SU441535A1 - Device for calibration and calibration of voltmeters of pulse-modulated oscillations - Google Patents

Description

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The invention relates to the field of electrical measurements, in particular, to exemplary apparatus for checking and calibrating voltmeters and transducers of pulse-modulated oscillations.

 The known device for checking and calibrating voltmeters of pulse-modulated oscillations contains an exemplary voltmeter and a tunable voltmeter connected to a transmission line loaded onto a matched load.

The calibration error in such a device is determined mainly by the accuracy of the reference voltmeter, which can be achieved with a minimum value of the measured voltage of 5-10 and depends on the duty cycle W of the measured signal.

The aim of the invention is to improve the accuracy of calibration and calibration of voltmeters of pulse modulated oscillations.

This is achieved by the fact that instead of a standard voltmeter of pulse-modulated oscillations, the device is equipped with a voltmeter of continuous sinusoidal oscillations and a pulse converter made, for example, on semiconductor diodes, while the input of the voltmeter is sinusoidal

the oscillations and one of the inputs of the impulse converter are connected to the cross section of the transmission line to which the turned voltmeter is connected; second entrance

pulse converter under-. It is connected to one of the outputs of a DC source and a generator of driving pulses; third input pulse converter

connected to the second output of a DC source and a control pulse generator; the output of the pulse converter is connected to the input of a null indicator with a compensator. J The drawing shows the flowchart of the device. It contains a tunable voltmeter I of pulsed modulated oscillations,

connecting element 2, load, ku 3, exemplary voltmeter 4 sinusoidal oscillations, a pulse converter 5, a source 6 of direct current, a generator 7 of control pulses, a zero-indicator 8 with a compensator.

The device works as follows.

A pulse-modulated oscillation from the measuring generator synchronized from the control generator and the pulses 7 is fed to the input of the device, and the reference indicator of the turned voltmeter I is set to a detectable mark. In this case, the pulse generator 5 selects a pulse-modulated signal and the voltage of the detected signal of this sample is registered with a null-indicator 8 with a compensator, the compensating voltage of the compensator achieves a zero indication of the zero-indicator 8. from the measuring generator With the help of the pulse converter 5, the sample is again sampled, but now from the signal of continuous oscillations and the voltage detected th signal r oorki this register zero in.idkat rum compensator. Now, by adjusting the level of the voltage of continuous oscillations, the zero indication of the zero indicator 8 is set. the pulse from the output of the generator of control pulses 7 can be sampled from a pulse-modulated signal in any part of the radio impulse,

The error of calibration and calibration is determined by the error of the pulse converter 5 and the error of the reference voltmeter of sinusoidal oscillations 4. Since the frequency of the signal of continuous: oscillations is equal to the frequency of filling the signal of the pulse-modulated oscillations, the same duration

, samples of both signals, as well as o;: the same amplitude of the voltage of the samples at the input of the pulse converter 5, then the pulse. the transducer introduces only negligible random measurement error caused by instability of its circuit elements and noise. Therefore, the error of calibration and calibration of voltmeters using this device is mainly determined by the error of the reference voltmeter of the sinusoidal oscillations, which is an order of magnitude smaller than the error of the reference voltmeter.

SUBJECT OF INVENTION

A device for calibrating and calibrating voltmeters of pulsed modulated oscillations, containing a calibrated voltmeter connected to a transmission line loaded on a matched load,

characterized in that, in order to improve the accuracy of verification, it is equipped with a continuous sinusoidal oscillation voltmeter and a pulse converter made, for example, on semiconductor deodes, while the input of the sinusoidal voltmeter and oh, the qin of the pulse converter inputs are connected to

the cross section of the transmission line to which the calibrated voltmeter is connected; the second input of the pulse converter is connected to one of the outputs of the constant source

current and generator of control pulses; the third input of the pulse converter is connected to the second output of the DC source and the generator of control pulses; the output of the pulse sub-converter, is provided to the input zero-y, of the trimmer with a compensator.

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