| 摘要 |
PCT No. PCT/FI87/00156 Sec. 371 Date Jun. 23, 1989 Sec. 102(e) Date Jun. 23, 1989 PCT Filed Nov. 18, 1987 PCT Pub. No. WO88/04113 PCT Pub. Date Jun. 2, 1988.A procedure and an apparatus for producing an a.c. voltage, in which procedure the a.c. voltage (uo) is produced via inversion from a d.c. voltage (UA). The d.c. voltage (UA) is produced by a generator (4). Moreover, the d.c. voltage (UA) is measured and stabilized. The frequency of the a.c. voltage is determined by means of an oscillator (9).
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