| 摘要 |
<p>The device disclosed comprises a tachometric generator (G) with a rotary collector and brushes, and a circuit for maintaining the measurement voltage (Uc) during accidental interruptions of the latter due to a faulty contact between brushes and collector. The maintenance circuit comprises a capacitor (C1) connected in series with the internal resistance (Ri) of the generator and a measurement circuit (A2) with very high impedance input, in such a way that the pass-band for the tachometric signal extends to an upper limiting frequency equal to or greater than 1 kHz, while remaining free of parasites due to interrupted contact.</p> |
