SU1255941A1 - Horizontal deflection device of cathode-ray oscilloscope - Google Patents

Abstract

The invention relates to electronic measuring technology. The purpose of the invention is to increase the accuracy of measurement of signal time parameters and service efficiency. The device comprises a reference frequency generator 1, an adjustable frequency divider 2, a counter x 3 pulses, a code comparison unit 4, a synchronization unit 5, a backlight pulse generator 6, and a horizontal deflection amplifier 7. Introduction of the trigger 8, the generator 9, the saw-tooth voltage, and the adjustable setpoint generator 10 with the formation of new connections between the elements of the device eliminates the smoothing and uncertainty of the localization of the characteristic points of the signal on the scan and simplifies the change of operating modes in the output of the direct measurement result to a digital indicator. 1 hp f-ly, 1 ill.

Description

The invention relates to electronic measuring technology and can be used in electron beam oscilloscopes.

The aim of the invention is to improve the accuracy of measuring signal time parameters by eliminating the flattening and uncertainty of localizing the characteristic points of the signal on the scan and increasing the operability of the service by simplifying the change of operating modes and outputting the direct measurement result to a digital indicator.

The drawing shows a block diagram of the proposed device.

The device comprises a reference frequency generator 1, an adjustable frequency divider 2, a pulse counter 3, a KodoV comparison unit 4 synchronization unit 5, a backlight pulse generator 6, a horizontal deflection amplifier 7, a control trigger 8, a saw voltage generator 9, and an adjustable unit 10 codes.

At the same time, the output of synchronization unit 5 is connected to the installation input of the control trigger unit 8, the output of which is connected to the reset inputs of the adjustable frequency divider 2 and the pulse counter 3, the generator 9 input of the sawtooth voltage and the first input for the light pulse generator 6, the second input of which is connected with the output of block 4 comparison codes.

The output of the sawtooth generator is connected to the input of the horizontal deflection amplifier 7.

The outputs of the bits of the adjustable setting unit 10 codes are connected to the first code input of the code comparison unit 4, the second code input of which is connected to the outputs of the bits of the counter of 3 pulses, the output of the higher bit of the last one is connected to the counting input of the control trigger 8,

The reference frequency generator 1 can be performed as a pulse generator stabilized by a quartz resonator. As an adjustable setting device of 10 codes, you can use software rotary switches with digitization of the position H1-1Y or ycTpoficTBo, containing its source of the reference voltage, the output

559412

which through the controller is connected to the input of the analog-to-digital converter, the code outputs of the latter are connected to digital indicators,

5 indicates the result of the conversion, and is the output of the adjustable setpoint generator 10 of the codes.

The device works as follows.

10 In the initial state, the generator 1 of the reference frequency generates pulses with a frequency f, the control trigger 8 is in the zero state, the fault inputs of the adjustable divider 2 frequency and the counter 3 impulse B have a potential corresponding to a logical zero and the pulse is denied, the generator 9 sawtooth At the time of spinning, the voltage is kept in the initial state, a voltage is present at the output of the illumination pulse shaper 6, providing a quenching of the beam of the cathode ray tube,

35, the device is in a standby state.

Short sync pulse generated by sync block 5

 W W-trigger control 8 to one state. The logical unit from the output of the control trigger 8 enables the adjustable variable divider 2 frequencies and the 3 pulses counter to be enabled, allows the generator 9 to form a linearly increasing sawtooth voltage, and excites the backlight pulse 6, which is outputted by a light pulse .

The sawtooth voltage is amplified by a horizontal deflection amplifier 7 and, together with the light pulse, provides the formation of

 time scan.

Adjustable divider 2 frequency depending on the position of the regulator division factor, forms one pulse after counting each

 N pulses of the oscillator 1 of the reference frequency, where N is the division factor of the adjustable frequency divider specified by the regulator of the division factor. Pulses from the output of an adjustable divider 2 frequencies with often40

the one is counted by a counter of 3 pulses, the outputs of the bits are counted3

A pulse of 3 pulses appears code corresponding to the current time of the forward sweep stroke.

