blocks 17 and 18 of the marker marker, the constant voltages are set, the values of which are proportional to the position of the points on the image of the signal under study. These voltages are applied to the inputs of the driver 9 markers, where they are converted by alternately switching to a pulse signal (square wave). From the output of the imaging unit 9 markers arrive at the input of the second block 18 of switches. The second switch block 8 includes switches via vertical and horizontal CRT channels b. When measuring voltages. second block 8 of switches. supplies a square wave that determines the position of the markers, only, to the channel of vertical deflection of the CRT b. From the output of the former 19, two voltages are applied to the control input of the second switch unit 8, which allow the second switch unit 8 to be switched, which ensures alternate supply of the markers and the signal under investigation to playback. On the screen

The CRT b reproduces the signal under study and two markers, two illuminated dots) in the test region of the signal. The change in the observed visual position of the markers is made by changing the amplitude of the square wave generated by block 9, and is done by changing the values of the constant voltages of blocks 17 and 18. The vertical distance between the markers is proportional to the difference of these voltages, which is allocated by block 12 and through switch 11 is fed to the input of the converter 14, the output pulses of which are counted by the counter 15. The code from the output of the counter 15 is fed to the input of the unit 16 for forming and imitating the numbers, on the indicator of which is displayed Digital value of the measured signal area.

In the second mode of operation, the voltage measurement of the direct current or the values converted to the direct voltage is measured. In this mode, the switch 11 is set to the second position when measuring DC voltage or to the third position when measuring values that convert 10 V to the unit, DC voltage. In the third mode of operation, measurement of time intervals is performed. In this mode, the switch 11 is set to the fourth position, in which the output of the voltage multiplier 13 is connected to the input of the converter 14. In the fourth position of the switch 11, the control input of the second switch block 8 is connected to the second output of the control signal generator 19, resulting in the second block 8 switches sends a square wave that determines the position of the markers to the channel of horizontal deflection of the CRT 6. At the same time, on the screen of the CRT 6, the signal under study and two markers, located in the horizontal the plane of the deployed signal.

To obtain the same sweep time scale and the distance between the markers, the difference in DC voltage is extracted in block 12, multiplied in block 13 by the output voltage of block 4 proportional to the rate of increase of the sawtooth voltage.

The output voltage of the voltage multiplier is 13, corresponding to the distance between the markers, i.e. the measured time interval, is fed to the input of the converter 14, and the digital value of the measured time interval is highlighted on the digital indicator of the block 16.

The device allows to expand the range of metrological characteristics by increasing the frequency range and providing digital and time intervals while smoothly adjusting the sweep while maintaining the time scale.

Claims (1)

Invention Formula A digital measurement oscillographic device containing a cathode tube, vertically and horizontally deflecting plates of which are connected to the outputs of vertical and horizontal deflection amplifiers, the inputs connected to the outputs of the first switch unit, the first input of which is connected to the output of the synchronization unit and the formation of a sweep voltage, and the second input - with the input of the synchronization unit and the formation of the voltage sweep and the output of the buffer amplifier, the input connected to the bus of the explorer Signal and in-motion fixed contact of the first board of the switch of the type of work, the third fixed contact of the first board of which is connected to the output of the unit for converting the measured webs to direct voltage, the movable contact of the first board to the input of the constant voltage converter. proportional to the number of pulses, the first and second fixed contacts of the second board to the first and second outputs of the control signal generator, the output of the dc converter in proportional quantities pulses are connected to the input of a pulse counter, the output of which is connected to the input of the forming and display unit, characterized in that, in order to expand the range of metrological characteristics by increasing the frequency range and providing digital measurement of time intervals while continuously adjusting the sweep speed while maintaining the time scale, it is equipped with a second switch block, a shaper of two markers, a voltage difference selection block, a voltage multiplier, two control blocks a marker maker and a smooth sweep speed control unit with an output connected to the second input of the sync and sweep voltage generating unit and the first input of the voltage multiplier, the output of which is connected to the fourth non-moving contact of the first switch of the type of work switch, and the SECOND input to the first fixed contact the first board of the switch of the type of work and the output of the voltage difference allocator, the inputs of which are connected to the outputs of the control blocks of the marker former and the inputs of a marker to the input of the second switch to the input of the second block of switches, the control input of which is connected with the movable contact of the second board of the switch of the work type and the output to the third input of the first block of the switches. / Information sources taken into account in the examination 1. Copyright certificate USSR 788005, C. 01 R 13/20, 1978 (prototype).