File:Ferisol Catalogue 1972 Qmetre M803A.jpg
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English: The technology is that of the 1950s with active tube components. An oscillator (osc) generates a range of variable and calibrated frequencies. The selected frequency is injected across the terminals of a shunt: very low pure resistance (invariable depending on the frequency) of 0.04 ohm and an LC oscillating circuit placed in parallel. L is the choke whose overvoltage coefficient we want to measure.
If we know the voltage at the terminals of resistor R, we will measure with a very high impedance voltmeter, the voltage at the terminals of capacitor C (very high quality variable capacitor) The ratio between the two voltages will give the overvoltage coefficient: Q of the inductance L. The injection power is measured using a specific (and fragile) aperiodic component thermocouple (th), essential for the proper functioning of the Q-meter. The injection voltage appears directly, in the form of a coefficient to be applied to the measurement of Q, on the overvoltage microammeter. The overvoltage galvanometer is graduated in reading of Q, overvoltage value that can be read at the resonance of the LC circuit Inductance and capacitance measurements are made directly on dials calibrated and engraved individually with each device. According to the source: http://ferisol.free.fr/q-metre_ferisol.htmFrançais : La technologie est celle des années 1950 avec des composants actifs à tubes. Un oscillateur (osc) génère une gamme de fréquences variables et étalonnées. La fréquence sélectionnée est injectée aux bornes d'un shunt : Résistance pure très faible (invariable en fonction de la fréquence) de 0,04 ohm et d'un circuit oscillant LC placé en parallèle. L est la self dont on veut mesurer le cofficient de surtension.
Si l'on connaît la tension aux bornes de la résistance R, on mesurera avec un voltmètre à très haute impédance, la tension aux bornes du condensateur C (condensateur variable de très haute qualité) Le rapport entre les deux tensions donnera le coefficient de surtension : Q de l'inductance L. La puissance d'injection est mesurée à l'aide d'un thermocouple (th) composant apériodique spécifique (et fragile), capital dans le bon fonctionnement du Q-mètre. La tension d'injection apparaît directement, sous forme de coefficient à appliquer à la mesure de Q, sur le microampèremètre de surtension. Le galvanomètre de surtension est gradué en lecture de Q, valeur de surtension que l'on peut lire à la résonance du circuit LC Les mesures d'inductances et de capacité se font directement sur des cadrans étalonnés et gravés individuellement avec chaque appareil. D'après la source : http://ferisol.free.fr/q-metre_ferisol.htm |
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| Source | Own work |
| Author | Fil22plm |
| Camera location |  | View this and other nearby images on: OpenStreetMap |  |
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| current | 02:40, 12 November 2022 | | 2,971 × 3,561 (3.05 MB) | Fil22plm (talk | contribs) | Uploaded own work with UploadWizard |
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