Wata ce ake kira Vector Impedance Meter?

Mita ce Vector Impedance Meter?

Takaitaccen Vector Impedance Meter

Vector Impedance Meter yana nufin kayan aiki da ya kula ci gaba da amfani da zafi mai tsarki da kuma tushen alamar tsayi a cikin abubuwa na AC.

Ci Gaba da Amfani da Zafi Mai Tsarki da Kuma Tushen Alamar Tsayi

Yana ba da cikakken impedancen a harsuna na polar ta hanyar bincike drop-ba voltage a kan muhimmanci da kuma impedancen da ba a sanar da shi ba.

Hukumar Equal Deflection

Wani hukuma ne wanda yake da drop-ba voltage masu adadin sama a kan muhimmanci mai sarrafa da kuma impedancen da ba a sanar da shi ba don samun balancin impedancen.

An sanya muhimmanci biyu da adadin sama. Drop-ba voltage a kan RAB shine EAB, kuma drop-ba voltage a kan RBC shine EBC. Duka ma'adoton suna daga cikin adadin sama, kuma suka dace da adadin miliyan input (EAC).

An sanya muhimmanci mai sarrafa (RST) a kan seri da impedancen (ZX) da za su iya samun balancinsa.Hukumar equal deflection yana amfani a matsayin hukumar da ake amfani don samun gaba da amfani da zafi mai tsarki da kuma tushen alamar tsayi.

Wannan ya faru ne ta hanyar samun drop-ba voltage masu adadin sama a kan muhimmanci mai sarrafa da kuma impedancen (EAD = ECD) kuma bincike muhimmancin mai sarrafa (RST) da ya kamata a yi wannan halin.

Alamar tsayin impedancen (θ) zai iya samun ita ta hanyar karatu drop-ba voltage a kan BD. Wannan shine EBD.Zamantakewa meter zai canzawa ta hanyar Q factor (quality factor) da ya kamata a yi impedancen da ba a sanar da shi ba.

Vacuum Tube Voltmeter (VTVM) yana karatu AC voltage daga 0V zuwa balancin miliyansa. Idan karatu voltage ya dace da 0, Q value ya dace da 0, kuma alamar tsayi ya dace da 0 digiri.Idan karatu voltage ya dace da balancin miliyansa, Q value zai dace da infinity, kuma alamar tsayi zai dace da 90o.

Alamar da ke EAB da EAD zai dace da θ/2 (na'urar alamar tsayi). Saboda EAD = EDC.

A maimakon cewa drop-ba voltage a kan A da B (EAB) zai dace da na'urar drop-ba voltage a kan A da C (EAC wanda yake input voltage), karatu voltmeter, EDB zai iya samun ita ta hanyar θ/2. Saboda haka, θ (alamar tsayi) zai iya samun ita. Diagramma vector ta shafu a nan.

Don samun na'urar da kuma alamar tsayin impedancen, wannan hukuma yana da kyau. Don samun inganci a matsayin, ana iya amfani da vector impedance meter na commercial.

Commercial Vector Impedance Meter

Commercial Vector Impedance Meter yana ci gaba da amfani da zafi mai tsarki da kuma tushen alamar tsayi a harsuna na polar, ta hanyar kontrol biyu don samun gaba da amfani da zafi mai tsarki da kuma tushen alamar tsayi.

Wannan hukuma yana iya amfani don samun kowane gabashin resistance (R), Capacitance (C), da kuma Inductance (L). A wajen haka, yana iya ci gaba da amfani da impedancen masu wasu da ba sauran da elementoci (C, L, ko R).

Masu fadada a cikin bridge circuits na sadarwa kamar sarrafa manya da kuma koyarwa babban, suna daɗe a nan. Ingantaccen measurements da impedancen yana dace da 0.5 zuwa 100,000Ω a lokacin da external oscillator yana bayar supply a cikin frequency range 30 Hz zuwa 40 kHz.

A nan, meter yana haɓaka frequencies of 1 kHz, 400 Hz, ko 60 Hz, da kuma externally up to 20 kHz. Yana ci gaba da amfani da impedance ta hanyar accuracy of ±1% for magnitude and ±2% for phase angle.

Diagramma circuit don samun gaba da amfani da zafi mai tsarki ta shafu a nan.

A nan, RX shine muhimmanci mai sarrafa, kuma zai iya yin lissafi da dial na impedancen.

Drop-ba voltage biyu na muhimmanci mai sarrafa da kuma impedancen (ZX) suna da adadin sama ta hanyar yin lissafi da dial. Duka drop-ba voltage suna haɓaka ta hanyar two modules of balanced amplifiers.

Wannan an ba section na dual rectifier. A nan, arithmetic sum na outputs na rectifier zai dace da 0, kuma zai shahara a indicating meter. Saboda haka, impedancen da ba a sanar da shi ba zai iya samun ita daga dial na muhimmanci mai sarrafa.

Sannan, za a iya samun alamar tsayi a nan. A farkon zamani, switch zai set a calibration position, kuma voltage injected zai calibrate.Wannan ya faru ne ta hanyar set ita don samun full-scale deflection a VTVM ko indicating meter.

Sannan, function switch zai set a phase position. A nan, function switch zai make output of the balanced amplifier parallel before going to rectification.

Daga baya, sum total of the AC voltages which is from the amplifiers is definitely a function of the vector difference among the AC voltages on the amplifiers.

Voltage that is rectified as a result of this vector difference is indicated in the indicating meter or DC VTVM. This is actually the measure of the phase angle between the voltage drop across the unknown impedance and variable resistor.

These voltage drops will be the same in magnitude but the phase is different. Hence, the phase angle is obtained by direct reading from this instrument.The quality factor and dissipation factor can also be calculated from this phase angle if needed.

Diagramma circuit don samun alamar tsayi (θ) ta shafu a nan.

Applications and Benefits

Amfani da ita don ci gaba da amfani da impedancen masu wasu, kuma yana haɗaƙar da need for multiple adjustments.