SU1635150A2 - Device for calibration of levels of shf signals - Google Patents

Abstract

The invention relates to electrical measuring equipment and can be used for the calibration and calibration of voltmeters and generators. The purpose of the invention is to improve the accuracy of setting the output level of the output signal in the dynamic and frequency range by separating the error signal due to the finite strobe pulse duration. a phase shifter 13, a strobe pulse shaper 14, a strobe converter 15. a voltage divider 17 into two, a substrate 10. The device also includes a frequency generator 1, attenuators 2. 4, 9, 19, voltmeters 3.20, supports first oscillator 6, the block 5 stabilization intermediate frequency generator 7 strobe pulses strobe converter 8, an intermediate frequency filter 18 1 yl. Yo

Description

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The invention relates to electrical measuring equipment and can be used to calibrate and check voltmeters and generators.

The purpose of the invention is to improve the accuracy of calibration by the level of the output voltage, which is achieved by compensating for the error by the known method of summing and dividing the voltages of two measuring channels.

The drawing shows a block diagram of a device for calibrating high-frequency signal levels.

The device contains a frequency generator 1, attenuator 2, exemplary voltmeter 3, attenuator 4, intermediate frequency stabilization unit 5, reference generator 6, shaper pulse generator 7 gtrobpp-converter 8, attenuator 9, substrate 10, intermediate frequency stabilizer 12 , phase shifter 13, shaper 14, pulse generator, strobe converter 15, attenuator 16, voltage divider 17 by two, intermediate frequency filter 18, attenuator 19, voltmeter 20

In the device for czg.byvki levels of high-frequency signals, the output of the generator 1 frequency connected by the input of attenuator 2, connected by an output to an exemplary voltmeter 3. the output of the device, the inputs of attenuators 9 and 16, the outputs of attenuators 4 and 11 are connected to the first inputs of blocks 5 and 12 frequencies, respectively, and the second input of the intermediate frequency stabilization unit 5 is connected to the output of the reference generator 6 and the input of the phase rotator i3, the output of which is connected to the second input of the stabilization unit 12 intermediate the frequencies, the outputs of the 5, 12 stabilization blocks of the intermediate frequency are connected to the second inputs of the strobe converters 8 and 15 through the drivers 7, 14 strobe pulses, respectively, and the first inputs of the converter are, respectively, connected to the outputs of attenuator 9 and 16, the output of the strobe converter 8 is connected to the first input of the strap extractor 10 is the second input of which is connected to the output of the strobe pre-lazovagel 15, and the output is the black voltage divider 17, the intermediate frequency filter 1C, the attenuator 13 is connected to the input of the voltmeter 20.

Intermediate-frequency stabilization blocks are systems of a pulse-phase auto-frequency control using strobe transforms.

The intermediate frequency voltmeter 20 is a phase meter,

The device operates as follows. At the first stage, the signal from the output of the 1 frequency generator is fed to the input of the attenuator 2. With a minimum attenuation of this attenuator, the output voltage of the UHOM device is set at an output voltmeter 3 at the output of the device. Exemplary Voltmeter 3 measures high level

5 harmonic signal and has a high

measurement accuracy because nonlinearity

amplitude response model

the voltmeter has little effect.

Device output with level,

0 equal to the UHOM through attenuators 2.4, 11, 16 is fed to the inputs of strobe converters 8, 15 and blocks 5 and 12 of stabilization of the intermediate frequency,

Strobe converters 8 and 15 level UHOM is transferred from high frequency to a signal of a fixed low intermediate frequency fn i Reference generator 6 and frequency stabilization blocks provide a fixed value and stability of fen (equal to 100 kHz), which is necessary for operation of a high-precision phase voltmeter 20 Over the account of the presence of the phase shifter 13 at 180 ° signal from the output of the strobe transform - THR 15 is in protopophase to the signal

5 from the output of the inverter 8 At the same t, the parasitic additive to the voltage of the frequency AU, which occurs with a high degree of signal steepness during the duration of the strobe pulse, has the same sign in both channels R of the substratector, 10 output signals of both of the strobe converters subtracted by the AU library (-UHOM DU) 2UHOM.

5 The voltage divider 17 leads the output voltage of the subtractor to the UHOM value which is supplied through the filter 18 and the attenuator 19 to the voltmeter 20. On the indicator of the voltmeter 20, an attenuator 19 is set using the attenuator 19 This completes the first stage

The use of strobe converters allowed to eliminate the error in the readings

5 an exemplary voltmeter that occurs when using other methods of frequency conversion due to the parasitic passage of signals Gates that passed to the output of the device have no effect

the indications of the reference voltmeter and the load of the device, since their frequency is much less than the frequency of the output signal, and their duration rs is 0.

The proposed device allows operating in a wider frequency range (raising the upper frequency limit, no error in the dynamic range at a fixed output frequency (no error due to the finite pulse duration), does not allow the DHOM level to be set on a standard voltmeter when changing ± 20% output frequency

Claims (1)

The invention is a device for calibrating the levels of high-frequency and microwave signals by aut. St. Ns 769462. characterized in that, in order to improve the accuracy of setting the output voltage, the third and fourth attenuators, the second strobe converter and the strobe pulse shaper, the second intermediate frequency stabilization unit, the phase shifter on 180 °, the subtractor, the voltage divider nc two, with the output of the first strobe transducer connected to the first input of the substrate, and the output of the frequency generator through the third attenuator is connected to the first the input of the second stabilization block of the intermediate frequency, the output of which is connected to the second input of the second strobe converter via the second strobe pulse generator, and the second input through 180 ° phase shifter is connected to the output of the reference generator, the first input of the second strobe transducer is connected to the device output via the fourth attenuator, and the output is connected to the second input subtractor, the output of which is through a divider. a voltage of two is connected to the input of the intermediate frequency filter