SU729525A1 - Vector measuring device - Google Patents

Description

one

The invention relates to a measurement technique and can be used in devices for determining the unbalance vector of rotors. and in measuring amplitude-phase-frequency characteristics.

Devices are known for determining the parameters of a vector in which a mechanically variable resistance 1 is used as a block of onopHbix signals.

The presence of a variable resistance limits the upper frequency range of the studied frequencies, and the friction of the slider contacts during rotation reduces the reliability of the device.

The closest to the technical essence of the invention is a vectromere device comprising an integral frequency generator, the output of which is set to a 90 ° phase shifter, a modulator, a frequency multiplier, two synchronous detectors, two filters, a recorder, and a reference alternating voltage source to obtain a quadrature output 2

The presence of a broadband phase shifter at the output of a carrier frequency generator reduces the TOifflocTb device due to the impossibility of providing a 90 ° phase shift in a wide frequency band.

The aim of the invention is to improve the accuracy.

This is achieved by introducing a second frequency multiplier into the device, one of the inputs of which is connected to the output of the object under study, another through a phase shifter to the output of the reference voltage source, and the output of the second multiplier is connected to one of the inputs of the second synchronous detector, the other input of which Connected to the output of a frequency generator.

The drawing shows a block diagram of a vector meter ..

15

The device consists of a carrier frequency generator 1, a balanced modulator 2, the object under study 3, multipliers 4 and 5, synchronous detectors 6 and 7, low-pass filters 8 and 9, recorder 10, reference source 11

20 alternating voltage and phase shifter 12 at 90 °.

The vector device operates as follows. the reference voltage source 11 (fot) and the frequency from the generator 1 of the carrier frequency {sinwt) are mixed in the balanced modulator 2, and the signal of the difference frequency (sin ()) t sinSl.t) is fed to the input of the object under study 3. The voltage from the output object 3 (.Xi sin (in.t + 4) enriched with higher harmonics, where i is the harmonic number, Xj, C is the amplitude and phase of the i-th harmonic, is fed to the input of multiplier 4, its second input receives a signal from source 11 the reference voltage. The output of the multiplier 4 (ixisin (iftt + 4i) sin fotj is connected to one of the inputs of the synchronous detector 6, to its second input the voltage (s inw, of the carrier frequency generator 1. The output voltage of the detector 6 after filtering in filter 8 (XiSin.) is applied to one of the inputs of the recorder 10. fot. This signal is fed to the input y7 of the multiplier 5, the voltage from the object’s output is fed to the other input, the output 5 (2 sin (iSrt +4) cos fgt) is connected to one input of the synchronous detector 7, its second input also arrives voltage () generator 1 carrier frequency. The output voltage of the detector 7 after filtering in filter 9 (xcos0 is fed to another input of the recorder 10 .. Thus, the phase shifter can be tuned to a single fixed frequency by 90 °, i.e. there is no need for their broadband. This circumstance improve the accuracy of vector measurement and facilitate the adjustment of the entire system, which provides technology-: economic effect. Formula of the invention: Vector-dimensional device containing a carrier frequency generator, the output of which is connected to one of the modulator inputs and About the synchronous detector, the modulator output is connected to one of the inputs of the first frequency multiplier through the object under study, the output of which is connected to another input of the first synchronous detector, the output of which is connected to the recorder through the first filter, the reference alternating voltage source connected to other inputs of the modulator and the first multiplier, the second synchronous detector, the output of which is connected to the recorder through the second filter, the azovar by 90 °, which, in order to improve the accuracy, is entered into the device swarm frequency multiplier, one input of which is connected to the output of the test object and the other through the phase shifter -. to the output of the reference voltage source, and the output of the second multiplier is connected to one input of the second synchronous detector, another input of which is connected to the output of the carrier generator. Sources of information taken into account during the examination 1. USSR author's certificate No. 378034, cl. G 01 M 1/22, 1969. 2. USSR author's certificate No. 497534, cl. G 01 R 25/00, 1974.

Claims (2)

Claim A vector-dimensional device containing a carrier frequency generator, the output of which is connected to one of the inputs of the modulator and the first synchronous detector, the output of the modulator is connected to one of the inputs of the first frequency multiplier through the object under study, the output of which is connected to the other input of the first synchronous detector, the output of which is connected to the recorder through the first filter, the source of the reference AC voltage connected to other inputs of the modulator and the first multiplier, the second synchronous detector, the output of which is connected to the recorder through a second filter, a 90 ° phase shifter, characterized in that, in order to increase accuracy, a second frequency multiplier is introduced into the device, one of the inputs of which is connected to the output of the object under study., the other through a phase shifter - to the output of the reference voltage source, and the output of the second multiplier is connected to one of the inputs of the second synchronous detector, the other input of which is connected to the output of the carrier frequency generator. '' Sources of information taken into account in the examination 1. USSR Copyright Certificate No. 378034, cl. G 01 M 1/22, 1969. 2. USSR Copyright Certificate No. 497534, Subscription TSNIIIPI Order 1255/39 Circulation 1019 PPP ’’ Patent Branch, Uzhhorod, st. Project, 4