When the code from the output of the bits of the counter of 3 pulses becomes equal to the code at the output of the adjustable setpoint generator 10 codes set by the controller, block 4 of the code comparison will generate a marker pulse with a length of t - because

On-off-, at the outputs of the bits of the counter 3 pulses, the new code differs from the code at the output of the adjustable setting device 10 codes, as a result of which, at the output of the illuminator 6 forcing the illumination pulse, the illumination pulse appears in the illumination pulse equal to -Tf coinciding in time position with a pulse of a marker with a voltage level that provides an intensity of the electron beam that is different from the intensity at the rest of the forward time course of the sweep, and on the scanner a marker appears - a section with intensity, about from brightness left nyh parts sweep with length NL

by its value - by, by extension -, where

L is the sweep length, an is the conversion factor of the counter of 3 pulses, and the time position on the sweep corresponding to the code at the output of the adjustable setpoint generator 10 codes

Since the conversion factor p for a particular device is constant, the marker length for any sweep range at a constant sweep length is the same

After a time equal to

Nn

- relative to the time of occurrence of the clock pulse, counted by adjustable frequency divider 2 and counter 3 pulses, with an error within the period of the generator 1 reference frequency, resulting from the uncertainty of the timing of the clock pulse relative to the pulse sequence of the generator 1 reference frequency at the output of the higher discharge of the counter 3 pulses is the front corresponding to the overflow of the counter 3 imllul 559414

The control trigger trigger 8 is reset to zero at the counting input — the formation of the control pulse has ended.

5 A logical zero that occurred at the output of the control trigger 8 stops the counting of pulses by an adjustable frequency divider 2 and a counter of 3 pulses and keeps them at zero

10 state, completes the formation of the light pulse and stops the formation of a linearly increasing section, a sawtooth voltage generator 9, after which

15 forming a falling portion of the sawtooth.

For the duration of the control pulse from the output of the control trigger 8, the W-shaped voltage reaches the value:

u sf.

(one)

where S is the rate of increase of the voltage on the linearly increasing section, specified by the time defining the chains of the generator 9 ..: on the shape of the generator.

The regulation of the interconnected Nffl controllers of the frequency division factor and the sweep ratio when moving to a new sweep range gives new values of the frequency division factor N, and the voltage rise rate S. So that the length of the time sweep at the new position of the regulators does not change, where, Uj is the amplitude of the sawtooth voltage at the new position of the regulators, since the sweep length is proportional to the amplitude of the saw voltage.

Then, taking into account the formats (1), the condition for maintaining the sweep length is

SN S, N.

(2)

Upon reaching the saw-tooth voltage in the falling portion of the initial value, the device returns to the initial state.

In the process of measuring the time parameters of the signals, asking the output of the adjustable driver 10 codes necessary code corresponding to, for example, the number K, the marker is aligned with the characteristic point of the signal under study. Then the temporal position of the marker, and consequently, the characteristic point of the signal relative to the start of the sweep, will be determined by the formula:

Nk

(3)

moreover, the number K is calculated from the readout device of an adjustable timedN chic 10 codes, and is determined by

the digitized position of the interconnected regulator of the division factor of the frequency, and the coefficient of the sweep. The value of t is discrete and has a quantization step.

N

-p-, the quantization step being adjusted.

The number K so far: it shows how many time slices fit in the interval from the beginning of the sweep to the marker, therefore the left border of the marker must be combined with the characteristic point of the signal, as far as the discrete nature of the marker’s time position allows.

The time interval is calculated as the difference of the temporal positions of two characteristic points of the signal, determined by the interval and measured in accordance with formula (3).

Claims (2)

Invention Formula .one. A device for horizontal deflection of an electron-beam oscilloscope containing a reference frequency generator and serially connected adjustable divider Compiled by N. Mikhalev  L. Serdyukov and proofreader M: Maksimishinets Order 4817/44 Circulation 728 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5. Production and printing company, Uzhgorod, st. Project, 4 frequency, pulse counter, code comparison unit, as well as a synchronization unit, a sublime pulse shaper and a horizontal deflection amplifier, characterized in that, in order to improve the measurement accuracy of signal time parameters, a control trigger, a saw voltage generator and an adjustable code generator are entered into it the output of the synchronization unit is connected to the installation input of the control trigger unit, the output of which is connected to the reset inputs of the adjustable frequency divider and pulse counter, input g the sawtooth voltage generator and the first input of the illumination pulse generator, the second input of which is connected to the output of the code comparison unit, the output of the sawtooth voltage generator is connected to the input of the horizontal deflection amplifier, the outputs of the adjustable code setting unit are connected to the first code input of the code comparison unit, the second code input the input of which is connected to the outputs of the bits of the pulse counter, the output of the higher bit of the latter is connected to the counting input of the control trigger, and the output of the generator is reference constant frequency is connected to the counting input of the adjustable frequency divider. 2. A device according to claim 1, characterized in that the regulator of the division ratio of the adjustable frequency divider and the regulator of the sweep ratio of the sawtooth generator are mutually connected.