SU864146A1 - Oscillographic meter of electric signal time parameters - Google Patents

Description

f-54) OSCILLOGRAPHIC METER OF TIME PARAMETERS OF ELECTRICAL SIGNALS

The invention relates to electrical engineering and can be used in an oscilloscope with a digital measurement of electrical signal parameters. The osdillographic time interval meter is known, which contains a sweep generator, an amplitude comparator, the second input is connected to the source of the reference voltage and the first input of the A / D converter, connected to the output of the DAC, and the output converter to the inputs of the memory block and large-scale converter {. ij. The disadvantage of this device is the accuracy due to the nonlinearity of the sweep voltage and the unstable response of Kc "iapators. The closest to the invention in technical ESSENCE is an oscillographic time meter for electrical signals containing a vertical vertical amplifier, the first input of which is connected to the bus of the signal under study, and the output — With vertically deflecting plates of the cathode ray tube, whose horizontal deflection plates are connected The output of the sweep generator and the first inputs of the first AND second comparators, the second inputs associated with the first and second sources of adjustable reference voltage, and the time interval meter, pulse counter, digital-analog converter and the backlight unit 12}. A disadvantage of this device is the low accuracy of the time interval measurement, due to the fluctuation of its boundaries due to the instability of the operation of ksm paratores, especially at a low rate of measurement of the sawtooth voltage at the input to the parator. The purpose of the invention is to increase the accuracy. signals, which contains a differential amplifier of a seasonal optical deflection, the first input of which is connected to the ID of the signal under study, and the output is from a vert locally deflecting plates of a cathode ray tube, a horizontal deviation, PTH ptiny WHERE n which are connected guide plates are connected

To the output of the sweep generator and the first inputs of the first and second comparators, the second inputs connected to the first and second sources of the adjustable reference voltage, and the time interval meter are equipped with two triggers, two resistors, an adjustable delay unit, and a shock excitation generator, the output of which with the second inputs of the first and second triggers, and the input with the output of the first comparator and the first input of the first trigger, the output of which is connected to the first input of the time interval meter and n The first output of the first resistor, the second output of which is connected to the second input of the vertical deflection amplifier and the second output of the second resistor, the first output connected to the second input of the time interval meter and the output of the adjustable delay unit, whose input is connected to the output of the second trigger, the first input of the connected with the release of the second comparator.

The structural electrical circuit of the device is shown in the drawing. The device consists of a differential amplifier 1 vertical deviation, cathode ray tube 2, the first trigger 3, the first comparator 4, resistors 5 and 6, the meter 7 time intervals, the generator 8 of the shock excitation, the first source 9 of the adjustable reference voltage, block 10 adjustable delay, the second trigger 11, the second comparator 12, the second source 13 of the adjustable reference voltage and the generator 14 sweeps

The device works as follows.

The generator 14 forms a sawtooth sweep voltage, which is fed to the first inputs of the comparators 4 and 12. The second inputs are supplied by the comparator 4 and 12 with a voltage from the source 9 and 13 of the adjustable reference voltage. At the moment of equality of the sawtooth voltage of the sweep and the voltage of the source 9, the comparator 4 is triggered. The output signal of the comparator 4 starts the shock excitation generator 8 and unlocks the trigger 3. The shock excitation generator 8 generates a sequence of pulses with a period T, which is fed to the inputs of the trigger 3 and 11. The first pulse of this sequence triggers the trigger 3. At the moment when the saw-tooth voltage reaches the sweep, the voltage of the source 13 triggers the comparator. 12. The output signal of the comparator 12 releases the trigger 11

which is triggered by the arrival of the secondary impulse of the shock excitation generator 8. Since the triggering of the triggers 3 and 11 occurs at the moment of the pulse of the generator 8 of the shock excitation, the time interval between the triggering moments of the triggers 3 and 11 is equal to pT, where n 0,1,2, ... Changing the voltage value of the source 13 the interval between the trigger times of triggers 3 and 11.

The output signal of the trigger 11 is supplied to the adjustable delay unit 10, where it is held down by the value of .0 f T, so that the time interval in the relay of the period of the shock excitation generator 8 can be smoothly changed. The time interval between the signals at the trigger 3 outputs (Start ) and an adjustable delay unit 10 (Stop) is equal to pT + (/ and its stability is determined only by the stability of the shock booster generator 8 and the adjustable delay unit 10 and does not depend on the instability of the response comparators 4 and 12. The formed time interval is measured by a time interval meter 7. The Start and Stop pulses corresponding to the time interval boundaries are fed to the second input of the vertical-difference differential amplifier 1, in which KOTOR the Start signal and the Stop in As a result, on the screen of a CRT 2 an image of the measured signal and two marks are formed, which are set at selected points on the signal image by varying the values of the source voltage 9 th and 13 and the delay unit 10.

Claims (1)

1. USSR author's certificate No. 586562, cl. H 03 K 5/20, 1975, 2, USSR Author's Certificate. Under the application N 2700182 / 18-21, cl. G 01 R 13/30, 1979 (prototype)