SU911370A1 - Device for measuring four-terminal network gain - Google Patents

Description

I: The invention relates to radio measurements and can be used to measure the gain of the microwave equipment.

 Devices for measuring the four-port gain are known.

One of the known devices for measuring the gain of a microwave quadrupole by the replacement method comprises a signal generator, a calibrated attenuator, a measurement of a quadrupole i detector head, and an indicator 1.

A disadvantage of the known device is. low measurement accuracy of the quadrupole transducer gain factor - Frequency due to uneven sensitivity of the head in the range of input and output frequencies of the transducer.

The closest technical solution to this invention is a device for measuring the gain of a microwave four-port network, comprising a signal generator, a calibrated attenuator, input and output switches, a measured four-terminal network, a detector head, and an indicator C21.

A disadvantage of the known device is low measurement accuracy of quadrupole frequency converters.

The purpose of the invention is to improve the accuracy in measuring the gain of frequency converters.

The goal is achieved by the fact that in a device for measuring the gain of a quadrupole,

Claims (2)

15 containing a signal generator, a calibrated attenuator, an input and output switch, a measured quadruple switch connected between the first output of the input switch 20 bodies and the first input of the output switch, a detector head connected to the output of the output switch, a gain factor indicator39, a frequency converter and a meter are entered the power level of the input and output frequency signals, and the frequency converter is switched on between the second output of the input switch, and the second input of the output switch Attic, the power level meter is connected to the second output of the output switch calibrated Atta nyuator connected between the output of the signal generator and the input of the input pen breakers. Figure 1 shows the block diagram of the device during calibration; in fig. 2-, block diagram when measuring. A device for measuring the gain of quadrupoles, contains a signal generator 1, a calibrated attenuator 2, an input switch 3, a measured four-port microwave converter 4, a frequency converter 5, an output switch 6, a detector head 7, a gain indicator 8, a power level meter 9, From switch 10, the sensor P of the power level of the output frequency signal and the indicator 13 of the power level. The device works as follows. For detecting and eliminating the hidden systematic error of the cG measurement of the gain of the pair - -. inverters due to uneven sensitivity of the detector head in the range of input and output frequencies, it is necessary to calibrate the device in the range of input and output and output uj (s frequencies., Cal center of the device at the input frequency and connect generator 1, attenuator 2 and power meter 9 with sensor 11c using switches 3 and 6 to the measuring channel (there is no measured quadrupole transducer); set the level of power P Q w with attenuator 2, fix the reading attenuator a ,, dB; turn off the power meter 9 from the measuring channel with the help of switch 6 and connect the detector head 7 and the indicator 8. Adjusting the attenuator 2 attenuation, align the arrow or level of the indicator 8 with the sight, fix the reading of the attenuator arj, dB and determine the difference tu 1 a 1-a For calibrating the device, an oscillator 1 is connected at the output frequency, an attenuator 2 and a power meter 9 with sensor 12 using switches 3 and b to the frequency conversion channel; using the attenuator 2, set the power level P о (.Wij) Po () and fix the attenuator reading - aa, dB; Turn off the power meter 9 from the frequency conversion channel with the help of the switch 6 and connect the detector head 7 and the inverter 8. Adjust the attenuation of the attenuator 2, combine the arrow or the level of the indicator 8 with the sight, fix the reading of the attenuator a, dB, determine the difference A (j. /, dB and concealment the systematic error I.a1-1m1, .Dn measuring the gain of a low-noise microwave quadrupole converter include measuring its fourframe converter 4 into the measuring channel; connect using switch 3 and 6 generator 1, attenuator 2, detector head 7 and indicator 8 to the measuring channel Adjusting the attenuation of the attenuator 2, align the arrow or level of the indicator 8 with the sight and fix the reading of the attenuator 2 - gsTchLTttch f / CH dB. Determine the gain, ag-DV, with calibration, where () U (it and (-C (b)), when (j .. The proposed device for measuring the gain of low-noise microwave quadrupole converters allows you to detect and ycTpaifflTb latent systematic error measured caused by the uneven sensitivity of the detector head in the range of input and output frequencies of the measured microwave quadrupole converter and was more than 2-4 dB at transmitted input and output frequencies of more than 6-10 octaves, and thereby significantly improve the accuracy of measuring the gain . . Claims of Invention A device for measuring the gain of a four-port network. 5 contains a signal generator, a calibrated attenuator, an input and output switch, a measured quadrupole connected between the first output of the input switch and the first input of the output switch, a detector head connected to the output of the output switch, a gain indicator, characterized in that Accuracy in measuring the gain of the frequency converters, the device includes a frequency converter and a power meter for the input and output clock signals from,. / 06 than the frequency converter is connected between the second output of the input switch and the second input of the output switch, the power level meter is connected to the second output of the output switch, the calibrated attenuator is connected between the output of the signal generator and the input of the input switch. Sources of information taken into account in the examination. I. Rynzton, E.L., Measurements on centimeter waves. I., Foreign literature, I960, p. 570-572. 2. The patent of Germany 1.541.840, class, 21 e 27/28, 1974 (prototype). .