SU945808A1 - Periodic electric signal voltage instantaneous value measuring method - Google Patents

Description

one

The invention relates to electrical measuring equipment and can be used to measure the instantaneous value of voltage in different parts of an electrical signal of complex shape.

There is a known method for measuring the instantaneous voltage in different parts of a periodic electric signal, based on generating control pulses, moving them along a periodic process curve displayed on an oscilloscope, summing the value of a control pulse with an instantaneous voltage of an electrical signal at the point being studied, limiting it and measuring it at peak pulse to voltmeter to.

The disadvantage of this method is that the signal under study passes through additional blocks, it is added, it is limited that the negative influence on the measurement accuracy. In addition, the oscillogram does not show the measured part of the curve, so its location on the curve can be judged only by setting the duration in the unit for setting the measurement moment.

The closest in technical essence to the invention is the method of measuring the instantaneous value

, d the voltage of a periodic electric signal, which consists in applying to the oscillogram of the signal being investigated marker points by local increase or decrease

5 picture brightness. The application of marker points is carried out with equal reference voltage with a variable sinusoidal voltage 2.

Claims (2)

20 The disadvantage of the known method is the low accuracy due to the fact that when measuring the voltage of a signal, there are even small pieces of steps that are not visible on the screen, i.e. when the oscillogram of the signal on the oscilloscope screen is displayed as straight lines, when applied to the image of marker points, they only indicate the fact that they do not allow us to judge the ratio of the voltages of the signal sections before and after comparison. The purpose of the invention is to improve the measurement accuracy. The goal is achieved by the method of measuring the instantaneous voltage value of a periodic electrical signal involving the use of a reference voltage, which means that the signal under study is fed to the input of the channel of the vertical deflection of the oscilloscope. the deviations of which are applied to a synchronous linearly varying voltage, compare the reference voltage with the voltage of the signal under study and at the time of equality from The oscilloscope waveform intensity is changed on the oscilloscope screen. FIG. 1 shows a block diagram of a device implementing the method; 2 - oscillogram of the signal under study on the oscilloscope screen. The device contains a comparison unit 1, an oscilloscope 2, a generator 3 of a linearly varying voltage, a source k of a reference voltage, a voltmeter 5, a control key 6, a generator 7 of an alternating voltage. The signal under study is fed to one of the inputs of the comparison unit 1 and to the input of the channel of the vertical deflection of the oscilloscope 2, to the input of the channel of the horizontal deflection of which the synchronized sweep voltage from the generator 3 is linearly varied with its voltage. On the oscilloscope screen 2, the signal under investigation is displayed in the form of an oscillogram. As long as the instantaneous voltage value of the signal under study is less than the voltage set by the voltmeter 5 at the output of the source C, the key 6 opens1 and the alternating voltage from the generator 7 is fed to the input of the beam control channel, increasing it. brightness At the instant of equality of the instantaneous value of the voltage of the signal under study with the source voltage t, the comparison unit 1 generates a signal that locks key 6. The alternating voltage from generator 7 does not flow to the input of the oscilloscope luminance channel 2, the beam brightness decreases and the waveform portion of the voltage (The higher voltage of the comparison is weaker. When the voltage under investigation decreases below the voltage of the source 4, the key 6 is again unlocked and the brightness of the beam increases. Thus, all portions of the signal under investigation the voltage is lower than the reference voltage, highlighted on the oscillogram, and higher, weaker. By changing the comparison voltage, instantaneous values of voltage can be measured on the entire curve of the voltage under investigation Formula of the invention A method of measuring the instantaneous value of a voltage of a periodic electric signal involving the use of a reference voltage voltage, which implies that the signal under study is fed to the input of the channel of the vertical deflection of the oscilloscope, to the input of the channel of the horizontal deflection of which is A synchronous linearly varying voltage is provided, characterized in that, in order to improve measurement accuracy, the reference voltage is compared with the voltage of the signal under study and, at the time of their equality, change the brightness of the oscillograph of the signal under investigation on the oscilloscope screen. Sources of information taken into account in the examination 1, USSR Copyright Certificate №150173, Clos G 01 R 19/00, 19b1. 2.Novolov N.N. Measuring equipment in wired communication. H. 2. M., Svy, 1969. with. 178-183 (prototype). F1g.1