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Correlation of induced pick-up signal and scatter of measured pressure of a spinning rotor gaugeŠetina, JanezSpinning rotor gauge (SRG) measures pressure by determining the decay rate of the magnetically suspended rotor, which is caused by gas friction. The rotating magnetic moment of the spinning rotor ... induces in the pickup coils a periodic signal that is used to determine the rotational frequency of the rotor. Commercial SRG controllers provide a filtered and amplified output of the pickup signal that can be monitored with the oscilloscope. When the rotor is completely re-suspended (the suspension head is removed and remounted) the magnetic moment of the rotor takes a new random orientation and the induced pick-up signal changes. In the presented work we have studied, how does the strength of the induced pick-up voltage influence on the width of the statistical distribution of the measured pressure. For a larger number of renewed suspensions of a particular rotor we found a linear dependence of the width of the statistical distribution of pressure readings on the voltage of the induced pickup signal. Monitoring of the pickup signal can be useful for optimization of the operational conditions of the SRG. When a very low standard deviation of measured values is required, the pickup signal should be checked during initial operation of the gauge. If it is insufficient, the rotor may be resuspende. If the repeated suspensions still give unsatisfactorysignal voltage, the user may try to increase the signal by magnetizing the rotor. If all this were unsuccessful, we would recommend replacing such rotor with another one.Vrsta gradiva - prispevek na konferenciLeto - 2011Jezik - angleškiCOBISS.SI-ID - 868266
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Baze podatkov, v katerih je revija indeksirana
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Povezave do osebnih bibliografij avtorjev | Povezave do podatkov o raziskovalcih v sistemu SICRIS |
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Šetina, Janez | 04254 |
Vir: Osebne bibliografije
in: SICRIS
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