  We report on the results of an analysis in the X-ray band of a recent long
ASCA observation of NGC 4395, the most variable low-luminosity AGN known. A
relativistically-broadened iron line at ~6.4 keV is clearly resolved in the
time-averaged spectrum, with an equivalent width of 310^{+70}_{-90} eV.
Time-resolved spectral analysis of the heavily absorbed soft X-ray band
confirms the existence of a variable, multi-zone warm absorber in this source,
as proposed in a previous analysis of a shorter ASCA observation. The light
curve of the source is wildly variable on timescales of hours or less, and a
factor of nearly 10 change in count-rate was recorded in a period of less than
2000 s. The long observation and variability of the source allowed the power
density spectrum (PDS) to be constructed to an unprecedented level of detail.
There is evidence for a break in the PDS from a slope of \alpha~1 to \alpha~1.8
at a frequency of around 3 \times 10^{-4} Hz. The central black hole mass of
NGC 4395 is estimated to be approximately 10^4-10^5 solar masses using the
break in the PDS, a result consistent with previous analyses using optical and
kinematical techniques.
