  We study the variability of the quasar HS 1946+7658 on intra-night time scale
based on both our own optical and archival X-ray data. We find the quasar
non-variable during about 11 hours of optical monitoring. This is in accordance
with the low intra-night variability duty cycle of radio-quiet quasars.
Regarding the X-rays, we cannot make a firm conclusion about the quasar
variability owing to the controversial results of the light curves statistical
analysis. In addition, we calibrated Johnson-Cousins $BVRI$ magnitudes of 7
field stars that are to be used as secondary standards.
